{"id":2319,"date":"2019-12-25T12:00:23","date_gmt":"2019-12-25T03:00:23","guid":{"rendered":"https:\/\/www.bold.ne.jp\/engineer-club\/?p=2319"},"modified":"2025-11-19T09:56:56","modified_gmt":"2025-11-19T00:56:56","slug":"java-lambda-expression","status":"publish","type":"post","link":"https:\/\/www.bold.ne.jp\/engineer-club\/java-lambda-expression","title":{"rendered":"Java\u306e\u30e9\u30e0\u30c0\u5f0f\u3068\u306f\uff1f\u30e9\u30e0\u30c0\u5f0f\u306e\u30e1\u30ea\u30c3\u30c8\u3084\u4f7f\u3044\u65b9\u3092\u89e3\u8aac"},"content":{"rendered":"<p>Java\u306e\u30e9\u30e0\u30c0\u5f0f<span>(lambda expression)<\/span>\u3068\u306f\u3001<span style=\"text-decoration: underline;\">\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u3001\u3054\u304f\u77ed\u3044\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u91cf\u3067\u3068\u3066\u3082\u7c21\u5358\u306b\u4f5c\u308c\u3066\u3057\u307e\u3046\u6587\u6cd5<\/span>\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306f\u3001<span>Java 8<\/span>\u304b\u3089\u8ffd\u52a0\u3055\u308c\u305f\u6bd4\u8f03\u7684\u65b0\u3057\u3044\u6a5f\u80fd\u3067\u3059\u3002\u30e9\u30e0\u30c0\u5f0f\u3063\u3066\u305d\u3082\u305d\u3082\u4f55\u3060\u308d\u3046\u3068\u601d\u3063\u3066\u8abf\u3079\u308b\u3068\u3001\u5927\u62b5\u306f<span>Stream API<\/span>\u3068\u30bb\u30c3\u30c8\u3067\u306e\u8aac\u660e\u3067\u3001\u899a\u3048\u308b\u3053\u3068\u304c\u3082\u306e\u3059\u3054\u304f\u591a\u305d\u3046\u3067\u3059\u3088\u306d\u3002<\/p>\n<p>\u305d\u3093\u306a\u5370\u8c61\u304b\u3089\u3001<span>Java<\/span>\u306e\u30e9\u30e0\u30c0\u5f0f\u306b\u96e3\u3057\u3044\u5370\u8c61\u3092\u6301\u3063\u3066\u3044\u308b\u305d\u3053\u306e\u3042\u306a\u305f\u3001\u305d\u308c\u306f\u307e\u3063\u305f\u304f\u306e\u9593\u9055\u3044\u3067\u3059\u3002\u30e9\u30e0\u30c0\u5f0f\u305d\u306e\u3082\u306e\u306f\u3001\u30dd\u30a4\u30f3\u30c8\u3092\u62bc\u3055\u3048\u308c\u3070\u3001\u5b9f\u306f\u3082\u3063\u3068\u7c21\u5358\u306b\u5206\u304b\u308b\u3082\u306e\u306a\u306e\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<span>Java<\/span>\u306e\u30e9\u30e0\u30c0\u5f0f\u3068\u306f\u672c\u5f53\u306f\u3069\u3046\u3044\u3046\u3082\u306e\u304b\u3068\u3044\u3046\u8003\u3048\u65b9\u304b\u3089\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306e\u4f7f\u3044\u3069\u3053\u308d\u306a\u3069\u3092\u3001<span>Java<\/span>\u306e\u521d\u5fc3\u8005\u3084\u3001<span>Java<\/span>\u304b\u3089\u3057\u3070\u3089\u304f\u96e2\u308c\u3066\u3044\u305f\u4eba\u5411\u3051\u306b\u3001\u4e00\u3064\u305a\u3064\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<p>\u203b\u3053\u306e\u8a18\u4e8b\u306f<span>Java 13<\/span>\u6642\u70b9\u306e\u8a00\u8a9e\u4ed5\u69d8\u30fb<span>API<\/span>\u306b\u57fa\u3065\u3044\u3066\u3044\u307e\u3059\u3002\u30b5\u30f3\u30d7\u30eb\u306f<span>Java 13<\/span>\u306e\u74b0\u5883\u3067\u52d5\u4f5c\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">\u76ee\u6b21<\/p><ul class=\"toc_list\"><li><a href=\"#JAVA\">\uff11\uff0e\u3010JAVA\u3011\u30e9\u30e0\u30c0\u5f0f\u306e\u52d8\u6240<\/a><ul><li><a href=\"#i\">\uff11-\uff11\uff0e\u30e9\u30e0\u30c0\u5f0f\u306f\u30af\u30e9\u30b9\u5b9a\u7fa9\u3068\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u3092\u304a\u624b\u8efd\u306b\u3084\u308b\u6587\u6cd5<\/a><\/li><li><a href=\"#-1\">\uff11-\uff12\uff0e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306f\u3001\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u30921\u3064\u3060\u3051\u6301\u3064<\/a><\/li><li><a href=\"#i-2\">\uff11-\uff13\uff0e\u30e9\u30e0\u30c0\u5f0f\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u77ed\u304f\u3001\u5206\u304b\u308a\u3084\u3059\u304f\u306a\u308b<\/a><\/li><\/ul><\/li><li><a href=\"#JAVA-2\">\uff12\uff0e\u3010JAVA\u3011\u30af\u30e9\u30b9\u304c\u30e9\u30e0\u30c0\u5f0f\u306b\u306a\u308b\u307e\u3067<\/a><ul><li><a href=\"#i-3\">\uff12-\uff11\uff0e\u666e\u901a\u306e\u30af\u30e9\u30b9\u304b\u3089\u533f\u540d\u30af\u30e9\u30b9\u306b\u306a\u308b\u307e\u3067<\/a><\/li><li><a href=\"#i-4\">\uff12-\uff12\uff0e\u533f\u540d\u30af\u30e9\u30b9\u304c\u30e9\u30e0\u30c0\u5f0f\u306b\u306a\u308b\u307e\u3067<\/a><\/li><li><a href=\"#i-5\">\uff12-\uff13\uff0e\u30e9\u30e0\u30c0\u5f0f\u306f\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304c\u3042\u3063\u3066\u3053\u305d<\/a><\/li><li><a href=\"#i-6\">\uff12-\uff14\uff0e\u578b\u306f\u5f15\u6570\u3084\u623b\u308a\u5024\u306a\u3069\u304b\u3089\u3082\u5206\u304b\u308b<\/a><\/li><li><a href=\"#-Java\">\uff12-\uff15\uff0eJava\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u30e9\u30e0\u30c0\u5f0f\u3092\u3053\u3046\u898b\u3066\u3044\u308b<\/a><\/li><\/ul><\/li><li><a href=\"#JAVA-3\">\uff13\uff0e\u3010JAVA\u3011\u30e9\u30e0\u30c0\u5f0f\u306e\u304a\u7d04\u675f\u3044\u308d\u3044\u308d<\/a><ul><li><a href=\"#i-7\">\uff13-\uff11\uff0e\u30e9\u30e0\u30c0\u5f0f\u306e\u57fa\u672c\u5f62<\/a><\/li><li><a href=\"#i-8\">\uff13-\uff12\uff0e\u30e9\u30e0\u30c0\u5f0f\u306e\u4e2d\u3067\u4f7f\u3048\u308b\u5909\u6570<\/a><\/li><li><a href=\"#i-9\">\uff13-\uff13\uff0e\u30e9\u30e0\u30c0\u5f0f\u3068\u30aa\u30fc\u30c8\u30dc\u30af\u30b7\u30f3\u30b0\u30fb\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u62e1\u5927\u5909\u63db<\/a><\/li><li><a href=\"#i-10\">\uff13-\uff14\uff0e\u30e9\u30e0\u30c0\u5f0f\u3068\u4f8b\u5916<\/a><\/li><li><a href=\"#i-11\">\uff13-\uff15\uff0e\u30e9\u30e0\u30c0\u5f0f\u3068\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7<\/a><\/li><\/ul><\/li><li><a href=\"#JAVA-4\">\uff14\uff0e\u3010JAVA\u3011\u30e9\u30e0\u30c0\u5f0f\u306e\u4f7f\u308f\u308c\u65b9<\/a><ul><li><a href=\"#-Stream_API\">\uff14-\uff11\uff0eStream API\u306e\u5f15\u6570<\/a><\/li><li><a href=\"#-APIRunnableCallable\">\uff14-\uff12\uff0e\u30b9\u30ec\u30c3\u30c9\u95a2\u9023API\u3067\u306eRunnable\/Callable<\/a><\/li><li><a href=\"#i-12\">\uff14-\uff13\uff0e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u52d5\u4f5c\u30ab\u30b9\u30bf\u30de\u30a4\u30ba<\/a><\/li><li><a href=\"#i-13\">\uff14-\uff14\uff0e\u305d\u306e\u4ed6\u306e\u4f7f\u308f\u308c\u65b9<\/a><\/li><\/ul><\/li><li><a href=\"#i-14\">\uff15\uff0e\u3010\u767a\u5c55\u3011\u30e9\u30e0\u30c0\u5f0f\u30fb\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3068\u90e8\u54c1\u5316\u306e\u8003\u3048\u65b9<\/a><ul><li><a href=\"#i-15\">\uff15-\uff11\uff0e\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308b\u90e8\u54c1\u5316<\/a><\/li><li><a href=\"#i-16\">\uff15-\uff12\uff0e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306b\u3088\u308b\u90e8\u54c1\u5316<\/a><\/li><li><a href=\"#i-17\">\uff15-\uff13\uff0e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306a\u3089\u51e6\u7406\u3092\u5dee\u3057\u66ff\u3048\u3067\u304d\u308b<\/a><\/li><li><a href=\"#-Java-2\">\uff15-\uff14\uff0eJava\u3067\u306e\u95a2\u6570\u306f\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9<\/a><\/li><li><a href=\"#i-18\">\uff15-\uff15\uff0e\u30e9\u30e0\u30c0\u5f0f\u304c\u95a2\u6570\u3092\u4f5c\u308b\u30cf\u30fc\u30c9\u30eb\u3092\u4e0b\u3052\u308b<\/a><\/li><\/ul><\/li><li><a href=\"#i-19\">\uff16\uff0e\u307e\u3068\u3081<\/a><\/li><\/ul><\/div>\n<h2><span id=\"JAVA\">\uff11\uff0e\u3010JAVA\u3011\u30e9\u30e0\u30c0\u5f0f\u306e\u52d8\u6240<\/span><\/h2>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001\u307e\u305a\u306f\u7686\u3055\u3093\u306b\u30e9\u30e0\u30c0\u5f0f\u306e\u672c\u5f53\u306e\u52d8\u6240\u3092\u77e5\u3063\u3066\u3044\u305f\u3060\u304d\u307e\u3059\u3002\u3082\u3046\u305d\u308c\u306f\u3070\u3063\u3061\u308a\u5206\u304b\u3063\u3066\u3044\u308b\u3088\u3001\u3068\u3044\u3046\u65b9\u306f\u300c<span>3.<\/span>\u30e9\u30e0\u30c0\u5f0f\u306e\u304a\u7d04\u675f\u3044\u308d\u3044\u308d\u300d\u4ee5\u964d\u3092\u304a\u8aad\u307f\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u30e9\u30e0\u30c0\u5f0f\u3078\u3088\u304f\u3055\u308c\u308b\u3061\u3087\u3063\u3068\u5206\u304b\u308a\u3065\u3089\u3044\u8aac\u660e\u3001\u4f8b\u3048\u3070\u300c\u95a2\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u300d\u300c\u30e1\u30bd\u30c3\u30c9\u3092\u5909\u6570\u306e\u3088\u3046\u306b\u6271\u3048\u308b\u300d\u306a\u3069\u306f\u3001\u4e00\u65e6\u5fd8\u308c\u307e\u3057\u3087\u3046\u3002\u3053\u306e\u8a18\u4e8b\u3092\u6700\u521d\u304b\u3089\u7d20\u76f4\u306b\u8aad\u3093\u3067\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3068\u305d\u308c\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u3068\u3044\u3046\u3001<span>Java<\/span>\u3067\u306e\u3054\u304f\u57fa\u672c\u7684\u306a\u4e8b\u67c4\u3002\u305d\u308c\u3060\u3051\u5206\u304b\u3063\u3066\u3044\u308c\u3070\u3001<span>Java<\/span>\u306e\u30e9\u30e0\u30c0\u5f0f\u306f\u305d\u3053\u304b\u3089\u8003\u3048\u65b9\u3092\u5c11\u3057\u767a\u5c55\u3055\u305b\u308b\u3060\u3051\u3067\u7406\u89e3\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n<h3><span id=\"i\">\uff11-\uff11\uff0e\u30e9\u30e0\u30c0\u5f0f\u306f\u30af\u30e9\u30b9\u5b9a\u7fa9\u3068\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u3092\u304a\u624b\u8efd\u306b\u3084\u308b\u6587\u6cd5<\/span><\/h3>\n<p>Java\u306e\u30e9\u30e0\u30c0\u5f0f\u306f\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u3001\u7c21\u5358\u306b\u4f5c\u308b\u305f\u3081\u306e\u6587\u6cd5\u3067\u3059\u3002\u8a00\u3044\u63db\u3048\u308c\u3070\u3001\u30af\u30e9\u30b9\u306e\u5ba3\u8a00\u3068\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u751f\u6210\u3092\u540c\u6642\u306b\u884c\u3046\u6587\u6cd5\u306a\u306e\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3001\u4f55\u304b\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u304c\u3042\u308a\u3001\u305d\u306e\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3057\u3066\u4f7f\u3044\u305f\u3044\u3068\u3057\u307e\u3059\u3002\u3053\u3053\u3067\u306e\u4f8b\u3067\u306f\u3001<span>java.util.Comparator<\/span>\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Comparator;\r\n\r\nclass ComparatorImpl implements Comparator&lt;String&gt; {\r\n    public int compare(String s1, String s2) {\r\n        return s1.compareTo(s2);\r\n    }\r\n}<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Comparator;\r\n\r\nclass ComparatorImplTest {\r\n    public static void main(String[] args) {\r\n        Comparator&lt;String&gt; c = new ComparatorImpl();\r\n        System.out.println(c.compare(\"ABC\", \"DEF\")); \/\/ \u2192 -1\u304c\u8868\u793a\u3055\u308c\u308b\r\n    }\r\n}<\/pre>\n<p>\u3053\u308c\u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b<span>1<\/span>\u884c\u3067\u66f8\u3051\u307e\u3059\u3002\u30e9\u30e0\u30c0\u5f0f\u306f\u300c<span>(s1, s2) -&gt; s1.compareTo(s2)<\/span>\u300d\u306e\u90e8\u5206\u3067\u3059\u3002\u6700\u521d\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3068\u540c\u3058\u3088\u3046\u306b\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304c\u6301\u3064\u30e1\u30bd\u30c3\u30c9<span>compare<\/span>\u304c\u547c\u3079\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Comparator;\r\n\r\nclass ComparatorImplTest {\r\n    public static void main(String[] args) {\r\n        Comparator&lt;String&gt; c = (s1, s2) -&gt; s1.compareTo(s2);\r\n        System.out.println(c.compare(\"ABC\", \"DEF\"));\r\n    }\r\n}<\/pre>\n<p>Java\u306e\u30e9\u30e0\u30c0\u5f0f\u306f\u3001\u672c\u8cea\u7684\u306b\u306f\u3053\u308c\u3060\u3051<span>!! <\/span>\u540d\u7121\u3057\u306e\u30af\u30e9\u30b9\u3092\u5b9a\u7fa9\u3057\u3001\u305d\u306e\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3059\u308b\u3082\u306e\u3067\u3059\u3002\u66f8\u304d\u65b9\u306e\u304a\u4f5c\u6cd5\u3084\u5236\u9650\u4e8b\u9805\u304c\u5c11\u3005\u3042\u308a\u306f\u3057\u307e\u3059\u304c\u3001\u305d\u308c\u306f\u4e8c\u306e\u6b21\u3067\u3059\u3002<\/p>\n<p>\u672c\u6765\u306f\u8907\u6570\u884c\u3067\u884c\u3046\u30af\u30e9\u30b9\u306e\u5b9a\u7fa9\u304c\u3001\u306a\u305c\u305f\u3063\u305f<span>1<\/span>\u884c\u306b\u3067\u304d\u308b\u306e\u304b\u3002\u305d\u306e\u7406\u7531\u306f\u3071\u3063\u3068\u898b\u3067\u306f\u5206\u304b\u3089\u306a\u3044\u3067\u3059\u3088\u306d\u3002\u3053\u306e\u8a18\u4e8b\u306e\u7d9a\u304d\u3067\u306f\u3001\u305d\u306e\u4ed5\u7d44\u307f\u3092\u3057\u3063\u304b\u308a\u3068\u8aac\u660e\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3><span id=\"-1\">\uff11-\uff12\uff0e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306f\u3001\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092<span>1<\/span>\u3064\u3060\u3051\u6301\u3064<\/span><\/h3>\n<p>\u524d\u306e\u7bc0\u3067\u306f\u300c\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u300d\u3068\u3044\u3046\u7528\u8a9e\u3092\u3044\u304d\u306a\u308a\u4f7f\u3044\u307e\u3057\u305f\u3002\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9<span>(functional interface)<\/span>\u3068\u306f\u3001\u300c\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092<span>1<\/span>\u3064\u3060\u3051\u6301\u3064\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u300d\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u30e9\u30e0\u30c0\u5f0f\u3092\u5b66\u3076\u4e0a\u3067\u7d76\u5bfe\u306b\u5fd8\u308c\u3066\u306f\u306a\u3089\u306a\u3044\u306e\u306f\u3001\u3053\u306e\u300c<span>1<\/span>\u3064\u3060\u3051\u300d\u3068\u3044\u3046\u3068\u3053\u308d\u3002\u3053\u306e\u7279\u5fb4\u304c\u30e9\u30e0\u30c0\u5f0f\u306e\u7406\u89e3\u306b\u306f\u5fc5\u9808\u3001\u304b\u3064\u30e9\u30e0\u30c0\u5f0f\u3068\u306f\u4e0d\u53ef\u5206\u306a\u306e\u3067\u3059\u3002\u305d\u306e\u7406\u7531\u306f\u5f8c\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<p>\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3068\u3057\u3066\u306f\u3001\u4f8b\u3048\u3070\u6a19\u6e96<span>API<\/span>\u3067\u306f\u4ee5\u4e0b\u306e\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u306b\u3001\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u304c<span>1<\/span>\u3064\u3060\u3051\u3042\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306b\u904e\u304e\u307e\u305b\u3093\u304b\u3089\u3001\u81ea\u5206\u3067\u4f5c\u308b\u3053\u3068\u3082\u5f53\u7136\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n<blockquote>\n<p>java.lang.Comparable<\/p>\n<p>java.lang.Runnable<\/p>\n<p>java.util.Comparator<\/p>\n<p>java.util.concurrent.Callable<\/p>\n<p>java.util.function.Consumer<\/p>\n<p>java.util.function.Function<\/p>\n<p>java.util.function.Predicate<\/p>\n<p>java.util.function.Supplier<\/p>\n<p>\u2026\u306a\u3069\u591a\u6570<\/p>\n<\/blockquote>\n<p>\u3061\u306a\u307f\u306b\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306b\u95a2\u9023\u3059\u308b\u6587\u7ae0\u3067\u306f\u3001\u3044\u308d\u3044\u308d\u306a\u3068\u3053\u308d\u3067<span>SAM(<\/span>\u30b5\u30e0<span>)<\/span>\u304c\u51fa\u3066\u304d\u307e\u3059\u3002<span>SAM<\/span>\u306f\u300c<span>Single Abstract Method<\/span>\u300d\u306e\u7565\u3067\u3001\u300c<span>1<\/span>\u3064\u3060\u3051\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u300d\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<h4>\uff11-\uff12-\uff11\uff0e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u4f8b<span>:Runnable<\/span>\u3068<span>Comparator<\/span><\/h4>\n<p>\u3053\u3053\u3067\u306f\u3001<span>java.Runnable<\/span>\u3068<span>java.util.Comparator<\/span>\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u5b9a\u7fa9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u3053\u308c\u3089\u306f<span>Java 13<\/span>\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u304b\u3089\u6301\u3063\u3066\u304d\u3066\u3001<span>Javadoc<\/span>\u90e8\u5206\u306a\u3069\u3092\u524a\u9664\u3057\u305f\u3082\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">package java.lang;\r\n\r\n@FunctionalInterface\r\npublic interface Runnable {\r\n    public abstract void run(); \/\/ \u2190\u3053\u308c\u304cRunnable\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\r\n}<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">package java.util;\r\n\r\n\u203bimport\u6587\u306f\u7701\u7565\r\n\r\n@FunctionalInterface\r\npublic interface Comparator&lt;T&gt; {\r\n    int compare(T o1, T o2); \/\/ \u2190\u3053\u308c\u304cComparator\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\r\n\r\n    boolean equals(Object obj);\r\n\r\n    default Comparator&lt;T&gt; reversed() {\r\n        return Collections.reverseOrder(this);\r\n    }\r\n\r\n    \u203b\u4ee5\u4e0b\u3001default\/static\u30e1\u30bd\u30c3\u30c9\u306e\u5ba3\u8a00\u304c\u305a\u3063\u3068\u7d9a\u304f\u2026\r\n}<\/pre>\n<p>\u305d\u308c\u305e\u308c\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306f\u4e00\u3064\u3060\u3051\u3067\u3059<span>(run<\/span>\u3068<span>compare)<\/span>\u3002\u305f\u3060\u3001<span>Comparator<\/span>\u306b\u306f<span>Object<\/span>\u306e\u30e1\u30bd\u30c3\u30c9<span>(equals)<\/span>\u3001\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u4ee5\u5916\u306e\u30e1\u30bd\u30c3\u30c9<span>(static<\/span>\u30e1\u30bd\u30c3\u30c9\u3001<span>default<\/span>\u30e1\u30bd\u30c3\u30c9<span>)<\/span>\u304c\u3042\u308a\u307e\u3059\u3002\u3067\u3082\u3001\u3053\u308c\u3089\u306f\u4eca\u306f\u7121\u8996\u3057\u3066\u69cb\u3044\u307e\u305b\u3093\u3002<\/p>\n<h3><span id=\"i-2\">\uff11-\uff13\uff0e\u30e9\u30e0\u30c0\u5f0f\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u77ed\u304f\u3001\u5206\u304b\u308a\u3084\u3059\u304f\u306a\u308b<\/span><\/h3>\n<p>\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u3046\u3068\u3046\u308c\u3057\u3044\u306e\u306f\u3001\u4ee5\u4e0b\u304c\u540c\u6642\u306b\u5b9f\u73fe\u3067\u304d\u308b\u3053\u3068\u3067\u3059\u3002\u3044\u305a\u308c\u3082\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u8aad\u307f\u3084\u3059\u3055\u3001\u3044\u308f\u3086\u308b\u53ef\u8aad\u6027\u306e\u5411\u4e0a\u306b\u3064\u306a\u304c\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n<ol>\n<li>\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u3092\u6700\u5c0f\u306e\u30b3\u30fc\u30c9\u91cf\u3067\u5b9f\u88c5\u3067\u304d\u308b<\/li>\n<li>\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3068\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3068\u3053\u308d\u3092\u4e00\u3064\u306b\u3067\u304d\u308b<\/li>\n<\/ol>\n<p>\u305f\u3060\u3057\u3001<span>2.<\/span>\u306f\u30e9\u30e0\u30c0\u5f0f\u306e\u4e8c\u6b21\u7684\u306a\u7279\u5fb4\u3067\u3059\u3002\u3067\u3082\u3001\u305d\u308c\u3092\u610f\u8b58\u3057\u3066\u4f7f\u3046\u3068\u4fbf\u5229\u3067\u5206\u304b\u308a\u3084\u3059\u3044\u3088\u3068\u3001\u30e9\u30e0\u30c0\u5f0f\u3092\u8003\u3048\u305f\u4eba\u305f\u3061\u304c\u304a\u52e7\u3081\u3057\u3066\u3044\u308b\u3060\u3051\u306a\u306e\u3067\u3001\u52d8\u9055\u3044\u3057\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4>\uff11-\uff13-\uff11\uff0e\u30e9\u30e0\u30c0\u5f0f\u3067\u5b9f\u73fe\u3067\u304d\u308b\u300c\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5206\u304b\u308a\u3084\u3059\u3055\u300d\u3068\u306f<span>?<\/span><\/h4>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306e\u5206\u304b\u308a\u3084\u3059\u3055\u3068\u306f\u3001\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u304c\u300c\u305d\u306e\u307e\u307e\u305d\u3053\u306b\u300d\u66f8\u3044\u3066\u3042\u308b\u3053\u3068\u3067\u3059\u3002\u4f55\u3092\u3057\u3066\u3044\u308b\u304b\u3092\u8abf\u3079\u308b\u305f\u3081\u306b\u3001\u5225\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u308f\u3056\u308f\u3056\u898b\u306b\u884c\u304b\u306a\u304f\u3066\u3082\u3044\u3044\u306e\u3067\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001<span>1-1<\/span>\u306e<span>2<\/span>\u3064\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u3001\u3069\u3061\u3089\u306e\u65b9\u304c\u300c\u3084\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u3084\u3059\u3044\u300d\u3068\u8a00\u3048\u305d\u3046\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u6700\u521d\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u3001<span>Comparator<\/span>\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u3068\u305d\u308c\u3092\u4f7f\u3046\u30af\u30e9\u30b9\u306f\u5225\u306e\u30d5\u30a1\u30a4\u30eb\u3067\u3059\u3002\u3067\u3059\u304b\u3089\u3001\u5225\u30d5\u30a1\u30a4\u30eb\u306e\u30e1\u30bd\u30c3\u30c9\u5b9f\u88c5\u3092\u898b\u306a\u3044\u3068\u5b9f\u969b\u306e\u51e6\u7406\u306f\u5206\u304b\u3089\u306a\u3044\u306e\u3067\u3001\u5c11\u3057\u9762\u5012\u3067\u3059\u3002<\/p>\n<p>\u5f8c\u306e\u65b9\u3067\u306e\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u3063\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u3001\u51e6\u7406\u306e\u5185\u5bb9\u304c\u300c\u305d\u306e\u307e\u307e\u305d\u3053\u306b\u300d\u66f8\u3044\u3066\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u9055\u3044\u306f\u3001\u8aad\u307f\u3084\u3059\u3055\u306e\u9762\u304b\u3089\u306f\u306a\u304b\u306a\u304b\u5927\u304d\u3044\u3067\u3059\u3088\u3002<\/p>\n<h2><span id=\"JAVA-2\">\uff12\uff0e\u3010JAVA\u3011\u30af\u30e9\u30b9\u304c\u30e9\u30e0\u30c0\u5f0f\u306b\u306a\u308b\u307e\u3067<\/span><\/h2>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001\u666e\u901a\u306e\u30af\u30e9\u30b9\u304c\u30e9\u30e0\u30c0\u5f0f\u306b\u306a\u308b\u904e\u7a0b\u3092\u4e00\u3064\u305a\u3064\u8ffd\u3063\u3066\u3044\u304d\u307e\u3059\u3002\u3053\u306e\u624b\u9806\u3092\u3057\u3063\u304b\u308a\u4e00\u3064\u305a\u3064\u7406\u89e3\u3057\u3066\u3044\u3051\u3070\u3001\u300c\u30e9\u30e0\u30c0\u5f0f\u8133\u300d\u306b\u306a\u308c\u308b\u3053\u3068\u9593\u9055\u3044\u306a\u3057\u3067\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001\u5148\u307b\u3069\u304a\u4f1d\u3048\u3057\u305f\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304c\u300c\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092<span>1<\/span>\u3064\u3060\u3051\u6301\u3064\u300d\u3068\u3044\u3046\u6027\u8cea\u304c\u3001\u9014\u4e2d\u3067\u5927\u5909\u5f79\u7acb\u3064\u30bf\u30a4\u30df\u30f3\u30b0\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u304c\u3069\u3053\u304b\u3092\u697d\u3057\u307f\u306b\u3057\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3><span id=\"i-3\">\uff12-\uff11\uff0e\u666e\u901a\u306e\u30af\u30e9\u30b9\u304b\u3089\u533f\u540d\u30af\u30e9\u30b9\u306b\u306a\u308b\u307e\u3067<\/span><\/h3>\n<h4>\uff12-\uff11-\uff11\uff0e\u666e\u901a\u306e\u30af\u30e9\u30b9<\/h4>\n<p>\u307e\u305a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u666e\u901a\u306e\u30af\u30e9\u30b9\u304b\u3089\u59cb\u3081\u307e\u3059\u3002\u3053\u308c\u304c\u5206\u304b\u3089\u306a\u3044\u306a\u3089\u3001\u30e9\u30e0\u30c0\u5f0f\u306b\u6311\u6226\u3059\u308b\u306e\u306f\u65e9\u3059\u304e\u307e\u3059\u3002\u7533\u3057\u8a33\u3042\u308a\u307e\u305b\u3093\u304c\u3001<span>Java<\/span>\u306e\u57fa\u672c\u304b\u3089\u52c9\u5f37\u3057\u3066\u304d\u3066\u304f\u3060\u3055\u3044\u306d\u3002<\/p>\n<p><strong><span class=\"f-marker-p\">\u3010\u53c2\u8003\u3011java.util.Comparator\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u5b9a\u7fa9(\u629c\u7c8b)<\/span><\/strong><span><\/span><\/p>\n<pre class=\"prettyprint lang:default decode:true\">public interface Comparator&lt;T&gt; {\r\n    int compare(T o1, T o2);\r\n}<\/pre>\n<p><strong><span class=\"f-marker-y\">ComparatorImpl.java<\/span><\/strong><\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Comparator;\r\n\r\nclass ComparatorImpl implements Comparator&lt;String&gt; {\r\n    public int compare(String s1, String s2) {\r\n        return s1.compareTo(s2);\r\n    }\r\n}<\/pre>\n<p><strong><span class=\"f-marker-y\">ComparatorImplTest.java<\/span><\/strong><\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Comparator;\r\n\r\nclass ComparatorImplTest {\r\n    public static void main(String[] args) {\r\n        Comparator&lt;String&gt; c = new ComparatorImpl();\r\n        System.out.println(c.compare(\"ABC\", \"DEF\"));\r\n    }\r\n}<\/pre>\n<h4>\uff12-\uff11-\uff12\uff0e\u5185\u90e8\u30af\u30e9\u30b9<\/h4>\n<p>\u6b21\u306b\u3001\u305d\u308c\u305e\u308c\u5225\u306e\u30d5\u30a1\u30a4\u30eb<span>(.java)<\/span>\u3060\u3063\u305f\u306e\u3092\u3001\u4e00\u3064\u306e\u30d5\u30a1\u30a4\u30eb\u306b\u3057\u307e\u3057\u305f\u3002<span>static<\/span>\u306a\u5185\u90e8\u30af\u30e9\u30b9<span>(inner class)<\/span>\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u304c\u3001<span>main<\/span>\u304b\u3089\u547c\u3076\u305f\u3081\u306a\u306e\u3067\u3001\u672c\u8cea\u7684\u306a\u9055\u3044\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p><strong><span class=\"f-marker-y\">ComparatorImplTest.java<\/span><\/strong><\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Comparator;\r\n\r\nclass ComparatorImplTest {\r\n    public static void main(String[] args) {\r\n        Comparator&lt;String&gt; c = new ComparatorImpl();\r\n        System.out.println(c.compare(\"ABC\", \"DEF\"));\r\n    }\r\n\r\n    static class ComparatorImpl implements Comparator&lt;String&gt; {\r\n        public int compare(String s1, String s2) {\r\n            return s1.compareTo(s2);\r\n        }\r\n    }\r\n}<\/pre>\n<h4>\uff12-\uff11-\uff13\uff0e\u30ed\u30fc\u30ab\u30eb\u30af\u30e9\u30b9<\/h4>\n<p>\u3055\u3089\u306b\u3001\u5185\u90e8\u30af\u30e9\u30b9\u3092\u30ed\u30fc\u30ab\u30eb\u30af\u30e9\u30b9<span>(local class)<\/span>\u306b\u3057\u307e\u3059\u3002\u30ed\u30fc\u30ab\u30eb\u30af\u30e9\u30b9\u306f\u3042\u307e\u308a\u4f7f\u3063\u305f\u3053\u3068\u304c\u306a\u3044\u65b9\u304c\u591a\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u3053\u3046\u3044\u3046\u66f8\u304d\u65b9\u3082<span>Java<\/span>\u3067\u306f\u3042\u308a\u306a\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Comparator;\r\n\r\nclass ComparatorImplTest {\r\n    public static void main(String[] args) {\r\n        class ComparatorImpl implements Comparator&lt;String&gt; {\r\n            public int compare(String s1, String s2) {\r\n                return s1.compareTo(s2);\r\n            }\r\n        }\r\n        Comparator&lt;String&gt; c = new ComparatorImpl();\r\n        System.out.println(c.compare(\"ABC\", \"DEF\"));\r\n    }\r\n}<\/pre>\n<h4>\uff12-\uff11-\uff14\uff0e\u533f\u540d\u30af\u30e9\u30b9<\/h4>\n<p>\u305d\u3057\u3066\u3001\u30ed\u30fc\u30ab\u30eb\u30af\u30e9\u30b9\u3092\u533f\u540d\u30af\u30e9\u30b9<span>(anonymous class)<\/span>\u306b\u3057\u307e\u3059\u3002\u30af\u30e9\u30b9\u306e\u5ba3\u8a00\u3068\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210<span>(new)<\/span>\u304c<span>1<\/span>\u884c\u306b\u306a\u308a\u3001\u30af\u30e9\u30b9\u540d\u3082\u6d88\u3048\u307e\u3057\u305f\u3002\u3053\u306e\u533f\u540d\u30af\u30e9\u30b9\u306e\u30af\u30e9\u30b9\u540d\u306f\u3001<span>Java<\/span>\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u52dd\u624b\u306b\u547d\u540d\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u304c\u30e9\u30e0\u30c0\u5f0f\u306e\u30d9\u30fc\u30b9\u306b\u306a\u308b\u3082\u306e\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u30e9\u30e0\u30c0\u5f0f\u306f\u7279\u6b8a\u306a\u66f8\u304d\u65b9\u3067\u533f\u540d\u30af\u30e9\u30b9<span>(<\/span>\u306e\u3088\u3046\u306a\u3082\u306e<span>)<\/span>\u3092\u4f5c\u308b\u6587\u6cd5\u3060\u3068\u3082\u8a00\u3048\u308b\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Comparator;\r\n\r\nclass ComparatorImplTest {\r\n    public static void main(String[] args) {\r\n        Comparator&lt;String&gt; c = new Comparator&lt;String&gt;() {\r\n            public int compare(String s1, String s2) {\r\n                return s1.compareTo(s2);\r\n            }\r\n        };\r\n        System.out.println(c.compare(\"ABC\", \"DEF\"));\r\n    }\r\n}<\/pre>\n<p>\u3055\u3066\u7686\u3055\u3093\u3001\u3053\u3053\u307e\u3067\u306f\u3064\u3044\u3066\u3053\u308c\u3066\u3044\u307e\u3059\u304b<span>? <\/span>\u3067\u306f\u3001\u3069\u3093\u3069\u3093\u98db\u3070\u3057\u3066\u3044\u304d\u307e\u3059\u3088<span>!!<\/span><\/p>\n<h3><span id=\"i-4\">\uff12-\uff12\uff0e\u533f\u540d\u30af\u30e9\u30b9\u304c\u30e9\u30e0\u30c0\u5f0f\u306b\u306a\u308b\u307e\u3067<\/span><\/h3>\n<p>\u3067\u306f\u3001\u533f\u540d\u30af\u30e9\u30b9\u3068\u306a\u3063\u305f\u3068\u3053\u308d\u304b\u3089\u3001\u3044\u3089\u306a\u3044\u3082\u306e\u3092\u524a\u3063\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u6700\u7d42\u7684\u306b\u30e9\u30e0\u30c0\u5f0f\u306b\u306a\u308b\u307e\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u306f\u901a\u308a\u307e\u305b\u3093\u306e\u3067\u3001\u304f\u308c\u3050\u308c\u3082\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3053\u3053\u3067\u300c\u3044\u3089\u306a\u3044\u3082\u306e\u300d\u3068\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u4e0a\u306e\u3069\u3053\u304b\u304b\u3089\u5f97\u3089\u308c\u308b\u60c5\u5831\u3067\u63a8\u6e2c\u304c\u3067\u304d\u308b\u306e\u3067\u3001\u308f\u3056\u308f\u3056\u30d7\u30ed\u30b0\u30e9\u30e0\u4e0a\u306b\u66f8\u304b\u306a\u304f\u3066\u3082\u3044\u3044\u306e\u3067\u306f\u306a\u3044\u304b<span>?<\/span>\u3068\u8003\u3048\u3089\u308c\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n<p><strong><span class=\"f-marker-p\">\u3010\u53c2\u8003\u3011java.util.Comparator\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u5b9a\u7fa9(\u629c\u7c8b)<\/span><\/strong><\/p>\n<pre class=\"prettyprint lang:default decode:true\">public interface Comparator&lt;T&gt; {\r\n    int compare(T o1, T o2);\r\n}<\/pre>\n<h4>\uff12-\uff12-\uff11\uff0e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u540d\u3092\u524a\u9664\u3059\u308b<\/h4>\n<p>\u307e\u305a\u306f\u3001\u4ee3\u5165\u6f14\u7b97\u5b50\u306e\u53f3\u8fba\u306b\u3042\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u540d\u3092\u524a\u9664\u3057\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Comparator&lt;String&gt; c = new {\r\n    public int compare(String s1, String s2) {\r\n        return s1.compareTo(s2);\r\n    }\r\n};<\/pre>\n<p>\u4ee3\u5165\u6f14\u7b97\u5b50\u5de6\u8fba\u306e\u5909\u6570\u5ba3\u8a00\u3067\u306e\u578b\u3068\u3001\u53f3\u8fba\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u6307\u5b9a\u3057\u305f\u90e8\u5206\u304c\u540c\u3058<span>(Comparator&lt;String&gt;)<\/span>\u306a\u306e\u3067\u3001\u540c\u3058\u3053\u3068\u3092\u4e8c\u5ea6\u66f8\u304f\u5fc5\u8981\u306f\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<h4>\uff12-\uff12-\uff12\uff0e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3092\u524a\u9664\u3059\u308b<\/h4>\n<p>\u6b21\u306b\u3001\u5b9f\u88c5\u30e1\u30bd\u30c3\u30c9\u306e\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3067\u3042\u308b<span>public<\/span>\u3092\u524a\u9664\u3057\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Comparator&lt;String&gt; c = new {\r\n    int compare(String s1, String s2) {\r\n        return s1.compareTo(s2);\r\n    }\r\n};<\/pre>\n<p>Java\u3067\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306f\u4f8b\u5916\u306a\u304f<span>public<\/span>\u306a\u306e\u3067\u3001\u8a18\u8ff0\u3092\u7701\u7565\u3057\u3066\u3082\u305d\u306e\u610f\u5473\u306f\u5909\u308f\u3089\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<h4>\uff12-\uff12-\uff13\uff0e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306e\u578b\u3092\u524a\u9664\u3059\u308b<\/h4>\n<p>\u5b9f\u88c5\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306e<span>int<\/span>\u3092\u524a\u9664\u3057\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Comparator&lt;String&gt; c = new {\r\n    compare(String s1, String s2) {\r\n        return s1.compareTo(s2);\r\n    }\r\n};<\/pre>\n<p>Comparator&lt;T&gt;\u306b\u306f\u3001\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u304c<span>int compare(T o1, T o2)<\/span>\u306e\u300c<span>1<\/span>\u3064\u3057\u304b\u300d\u3042\u308a\u307e\u305b\u3093\u306e\u3067\u3001\u623b\u308a\u5024\u306e\u578b\u306f<span>int<\/span>\u4ee5\u5916\u306b\u3042\u308a\u3048\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<h4>\uff12-\uff12-\uff14\uff0e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u30e1\u30bd\u30c3\u30c9\u540d\u3092\u524a\u9664\u3059\u308b<\/h4>\n<p>\u30e1\u30bd\u30c3\u30c9\u540d\u3082\u524a\u9664\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Comparator&lt;String&gt; c = new {\r\n    (String s1, String s2) {\r\n        return s1.compareTo(s2);\r\n    }\r\n};<\/pre>\n<p>Comparator\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306f<span>compare<\/span>\u306e\u300c<span>1<\/span>\u3064\u3057\u304b\u300d\u306a\u3044\u306e\u3067\u3001\u305d\u308c\u3057\u304b\u9078\u3073\u3088\u3046\u304c\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<h4>\uff12-\uff12-\uff15\uff0e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306e\u578b\u3092\u524a\u9664\u3059\u308b<\/h4>\n<p>\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306e\u578b<span>(String)<\/span>\u3082\u524a\u9664\u3057\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Comparator&lt;String&gt; c = new {\r\n    (s1, s2) {\r\n        return s1.compareTo(s2);\r\n    }\r\n};<\/pre>\n<p>\u5de6\u8fba\u306e\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u578b\u304b\u3089\u3001<span>Comparator&lt;T&gt;<\/span>\u3078\u306e\u5b9f\u578b\u5f15\u6570\u304c<span>String<\/span>\u3060\u3068\u5206\u304b\u308b\u306e\u3067\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306e\u578b\u3082<span>String<\/span>\u3067\u78ba\u5b9a\u3059\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<h4>\uff12-\uff12-\uff16\uff0e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e<span>return<\/span>\u3092\u524a\u9664\u3059\u308b<\/h4>\n<p>\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u306b\u3042\u308b<span>return<\/span>\u3092\u524a\u9664\u3057\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Comparator&lt;String&gt; c = new {\r\n    (s1, s2) {\r\n        s1.compareTo(s2);\r\n    }\r\n};<\/pre>\n<p>\u300c<span>s1.compareTo(s2)<\/span>\u300d\u306e\u623b\u308a\u5024\u306f<span>int<\/span>\u3067\u3059\u3002\u30e9\u30c3\u30ad\u30fc\u306a\u3053\u3068\u306b\u3001<span>int<\/span>\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306e\u578b\u3068\u540c\u3058\u3067\u3001\u305d\u306e\u307e\u307e<span>return<\/span>\u3057\u3066\u3044\u308b\u3060\u3051\u3067\u3059<span>!! <\/span>\u306a\u306e\u3067\u3001<span>return<\/span>\u3057\u3066\u3044\u308b\u3053\u3068\u306b\u3057\u3061\u3083\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4>\uff12-\uff12-\uff17\uff0e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e<span>{}<\/span>\u3068<span>;<\/span>\u3092\u524a\u9664\u3059\u308b<\/h4>\n<p>\u3055\u3089\u306b\u3001\u30e1\u30bd\u30c3\u30c9\u672c\u4f53\u3092\u56f2\u3063\u3066\u3044\u308b\u62ec\u5f27<span>({})<\/span>\u3068\u3001\u6587\u3092\u533a\u5207\u308b<span>;<\/span>\u3082\u4e00\u7dd2\u306b\u524a\u9664\u3057\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Comparator&lt;String&gt; c = new {\r\n    (s1, s2) \r\n        s1.compareTo(s2)\r\n};<\/pre>\n<p>\u3069\u3046\u305b\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u8eab\u306f<span>return<\/span>\u3059\u308b<span>1<\/span>\u884c\u3057\u304b\u306a\u3044\u306e\u3067\u3059\u304b\u3089\u3001\u30e1\u30bd\u30c3\u30c9\u3067\u8907\u6570\u884c\u3092\u66f8\u304f\u305f\u3081\u306b\u5fc5\u8981\u306a\u3060\u3051\u306e<span>{}<\/span>\u3084<span>;<\/span>\u306a\u3093\u3066\u3001\u305c\u3093\u305c\u3093\u3044\u3089\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n<h4>\uff12-\uff12-\uff18\uff0e\u533f\u540d\u30af\u30e9\u30b9\u306e<span>{}<\/span>\u3092\u524a\u9664\u3059\u308b<\/h4>\n<p>\u4eca\u5ea6\u306f\u533f\u540d\u30af\u30e9\u30b9\u306e\u62ec\u5f27<span>{}<\/span>\u3092\u524a\u9664\u3057\u307e\u3057\u305f\u3002\u305d\u308d\u305d\u308d\u7d42\u308f\u308a\u304c\u898b\u3048\u3066\u304d\u307e\u3057\u305f\u306d\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Comparator&lt;String&gt; c = new\r\n    (s1, s2) \r\n        s1.compareTo(s2)\r\n;<\/pre>\n<p>\u3053\u306e\u30af\u30e9\u30b9\u306b\u306f<span>Comparator<\/span>\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3060\u3051\u3042\u308a\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u3084\u4ed6\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u3067\u3059\u304b\u3089\u3001\u8907\u6570\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3084\u30e1\u30bd\u30c3\u30c9\u3092<span>1<\/span>\u3064\u306e\u30af\u30e9\u30b9\u306b\u307e\u3068\u3081\u308b\u62ec\u5f27\u306f\u3044\u308a\u307e\u305b\u3093\u3002<\/p>\n<h4>\uff12-\uff12-\uff19\uff0enew\u3092\u524a\u9664\u3059\u308b<\/h4>\n<p>\u3053\u3053\u307e\u3067\u6765\u308b\u3068\u3001\u3082\u3046<span>new<\/span>\u3082\u3044\u308a\u307e\u305b\u3093\u306d\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Comparator&lt;String&gt; c =\r\n    (s1, s2) \r\n        s1.compareTo(s2)\r\n;<\/pre>\n<p>\u5143\u3005\u306e\u533f\u540d\u30af\u30e9\u30b9\u306e\u69cb\u6587\u305d\u306e\u3082\u306e\u304c\u3001\u30af\u30e9\u30b9\u304b\u3089\u4f5c\u3089\u308c\u305f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u623b\u3059\u69cb\u6587\u306a\u306e\u3067\u3059\u304b\u3089\u3002\u3053\u308c\u3082\u308f\u3056\u308f\u3056\u66f8\u304f\u5fc5\u8981\u306f\u306a\u304f\u3066\u3001\u305d\u3046\u3044\u3046\u3053\u3068\u306b\u3057\u3066\u3057\u307e\u3048\u3070\u3044\u3044\u306e\u3067\u3059\u3002<\/p>\n<h4>\uff12-\uff12-10\uff0e\u30e9\u30e0\u30c0\u5f0f\u306e\u5b8c\u6210<\/h4>\n<p>\u3068\u3044\u3046\u308f\u3051\u3067\u3001\u6700\u5f8c\u307e\u3067\u6b8b\u3063\u305f\u306e\u306f\u3001\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306e\u540d\u524d\u3068\u3001\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u8eab\u3060\u3051\u3002\u3053\u308c\u306b\u30e9\u30e0\u30c0\u5f0f\u3060\u3068\u898b\u5206\u3051\u308b\u305f\u3081\u306e\u300c<span>-&gt;<\/span>\u300d\u3092\u631f\u3093\u3067<span>1<\/span>\u884c\u306b\u3059\u308c\u3070\u3001\u3081\u3067\u305f\u304f\u30e9\u30e0\u30c0\u5f0f\u306e\u5b8c\u6210\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Comparator;\r\n\r\nclass ComparatorImplTest {\r\n    public static void main(String[] args) {\r\n        Comparator&lt;String&gt; c = (s1, s2) -&gt; s1.compareTo(s2);\r\n        System.out.println(c.compare(\"ABC\", \"DEF\"));\r\n    }\r\n}<\/pre>\n<h3><span id=\"i-5\">\uff12-\uff13\uff0e\u30e9\u30e0\u30c0\u5f0f\u306f\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304c\u3042\u3063\u3066\u3053\u305d<\/span><\/h3>\n<p>\u3053\u306e\u4f8b\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u305f\u306e\u306f\u3001\u4ee3\u5165\u6f14\u7b97\u5b50\u306e\u5de6\u8fba\u306e\u5909\u6570\u306e\u578b\u300c<span>Comparator&lt;String&gt;<\/span>\u300d\u3067\u3059\u3002\u3053\u306e\u578b\u304c\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u6c7a\u307e\u308a\u3054\u3068\u3092\u5b88\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u30e9\u30e0\u30c0\u5f0f\u304c\u6210\u308a\u7acb\u3064\u306e\u3067\u3059\u3002<\/p>\n<p>\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306b\u306f<span>1<\/span>\u3064\u3057\u304b\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u304c\u306a\u3044\u306e\u3067\u3001\u623b\u308a\u5024\u30fb\u5f15\u6570\u306e\u578b\u3068\u9806\u756a\u3092\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u578b\u304b\u3089<span>Java<\/span>\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u63a8\u6e2c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u4ed5\u7d44\u307f\u3092\u578b\u63a8\u8ad6\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306e\u88cf\u5074\u3067\u306f\u3001\u30af\u30e9\u30b9\u306e\u5909\u5f62\u624b\u9806\u306e\u4e00\u756a\u6700\u521d\u306b\u51fa\u3066\u304d\u305f\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u533f\u540d\u30af\u30e9\u30b9\u3092<span>Java<\/span>\u304c\u81ea\u52d5\u3067\u4f5c\u308a\u3001\u305d\u306e\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u65b0\u3057\u304f\u751f\u6210\u3057\u3066\u623b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3067\u3059\u304b\u3089\u3001\u4eca\u306a\u3089\u4ee5\u4e0b\u306e\u30e9\u30e0\u30c0\u5f0f\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b\u7406\u7531\u304c\u5206\u304b\u308b\u3067\u3057\u3087\u3046\u3002\u306a\u305c\u306a\u3089\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u5bfe\u8c61\u3068\u306a\u308b\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304c\u4f55\u304b\u3001<span>Java<\/span>\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u5206\u304b\u3089\u306a\u3044\u304b\u3089\u3067\u3059\u306d\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ComparatorImplTest {\r\n    public static void main(String[] args) {\r\n        (s1, s2) -&gt; s1.compareTo(s2);\r\n    }\r\n}<\/pre>\n<p>\u3055\u3089\u306b\u3001\u5909\u6570\u306e\u578b\u304c\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u3042\u308a\u3055\u3048\u3059\u308c\u3070\u3044\u3044\u306e\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5ba3\u8a00\u3068\u521d\u671f\u5316\u306e\u6642\u306b\u3082\u4f7f\u3048\u307e\u3059\u3057\u3001\u5909\u6570\u306b\u518d\u4ee3\u5165\u3092\u3059\u308b\u6642\u306b\u3082\u4f7f\u3048\u308b\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Comparator;\r\n\r\npublic class ComparatorImplTest {\r\n    Comparator&lt;String&gt; c1 = (s1, s2) -&gt; s1.compareTo(s2);\r\n    static Comparator&lt;String&gt; c2 = (s1, s2) -&gt; s1.compareTo(s2);\r\n}<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">Comparator&lt;String&gt; c = null;\r\nc = (s1, s2) -&gt; s1.compareTo(s2);<\/pre>\n<h3><span id=\"i-6\">\uff12-\uff14\uff0e\u578b\u306f\u5f15\u6570\u3084\u623b\u308a\u5024\u306a\u3069\u304b\u3089\u3082\u5206\u304b\u308b<\/span><\/h3>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u578b\u3092\u30d2\u30f3\u30c8\u306b\u3001\u533f\u540d\u30af\u30e9\u30b9\u3092\u30e9\u30e0\u30c0\u5f0f\u306b\u5909\u5f62\u3057\u307e\u3057\u305f\u3002\u3067\u3082\u3001<span>Java<\/span>\u3067\u578b\u304c\u51fa\u3066\u304f\u308b\u6240\u306f\u3001\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u5ba3\u8a00\u4ee5\u5916\u3060\u3068\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3068\u623b\u308a\u5024\u3082\u3042\u308a\u307e\u3059\u3088\u306d\u3002<\/p>\n<p>\u3067\u3059\u304b\u3089\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5f15\u6570\u306b\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u306a\u3089\u3001\u305d\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3068\u3053\u308d\u3067\u3082\u30e9\u30e0\u30c0\u5f0f\u304c\u66f8\u3051\u308b\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Comparator;\r\n\r\nclass ComparatorImplTest {\r\n    public static void main(String[] args) {\r\n        lamdaMethod((s1, s2) -&gt; s1.compareTo(s2));\r\n    }\r\n\r\n    static void lambdaMethod(Comparator&lt;String&gt; c) {\r\n        System.out.println(c.compare(\"ABC\", \"DEF\"));\r\n    }\r\n}<\/pre>\n<p>\u306a\u305c\u306a\u3089\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u5bfe\u8c61\u3068\u306a\u308b\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304c\u4f55\u304b\u304c\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306e\u578b\u304b\u3089<span>Java<\/span>\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u5206\u304b\u308b\u304b\u3089\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3078\u3082\u578b\u63a8\u8ad6\u304c\u50cd\u304f\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3068\u3084\u3063\u3066\u3044\u308b\u3053\u3068\u306f\u540c\u3058\u3067\u3059\u3002\u3053\u306e\u533f\u540d\u30af\u30e9\u30b9\u306e\u30e9\u30e0\u30c0\u5f0f\u3078\u306e\u5909\u5f62\u624b\u9806\u306f\u3001\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3092\u76f8\u624b\u306b\u3057\u3066\u3044\u305f\u6642\u3068\u307e\u3063\u305f\u304f\u540c\u3058\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Comparator;\r\n\r\nclass ComparatorImplTest {\r\n    public static void main(String[] args) {\r\n        lamdaMethod(\r\n            new Comparator&lt;String&gt;() {\r\n                public int compare(String s1, String s2) {\r\n                    return s1.compareTo(s2);\r\n                }\r\n            }\r\n        );\r\n    }\r\n\r\n    static void lamdaMethod(Comparator&lt;String&gt; c) {\r\n        System.out.println(c.compare(\"ABC\", \"DEF\"));\r\n    }\r\n}<\/pre>\n<p>\u3055\u3089\u306b\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306e\u578b\u3082\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u5bfe\u8c61\u3068\u306a\u308b\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u63a2\u308b\u30d2\u30f3\u30c8\u3068\u3057\u3066\u306f\u6709\u52b9\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u30e9\u30e0\u30c0\u5f0f\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3082\u66f8\u3051\u3066\u3057\u307e\u3046\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Comparator;\r\n\r\nclass ComparatorImplTest {\r\n    public static void main(String[] args) {\r\n        Comparator&lt;String&gt; c = getComparator();\r\n        System.out.println(c.compare(\"ABC\", \"DEF\"));\r\n    }\r\n\r\n    static Comparator&lt;String&gt; getComparator() {\r\n        return (s1, s2) -&gt; s1.compareTo(s2);\r\n    }\r\n}<\/pre>\n<p>\u30de\u30cb\u30a2\u30c3\u30af\u3067\u3059\u304c\u3001\u30ad\u30e3\u30b9\u30c8\u3067\u306e\u5909\u6570\u306e\u578b\u3082\u3001<span>Java<\/span>\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u30e9\u30e0\u30c0\u5f0f\u306e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3068\u3057\u3066\u8a8d\u8b58\u3057\u3066\u304f\u308c\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3060\u3001\u3053\u308c\u304c\u5fc5\u8981\u306a\u7b87\u6240\u306f\u3042\u307e\u308a\u601d\u3044\u3064\u304d\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Object o = (Runnable)() -&gt; System.out.println(\"ABC\");\r\n\r\nif (o instanceof Runnable) {\r\n    System.out.println(\"Runnable\u3067\u30fc\u3059\"); \/\/ \u2192 o\u306e\u5b9f\u4f53\u306fRunnable\u306a\u306e\u3067\u3053\u3061\u3089\u306b\u6765\u308b\r\n}<\/pre>\n<h3><span id=\"-Java\">\uff12-\uff15\uff0eJava\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u30e9\u30e0\u30c0\u5f0f\u3092\u3053\u3046\u898b\u3066\u3044\u308b<\/span><\/h3>\n<p>Java\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u30e9\u30e0\u30c0\u5f0f\u3092\u898b\u3064\u3051\u305f\u3089\u3001\u30e9\u30e0\u30c0\u5f0f\u304c\u66f8\u304b\u308c\u3066\u3044\u308b\u3068\u3053\u308d\u3067\u6271\u308f\u308c\u308b\u300c\u578b\u300d\u3092\u6700\u521d\u306b\u5224\u65ad\u3057\u307e\u3059\u3002\u578b\u306e\u53c2\u7167\u5148\u306f\u3001\u5909\u6570\u306e\u578b\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306e\u578b\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306e\u578b\u3067\u3059\u3002<\/p>\n<p>Java\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u898b\u3064\u3051\u305f\u578b\u304c\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306a\u3089\u3001\u305d\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306e\u578b\u3084\u6570\u3001\u623b\u308a\u5024\u306e\u578b\u306a\u3069\u3092\u8a8d\u8b58\u3057\u3066\u3001\u30e9\u30e0\u30c0\u5f0f\u3067\u66f8\u304b\u308c\u3066\u3044\u308b\u3053\u3068\u3068\u306e\u6574\u5408\u6027\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>Java\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u3053\u3093\u306a\u611f\u3058\u3067\u8003\u3048\u3066\u3044\u308b\u306e\u3067\u3001\u30e9\u30e0\u30c0\u5f0f\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u304c\u51fa\u305f\u6642\u306f\u3001\u307e\u305a\u306f\u578b\u306e\u89b3\u70b9\u3067\u898b\u76f4\u3057\u307e\u3057\u3087\u3046\u3002\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u304c\u304b\u3089\u3080\u5834\u5408\u306f\u5c11\u3005\u3084\u3084\u3053\u3057\u3044\u3067\u3059\u304c\u3001\u4e00\u3064\u305a\u3064\u8ffd\u3063\u3066\u3044\u3051\u3070\u3001\u30c0\u30e1\u306a\u3068\u3053\u308d\u306f\u5fc5\u305a\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001<span>Java<\/span>\u306f\u9759\u7684\u578b\u4ed8\u304d\u8a00\u8a9e\u3068\u547c\u3070\u308c\u308b\u30bf\u30a4\u30d7\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3059\u3002\u9759\u7684\u578b\u4ed8\u304d\u8a00\u8a9e\u3067\u306f\u3001\u5909\u6570\u3001\u5f15\u6570\u3001\u623b\u308a\u5024\u3059\u3079\u3066\u306b\u4f55\u304b\u306e\u578b\u304c\u3042\u308a\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u4e0a\u3067\u660e\u78ba\u306b\u5ba3\u8a00\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3067\u3059\u304b\u3089\u3001\u30e9\u30e0\u30c0\u5f0f\u3068\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u3001\u300c\u578b\u300d\u3067\u6c7a\u307e\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u3059\u3079\u3066\u4e00\u81f4\u3057\u3066\u3044\u308b\u304b\u2026\u306e\u89b3\u70b9\u304c\u3042\u308c\u3070\u3001\u30e9\u30e0\u30c0\u5f0f\u306f\u4e0d\u601d\u8b70\u306a\u3082\u306e\u3067\u3082\u3001\u8a33\u304c\u5206\u304b\u3089\u306a\u3044\u3082\u306e\u3067\u3082\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n<h2><span id=\"JAVA-3\">\uff13\uff0e\u3010JAVA\u3011\u30e9\u30e0\u30c0\u5f0f\u306e\u304a\u7d04\u675f\u3044\u308d\u3044\u308d<\/span><\/h2>\n<p>\u3053\u3053\u307e\u3067\u306e\u5185\u5bb9\u3067\u3001\u30e9\u30e0\u30c0\u5f0f\u3068\u306f\u300c\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u7c21\u5358\u306b\u4f5c\u308b\u305f\u3081\u306e\u6587\u6cd5\u300d\u3060\u3068\u3044\u3046\u3053\u3068\u304c\u304a\u5206\u304b\u308a\u3044\u305f\u3060\u3051\u305f\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u3046\u4e0a\u3067\u899a\u3048\u3066\u304a\u304f\u3079\u304d\u3044\u308d\u3044\u308d\u306a\u4ed5\u69d8\u306b\u3064\u3044\u3066\u3001\u3056\u3063\u3068\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h3><span id=\"i-7\">\uff13-\uff11\uff0e\u30e9\u30e0\u30c0\u5f0f\u306e\u57fa\u672c\u5f62<\/span><\/h3>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306e\u57fa\u672c\u5f62\u306f\u300c\u2460\u5f15\u6570\u306e\u5ba3\u8a00\u90e8<span> -&gt; <\/span>\u2461\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u672c\u4f53\u90e8\u300d\u3067\u3059\u3002\u3053\u3053\u3067\u6ce8\u76ee\u3059\u3079\u304d\u306f\u300c<span>-&gt;<\/span>\u300d<span>(<\/span>\u30a2\u30ed\u30fc\u6f14\u7b97\u5b50<span>)<\/span>\u3067\u3059\u3002<span>Java<\/span>\u3067<span> -&gt; <\/span>\u304c\u51fa\u305f\u306a\u3089\u3001\u305d\u308c\u306f\u30e9\u30e0\u30c0\u5f0f\u3067\u3059\u3002<\/p>\n<p>\u2460\u5f15\u6570\u306e\u5ba3\u8a00\u90e8\u3068\u2461\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u672c\u4f53\u90e8\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u30d1\u30bf\u30fc\u30f3\u304c\u3042\u308a\u307e\u3059\u3002<span>Java<\/span>\u306e\u30e9\u30e0\u30c0\u5f0f\u306f\u3001\u3053\u306e\u2460\u3068\u2461\u306e\u3069\u308c\u304b\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u4f5c\u3089\u308c\u3066\u3044\u308b\u306e\u3067\u3059\u3002<\/p>\n<h4>\uff13-\uff11-\uff11\uff0e\u5f15\u6570\u306e\u5ba3\u8a00\u90e8<\/h4>\n<table style=\"border-collapse: collapse; width: 100%; height: 168px;\">\n<tbody>\n<tr style=\"height: 24px;\">\n<td style=\"width: 50%; height: 24px; border-color: #000000; border-style: solid;\">\u30d1\u30bf\u30fc\u30f3<\/td>\n<td style=\"width: 50%; height: 24px; border-color: #000000; border-style: solid;\">\u5f15\u6570\u90e8\u306e\u66f8\u304d\u65b9<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 50%; height: 24px; border-color: #000000; border-style: solid;\">\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306b\u5f15\u6570\u304c\u306a\u3044\u5834\u5408<\/td>\n<td style=\"width: 50%; height: 24px; border-color: #000000; border-style: solid;\">()<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 50%; height: 72px; border-color: #000000; border-style: solid;\" rowspan=\"3\">\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u304c<span>1<\/span>\u3064\u3060\u3051\u306e\u5834\u5408<\/td>\n<td style=\"width: 50%; height: 24px; border-color: #000000; border-style: solid;\">(\u5f15\u6570\u306e\u578b \u5f15\u6570\u306e\u5909\u6570\u540d<span>)<\/span><\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 50%; height: 24px; border-color: #000000; border-style: solid;\">(\u5f15\u6570\u306e\u5909\u6570\u540d<span>)<\/span><\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 50%; height: 24px; border-color: #000000; border-style: solid;\">\u5f15\u6570\u306e\u5909\u6570\u540d<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 50%; height: 48px; border-color: #000000; border-style: solid;\" rowspan=\"2\">\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u304c<span>2<\/span>\u3064\u4ee5\u4e0a\u306e\u5834\u5408<\/td>\n<td style=\"width: 50%; height: 24px; border-color: #000000; border-style: solid;\">(\u5f15\u6570\u306e\u578b<span>1 <\/span>\u5f15\u6570\u306e\u5909\u6570\u540d<span>1, <\/span>\u5f15\u6570\u306e\u578b<span>2 <\/span>\u5f15\u6570\u306e\u5909\u6570\u540d<span>2, &#8230;)<\/span><\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 50%; height: 24px; border-color: #000000; border-style: solid;\">(\u5f15\u6570\u306e\u5909\u6570\u540d<span>1, <\/span>\u5f15\u6570\u306e\u5909\u6570\u540d<span>2, &#8230;)<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u3069\u306e\u30d1\u30bf\u30fc\u30f3\u3067\u3082\u3001\u5fc5\u9808\u306a\u306e\u306f\u5f15\u6570\u306e\u5909\u6570\u540d\u3067\u3059\u3002\u3053\u308c\u306f\u30e9\u30e0\u30c0\u5f0f\u3092\u7406\u89e3\u3059\u308b\u4e0a\u3067\u306f\u5927\u4e8b\u306a\u3053\u3068\u306a\u306e\u3067\u3001\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001\u5f15\u6570\u306e\u578b\u304c\u7701\u7565\u3055\u308c\u3066\u3082\u3001\u305d\u306e\u5909\u6570\u306e\u578b\u304c\u4f55\u304b\u306f<span>Java<\/span>\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u5206\u304b\u3063\u3066\u3044\u307e\u3059\u3002\u3067\u3059\u304b\u3089\u3001\u30e1\u30bd\u30c3\u30c9\u672c\u4f53\u90e8\u3067\u306f\u305d\u306e\u5909\u6570\u306e\u578b\u304c\u6301\u3064\u30d5\u30a3\u30fc\u30eb\u30c9\u3084\u30e1\u30bd\u30c3\u30c9\u3092\u5168\u90e8\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001\u5f15\u6570\u306e\u578b\u304c\u66f8\u304b\u308c\u3066\u3044\u308b\u306a\u3089\u3001<span>final<\/span>\u306a\u3069\u306e\u4fee\u98fe\u5b50\u3084\u6ce8\u91c8<span>(<\/span>\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3<span>)<\/span>\u3092\u3064\u3051\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u9006\u306b\u3001\u5909\u6570\u540d\u306e\u307f\u3060\u3068\u4fee\u98fe\u5b50\u30fb\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u66f8\u3051\u307e\u305b\u3093\u3002<\/p>\n<p>\u306a\u304a\u3001<span>Java 11<\/span>\u4ee5\u964d\u306a\u3089\u5f15\u6570\u306e\u578b\u306e\u4ee3\u308f\u308a\u306b<span>var(<\/span>\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u578b\u63a8\u8ad6\u3067\u306e\u30ad\u30fc\u30ef\u30fc\u30c9<span>)<\/span>\u3082\u4f7f\u3048\u307e\u3059<span>(JEP323)<\/span>\u3002\u305f\u3060\u3001\u30e9\u30e0\u30c0\u5f0f\u306f\u5f15\u6570\u306e\u578b\u3092\u5143\u3005\u7701\u7565\u3067\u304d\u308b\u306e\u3067\u3001<span>var<\/span>\u3068\u3059\u308b\u610f\u5473\u306f\u3042\u307e\u308a\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h4>\uff13-\uff11-\uff12\uff0e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u672c\u4f53\u90e8<\/h4>\n<table style=\"border-collapse: collapse; width: 100%; height: 216px;\">\n<tbody>\n<tr style=\"height: 48px;\">\n<td style=\"width: 33.3333%; height: 48px; border-style: solid; border-color: #000000;\" rowspan=\"3\">\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306e\u578b\u304c<span>void<\/span>\u306e\u5834\u5408<\/td>\n<td style=\"width: 33.3333%; height: 72px; border-style: solid; border-color: #000000;\" rowspan=\"2\">\u30e1\u30bd\u30c3\u30c9\u306e\u5185\u5bb9\u304c<span>1<\/span>\u884c\u3067\u66f8\u3051\u308b\u5834\u5408<\/td>\n<td style=\"width: 33.3333%; height: 48px; border-style: solid; border-color: #000000;\">\u51e6\u7406<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 33.3333%; height: 24px; border-style: solid; border-color: #000000;\">{\u51e6\u7406<span>;}<\/span><\/td>\n<\/tr>\n<tr style=\"height: 48px;\">\n<td style=\"width: 33.3333%; height: 48px; border-style: solid; border-color: #000000;\">\u30e1\u30bd\u30c3\u30c9\u306e\u5185\u5bb9\u304c<span>2<\/span>\u884c\u4ee5\u4e0a\u306b\u306a\u308b\u5834\u5408<\/td>\n<td style=\"width: 33.3333%; height: 48px; border-style: solid; border-color: #000000;\">{\u51e6\u7406<span>1<\/span>\u884c\u76ee<span>; <\/span>\u51e6\u7406<span>2<\/span>\u884c\u76ee<span>; &#8230;}<\/span><\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 33.3333%; height: 24px; border-style: solid; border-color: #000000;\" rowspan=\"3\">\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306e\u578b\u304c<span>void<\/span>\u3067\u306f\u306a\u3044\u5834\u5408<\/td>\n<td style=\"width: 33.3333%; height: 48px; border-style: solid; border-color: #000000;\" rowspan=\"2\">\u30e1\u30bd\u30c3\u30c9\u306e\u5185\u5bb9\u304c<span>1<\/span>\u884c\u3067\u66f8\u3051\u308b\u5834\u5408<\/td>\n<td style=\"width: 33.3333%; height: 24px; border-style: solid; border-color: #000000;\">\u623b\u308a\u5024\u3092\u623b\u3059\u51e6\u7406<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 33.3333%; height: 24px; border-style: solid; border-color: #000000;\">{return \u623b\u308a\u5024\u3092\u623b\u3059\u51e6\u7406<span>;}<\/span><\/td>\n<\/tr>\n<tr style=\"height: 48px;\">\n<td style=\"width: 33.3333%; height: 48px; border-style: solid; border-color: #000000;\">\u30e1\u30bd\u30c3\u30c9\u306e\u5185\u5bb9\u304c<span>2<\/span>\u884c\u4ee5\u4e0a\u306b\u306a\u308b\u5834\u5408<\/td>\n<td style=\"width: 33.3333%; height: 48px; border-style: solid; border-color: #000000;\">{\u51e6\u7406<span>1<\/span>\u884c\u76ee<span>; <\/span>\u51e6\u7406<span>2<\/span>\u884c\u76ee<span>; &#8230;; return <\/span>\u51e6\u7406\u7d50\u679c<span>;}<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306a\u3089\u3067\u306f\u306e\u3053\u3068\u306f\u3001<span>{}<\/span>\u3084<span>return<\/span>\u3092\u7701\u7565\u3067\u304d\u308b\u5834\u5408\u304c\u3042\u308b\u3053\u3068\u3067\u3059\u3002\u5148\u8ff0\u3057\u305f\u3001\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u4e0a\u3067\u5fc5\u8981\u6700\u5c0f\u9650\u306a\u3053\u3068\u306f\u4f55\u3060\u308d\u3046\u2026\u306e\u8996\u70b9\u304c\u3042\u308c\u3070\u3001\u7d0d\u5f97\u3067\u304d\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>{}\u304c\u3042\u308b\u306a\u3089\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u8eab\u306f\u8907\u6570\u884c\u3067\u66f8\u3051\u307e\u3059\u3057\u3001<span>1<\/span>\u884c\u3060\u3051\u3067\u3082<span>OK<\/span>\u3067\u3059\u3002\u666e\u901a\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u3058\u304f\u3001\u6539\u884c\u3084\u30a4\u30f3\u30c7\u30f3\u30c8\u306f\u81ea\u7531\u3067\u3059\u3002<span>{}<\/span>\u304c\u306a\u3044\u306a\u3089<span>1<\/span>\u884c\u3057\u304b\u66f8\u3051\u307e\u305b\u3093\u304c\u3001\u6700\u5f8c\u306e<span>;<\/span>\u306f\u3044\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306e\u578b\u304c<span>void<\/span>\u3067\u306f\u306a\u304f\u3001\u3055\u3089\u306b\u30e1\u30bd\u30c3\u30c9\u672c\u4f53\u90e8\u306b<span>{}<\/span>\u304c\u306a\u3044\u306a\u3089\u3001\u305d\u306e\u6587\u3084\u5f0f\u306e\u8a55\u4fa1\u7d50\u679c\u304c\u623b\u308a\u5024\u306e\u578b\u3068\u5408\u3063\u3066\u3044\u308c\u3070<span>OK<\/span>\u3067\u3059\u3002\u3053\u308c\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306e\u300c\u8a55\u4fa1\u300d\u306e\u4ed5\u7d44\u307f\u304c\u5206\u304b\u3063\u3066\u3044\u306a\u3044\u3068\u3001\u30d4\u30f3\u3068\u6765\u306a\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u306d\u3002<\/p>\n<p>return\u306b\u3064\u3044\u3066\u306f\u3001\u623b\u308a\u5024\u306e\u578b\u304c<span>void<\/span>\u3067\u3082\u9014\u4e2d\u3067<span>return<\/span>\u306f\u3067\u304d\u307e\u3059\u3057\u3001<span>void<\/span>\u3067\u306f\u306a\u3044\u306a\u3089\u3069\u3053\u304b\u3067\u5fc5\u305a\u623b\u308a\u5024\u306e\u578b\u3092<span>return<\/span>\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u3089\u3082\u3001\u666e\u901a\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u3058\u30eb\u30fc\u30eb\u3067\u3059\u3002<\/p>\n<h4>\uff13-\uff11-\uff13\uff0e\u5f15\u6570\u3068\u30e1\u30bd\u30c3\u30c9\u672c\u4f53\u306e\u7d44\u307f\u5408\u308f\u305b\u4f8b<\/h4>\n<p>\u4ee5\u4e0b\u306e\u4f8b\u3067\u306f\u3001\u3059\u3079\u3066\u540c\u3058\u3053\u3068\u3092\u3057\u3066\u3044\u307e\u3059\u3002\u7279\u306b\u6ce8\u76ee\u3057\u3066\u3082\u3089\u3044\u305f\u3044\u306e\u306f\u3001\u5f15\u6570\u90e8\u304c\u3069\u3046\u7701\u7565\u3067\u304d\u308b\u304b\u3068\u3001\u30e1\u30bd\u30c3\u30c9\u672c\u4f53\u306e<span>{}<\/span>\u3084<span>return<\/span>\u304c\u3069\u3046\u3044\u3046\u5834\u5408\u306b\u7701\u7565\u3067\u304d\u308b\u304b\u3067\u3059\u3002<\/p>\n<p><strong><span class=\"f-marker-w\">\u5f15\u6570\u306a\u3057\u3001\u623b\u308a\u5024\u306e\u578b\u304cvoid<\/span><\/strong><\/p>\n<pre class=\"prettyprint lang:default decode:true\">Runnable runnable0 = new Runnable() {\r\n    public void run() {\r\n        System.out.println(\"ABC\");\r\n    }\r\n};\r\nRunnable runnable1 = () -&gt; System.out.println(\"ABC\");\r\nRunnable runnable2 = () -&gt; {System.out.println(\"ABC\");};<\/pre>\n<p><strong><span class=\"f-marker-w\">\u5f15\u6570\u306a\u3057\u3001\u623b\u308a\u5024\u306e\u578b\u304cString<\/span><\/strong><\/p>\n<pre class=\"prettyprint lang:default decode:true\">Callable&lt;String&gt; callable0 = new Callable&lt;String&gt;() {\r\n    public String call() {\r\n        return \"ABC\";\r\n    }\r\n};\r\nCallable&lt;String&gt; callable1 = () -&gt; \"ABC\";\r\nCallable&lt;String&gt; callable2 = () -&gt; {return \"ABC\";};<\/pre>\n<p><strong><span class=\"f-marker-w\">\u5f15\u65701\u3064\u3001\u623b\u308a\u5024\u306e\u578b\u304cboolean<\/span><\/strong><\/p>\n<pre class=\"prettyprint lang:default decode:true\">Predicate&lt;String&gt; predicate0 = new Predicate&lt;String&gt;() {\r\n    public boolean test(String s) {\r\n        return \"ABC\".equals(s);\r\n    }\r\n};\r\nPredicate&lt;String&gt; predicate1 = (String s) -&gt; \"ABC\".equals(s);\r\nPredicate&lt;String&gt; predicate2 = (s) -&gt; \"ABC\".equals(s);\r\nPredicate&lt;String&gt; predicate3 = s -&gt; \"ABC\".equals(s);<\/pre>\n<p><strong><span class=\"f-marker-w\">\u5f15\u65702\u3064\u3001\u623b\u308a\u5024\u306e\u578b\u304cInteger<\/span><\/strong><\/p>\n<pre class=\"prettyprint lang:default decode:true\">Comparator&lt;Integer&gt; comparator0 = new Comparator&lt;Integer&gt;() {\r\n    public int compare(Integer i1, Integer i2) {\r\n        return i1.compareTo(i2);\r\n    }\r\n};\r\nComparator&lt;Integer&gt; comparator1 = (Integer i1, Integer i2) -&gt; {return i1.compareTo(i2);};\r\nComparator&lt;Integer&gt; comparator2 = (i1, i2) -&gt; i1.compareTo(i2);\r\n\/\/ \u2193\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3001\u578b\u3092\u66f8\u304f\u306a\u3089\u3001\u3059\u3079\u3066\u306e\u5f15\u6570\u306b\u66f8\u304b\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\r\nComparator&lt;Integer&gt; comparator3 = (Ingeter i1, i2) -&gt; i1.compareTo(i2);<\/pre>\n<p><strong><span class=\"f-marker-w\">\u5f15\u65701\u3064\u3001\u623b\u308a\u5024\u306e\u578b\u304cInteger\u3001\u30e1\u30bd\u30c3\u30c9\u672c\u4f53\u304c\u8907\u6570\u884c<\/span><\/strong><\/p>\n<pre class=\"prettyprint lang:default decode:true\">Function&lt;String, Integer&gt; function0 = new Function&lt;String, Integer&gt;() {\r\n    public Integer apply(String s) {\r\n        if (\"ABC\".equals(s)) {\r\n            return 1;\r\n        } else {\r\n            return 0;\r\n        }\r\n    }\r\n};\r\nFunction&lt;String, Integer&gt; function1 = (String s) -&gt; {\r\n    if (\"ABC\".equals(s)) {\r\n        return 1;\r\n    } else {\r\n        return 0;\r\n    }\r\n};\r\nFunction&lt;String, Integer&gt; function2 = (s) -&gt; {\r\n    if (\"ABC\".equals(s)) {\r\n        return 1;\r\n    } else {\r\n        return 0;\r\n    }\r\n};\r\nFunction&lt;String, Integer&gt; function3 = s -&gt; {\r\n    if (\"ABC\".equals(s)) {\r\n        return 1;\r\n    } else {\r\n        return 0;\r\n    }\r\n};<\/pre>\n<h3><span id=\"i-8\">\uff13-\uff12\uff0e\u30e9\u30e0\u30c0\u5f0f\u306e\u4e2d\u3067\u4f7f\u3048\u308b\u5909\u6570<\/span><\/h3>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306e\u30e1\u30bd\u30c3\u30c9\u672c\u4f53\u3067\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u672c\u4f53\u5185\u3067\u5ba3\u8a00\u3057\u305f\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3084\u5f15\u6570\u4ee5\u5916\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u5909\u6570\u3092\u4f7f\u3048\u307e\u3059\u3002\u5c11\u3057\u96e3\u3057\u3044\u306e\u306f\u300c\u5b9f\u8cea\u7684<span>final(effectively final)<\/span>\u306a\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u300d\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u30af\u30e9\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9<span>(<\/span>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9<span>\/<\/span>\u30af\u30e9\u30b9\u30d5\u30a3\u30fc\u30eb\u30c9<span>)<\/span><\/li>\n<li>\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u3046\u3061\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u524d\u3067\u5ba3\u8a00\u6e08\u3067\u3001\u5b9f\u8cea\u7684<span>final<\/span>\u307e\u305f\u306f<span>final<\/span>\u3067\u3042\u308b\u3082\u306e<\/li>\n<\/ul>\n<h4>\uff13-\uff12-\uff11\uff0e\u5b9f\u8cea\u7684<span>final<\/span>\u306a\u30ed\u30fc\u30ab\u30eb\u5909\u6570<\/h4>\n<p>Java\u3067\u306e\u5909\u6570\u3078\u306e<span>final<\/span>\u4fee\u98fe\u5b50\u3068\u306f\u4f55\u304b\u3092\u5fa9\u7fd2\u3057\u307e\u3057\u3087\u3046\u3002\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u5909\u6570\u3067\u306f\u4ee3\u5165\u3057\u305f\u5909\u6570\u306e\u5024\u3092\u5909\u3048\u3089\u308c\u306a\u3044\u3053\u3068\u3001\u53c2\u7167\u578b\u5909\u6570\u3067\u306f\u53c2\u7167\u5148\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u5909\u3048\u3089\u308c\u306a\u3044\u3053\u3068\u3067\u3057\u305f\u306d\u3002<\/p>\n<p>\u305d\u308c\u3092\u982d\u306b\u5165\u308c\u3066\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u8aad\u3093\u3067\u304f\u3060\u3055\u3044\u3002\u3053\u306e\u30e9\u30e0\u30c0\u5f0f\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3067\u3059\u3002\u5909\u6570<span>i<\/span>\u3092\u5ba3\u8a00\u3057\u3066\u521d\u671f\u5024<span>0<\/span>\u3092\u4ee3\u5165\u3057\u305f\u5f8c\u306b\u3001<span>i<\/span>\u306e\u5024\u3092\u30e9\u30e0\u30c0\u5f0f\u306e\u4e2d\u3067\u5909\u3048\u3088\u3046\u3068\u3057\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.function.Supplier;\r\n\r\nclass LambdaTest {\r\n    public static void main(String[] args) {\r\n        int i = 0;\r\n        Supplier&lt;Integer&gt; supplier = () -&gt; {\r\n            i = i + 1; \/\/ i\u306e\u5024\u3092\u5909\u3048\u3066\u3044\u308b\u306e\u3067\u3001i\u306f\u5b9f\u8cea\u7684final\u3067\u306f\u306a\u304f\u306a\u308b\r\n            return i;\r\n        };\r\n    }\r\n}<\/pre>\n<p>\u5909\u6570\u306e\u5024\u3092\u5f8c\u304b\u3089\u5909\u3048\u3089\u308c\u3066\u3057\u307e\u3063\u3066\u306f\u3001\u5148\u307b\u3069\u306e<span>final<\/span>\u306e\u6c7a\u3081\u4e8b\u3092\u5b88\u308c\u307e\u305b\u3093\u3088\u306d\u3002\u3067\u3059\u304b\u3089\u3001\u3053\u306e\u30e9\u30e0\u30c0\u5f0f\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b\u306e\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3060\u3068\u3001\u5909\u6570<span>i<\/span>\u306f<span>final<\/span>\u3067\u306f\u306a\u3044\u3082\u306e\u306e\u3001\u30e9\u30e0\u30c0\u5f0f\u304c\u3042\u308b<span>main<\/span>\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u3067\u306f\u5024\u304c\u5909\u308f\u308a\u307e\u305b\u3093\u3002\u3067\u3059\u306e\u3067\u3001\u300c\u5b9f\u8cea\u7684\u306b\u300d<span>final<\/span>\u3068\u540c\u3058\u3060\u3068\u3001<span>Java<\/span>\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u5224\u65ad\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.function.Supplier;\r\n\r\nclass LambdaTest {\r\n    public static void main(String[] args) {\r\n        int i = 0;\r\n        Supplier&lt;Integer&gt; supplier = () -&gt; i;\r\n    }\r\n}<\/pre>\n<p>\u3067\u3082\u3001\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u30e9\u30e0\u30c0\u5f0f\u306e\u5916\u3067\u3059\u304c\u3001<span>main<\/span>\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u3067\u5909\u6570<span>i<\/span>\u306e\u5024\u304c\u5909\u308f\u3063\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u5b9f\u8cea\u7684<span>final<\/span>\u3068\u306f\u307f\u306a\u3055\u308c\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.function.Supplier;\r\n\r\nclass LambdaTest {\r\n    public static void main(String[] args) {\r\n        int i = 0;\r\n        Supplier&lt;Integer&gt; supplier = () -&gt; i;\r\n        i = 1;\r\n    }\r\n}<\/pre>\n<p>\u3082\u3061\u308d\u3093\u3001\u5b9f\u8cea\u7684\u3067\u306f\u306a\u304f\u660e\u793a\u7684\u306b\u5909\u6570\u3092<span>final<\/span>\u3068\u3057\u3066\u3082\u4f55\u3082\u554f\u984c\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u5b9f\u8cea\u7684<span>final<\/span>\u306f\u3001\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306b<span>final<\/span>\u4fee\u98fe\u5b50\u3092\u3044\u3061\u3044\u3061\u3064\u3051\u308b\u624b\u9593\u3092\u7701\u3044\u3066\u304f\u308c\u308b\u3001<span>Java<\/span>\u306e\u304a\u52a9\u3051\u6a5f\u80fd\u306a\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.function.Supplier;\r\n\r\nclass LambdaTest {\r\n    public static void main(String[] args) {\r\n        final int i = 0;\r\n        Supplier&lt;Integer&gt; supplier = () -&gt; i;\r\n    }\r\n}<\/pre>\n<h4>\uff13-\uff12-\uff12\uff0e\u30e9\u30e0\u30c0\u5f0f\u306e\u5916\u306b\u3042\u308b\u53c2\u7167\u578b\u5909\u6570\u306b\u306f\u8981\u6ce8\u610f<span>!<\/span><\/h4>\n<p>\u53c2\u7167\u578b\u5909\u6570\u306e<span>final<\/span>\u3068\u306f\u3001\u5909\u6570\u304c\u6307\u3059\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u5909\u3048\u3089\u308c\u306a\u3044\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u3067\u3059\u304b\u3089\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3059\u308b\u3068\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u4e2d\u3067\u914d\u5217\u306e\u5185\u5bb9\u3092\u66f8\u304d\u63db\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.function.Consumer;\r\n\r\nclass LambdaTest {\r\n    public static void main(String[] args) {\r\n        final int[] i = {0, 1, 2};\r\n        System.out.println(i[1]); \/\/ \u2192 1\r\n\r\n        Consumer&lt;?&gt; consumer = x -&gt; {\r\n            i[1] = 256;\r\n        };\r\n        consumer.accept(null);\r\n\r\n        System.out.println(i[1]); \/\/ \u2192 256!\r\n    }\r\n}<\/pre>\n<p>\u3053\u308c\u306f\u3001\u53c2\u7167\u578b\u5909\u6570<span>i<\/span>\u304c\u6307\u3057\u3066\u3044\u308b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u5909\u66f4\u3057\u3066\u3044\u306a\u3044\u304b\u3089\u3067\u3059\u3002<span>i<\/span>\u306f\u540c\u3058\u914d\u5217\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3057\u7d9a\u3051\u3066\u3044\u3066\u3001\u305d\u306e\u914d\u5217\u306e\u5185\u5bb9\u3092\u5909\u3048\u308b\u64cd\u4f5c\u306f\u3001<span>final<\/span>\u306b\u306f\u62b5\u89e6\u3057\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n<p>\u540c\u3058\u3088\u3046\u306b\u3001\u53c2\u7167\u578b\u5909\u6570\u306e\u578b\u306b<span>getter\/setter<\/span>\u304c\u3042\u3063\u305f\u306a\u3089\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u4e2d\u3067<span>setter<\/span>\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u306b\u306f\u4f55\u3082\u5236\u9650\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u3084\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u53c2\u7167\u306b\u306f\u5236\u9650\u306f\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u3067\u3059\u304b\u3089\u3001<span>final<\/span>\u3060\u304b\u3089\u5909\u6570\u304c\u6307\u3059\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u72b6\u614b\u304c\u5909\u308f\u3089\u306a\u3044\u3068\u3044\u3046\u308f\u3051\u3067\u306f\u306a\u3044\u306e\u3067\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u3059\u308b\u3068\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u4e2d\u3068\u5916\u3068\u3067\u3001\u9593\u63a5\u7684\u306b\u5024\u306e\u3084\u308a\u53d6\u308a\u304c\u3067\u304d\u305f\u308a\u3082\u3057\u307e\u3059\u3002<\/p>\n<p>\u3069\u3046\u3057\u3066\u3082\u3053\u3046\u66f8\u304b\u3056\u308b\u3092\u5f97\u306a\u3044\u30b1\u30fc\u30b9\u3082\u3042\u30ea\u307e\u3059\u304c\u3001\u3042\u307e\u308a\u304a\u52e7\u3081\u306f\u3055\u308c\u306a\u3044\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30bf\u30a4\u30eb\u3067\u3059\u3002\u306a\u305c\u306a\u3089\u3001\u30e9\u30e0\u30c0\u5f0f\u3067\u8868\u73fe\u3055\u308c\u308b\u300c\u95a2\u6570\u300d\u304c\u526f\u4f5c\u7528\u3092\u6301\u3064\u3053\u3068\u306b\u306a\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<h4>\uff13-\uff12-\uff13\uff0e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30d5\u30a3\u30fc\u30eb\u30c9\u30fb\u30af\u30e9\u30b9\u30d5\u30a3\u30fc\u30eb\u30c9<\/h4>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306e\u4e2d\u304b\u3089\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30d5\u30a3\u30fc\u30eb\u30c9<span>(<\/span>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570<span>)<\/span>\u3001\u30af\u30e9\u30b9\u30d5\u30a3\u30fc\u30eb\u30c9<span>(static<\/span>\u5909\u6570<span>)<\/span>\u306f\u3001\u3082\u81ea\u7531\u306b\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001\u666e\u901a\u306e\u5909\u6570\u3068\u3057\u3066\u6271\u3048\u308b\u306e\u3067\u3001\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u5909\u6570\u306f\u5024\u3092\u5909\u66f4\u3067\u304d\u307e\u3059\u3057\u3001\u53c2\u7167\u578b\u5909\u6570\u306f\u53c2\u7167\u5148\u3092\u5909\u3048\u3089\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u30e9\u30e0\u30c0\u5f0f\u306f\u3001\u3044\u305a\u308c\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u306f\u901a\u308a\u3001\u5b9f\u884c\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.function.Supplier;\r\n\r\nclass LambdaTest {\r\n    int i = 0;\r\n    static j = 256:\r\n\r\n    String s1 = \"ABC\";\r\n    static String s2 = \"\u3042\u3044\u3046\u3048\u304a\";\r\n\r\n    void instanceMethod() {\r\n        Supplier&lt;Integer&gt; supplier1 = () -&gt; ++i;\r\n        Supplier&lt;Integer&gt; supplier2 = () -&gt; ++j;\r\n        Supplier&lt;String&gt; supplier3 = () -&gt; s1 += \"EDF\";\r\n        Supplier&lt;String&gt; supplier4 = () -&gt; s2 += \"\u304b\u304d\u304f\u3051\u3053\";\r\n    }\r\n\r\n    public static void main(String[] args) {\r\n        new LambdaTest().instanceMethod();\r\n    }\r\n}<\/pre>\n<p>\u6ce8\u610f\u3057\u305f\u3044\u306e\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30fb\u30af\u30e9\u30b9\u30d5\u30a3\u30fc\u30eb\u30c9\u3078\u306f\u30e9\u30e0\u30c0\u5f0f\u306e\u5916\u3067\u4e88\u671f\u305b\u306c\u5909\u66f4\u304c\u884c\u308f\u308c\u3046\u308b\u3053\u3068\u3001\u307e\u305f\u30e9\u30e0\u30c0\u5f0f\u306e\u4e2d\u3067\u306e\u5909\u6570\u64cd\u4f5c\u306b\u3088\u308a\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u5916\u3078\u3082\u5f71\u97ff\u3092\u53ca\u307c\u3057\u3046\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u30e9\u30e0\u30c0\u5f0f\u3067\u751f\u6210\u3057\u305f<span>1<\/span>\u3064\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u3001\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u4e0b\u3067\u52d5\u304f\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002\u3067\u3059\u304b\u3089\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u3078\u30a2\u30af\u30bb\u30b9\u3059\u308b\u969b\u306b\u540c\u671f\u30d6\u30ed\u30c3\u30af\u306a\u3069\u3067\u306e\u4fdd\u8b77\u304c\u5fc5\u8981\u306a\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u5f8c\u8ff0\u3057\u307e\u3059\u304c\u3001\u30e9\u30e0\u30c0\u5f0f\u306f\u90e8\u54c1\u306e\u3088\u3046\u306b\u4f7f\u308f\u308c\u308b\u305b\u3044\u3067\u3001\u3044\u308d\u3044\u308d\u306a\u30b7\u30c1\u30e5\u30a8\u30fc\u30b7\u30e7\u30f3\u306e\u4e0b\u3067\u4f7f\u308f\u308c\u3046\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<h4>\uff13-\uff12-\uff14\uff0e\u3010\u53c2\u8003\u3011\u306a\u305c\u30e9\u30e0\u30c0\u5f0f\u3067\u53c2\u7167\u3067\u304d\u308b\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306f<span>final<\/span>\u3060\u3051\u306a\u306e\u304b<\/h4>\n<p>Java\u306e\u30e9\u30e0\u30c0\u5f0f\u306e\u4e2d\u3067\u53c2\u7167\u3059\u308b\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306f\u3001\u306a\u305c<span>(<\/span>\u5b9f\u8cea\u7684<span>)final<\/span>\u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u306e\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u305d\u308c\u3092\u304a\u4f1d\u3048\u3059\u308b\u306b\u306f\u3001<span>Java<\/span>\u4eee\u60f3\u30de\u30b7\u30f3\u304c\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u30fb\u53c2\u7167\u578b\u5909\u6570\u30fb\u30b9\u30ec\u30c3\u30c9\u3092\u3069\u3046\u7ba1\u7406\u3057\u3066\u3044\u308b\u304b\u3001\u30d2\u30fc\u30d7\u3068\u30b9\u30bf\u30c3\u30af\u306e\u4f7f\u308f\u308c\u65b9\u306e\u9055\u3044\u306a\u3069\u3001<span>Java<\/span>\u4eee\u60f3\u30de\u30b7\u30f3\u306e\u52d5\u304d\u306b\u5c11\u306a\u304b\u3089\u305a\u89e6\u308c\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u305d\u306e\u5185\u5bb9\u306f\u3053\u306e\u8a18\u4e8b\u306e\u7bc4\u56f2\u3092\u8d85\u3048\u307e\u3059\u306e\u3067\u3001\u8a73\u7d30\u306b\u306f\u89e6\u308c\u307e\u305b\u3093\u3002\u305d\u3053\u306b\u305f\u3069\u308a\u7740\u304f\u305f\u3081\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u300c\u30af\u30ed\u30fc\u30b8\u30e3<span>(closure<\/span>\u3001\u95a2\u6570\u9589\u5305<span>)<\/span>\u300d\u3084\u300c\u5909\u6570\u306e\u675f\u7e1b<span>(binding)<\/span>\u300d\u306a\u3069\u3067\u3059\u3002\u8208\u5473\u304c\u3042\u308c\u3070\u8abf\u3079\u3066\u307f\u3066\u3082\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<h3><span id=\"i-9\">\uff13-\uff13\uff0e\u30e9\u30e0\u30c0\u5f0f\u3068\u30aa\u30fc\u30c8\u30dc\u30af\u30b7\u30f3\u30b0\u30fb\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u62e1\u5927\u5909\u63db<\/span><\/h3>\n<p>\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u3046\u4e0a\u3067\u306f\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306e\u578b\u30fb\u623b\u308a\u5024\u306e\u578b\u3078\u884c\u308f\u308c\u308b\u30aa\u30fc\u30c8\u30dc\u30af\u30b7\u30f3\u30b0\u3068\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u62e1\u5927\u5909\u63db\u306b\u3064\u3044\u3066\u3001\u5c11\u3005\u6ce8\u610f\u3059\u308b\u4e8b\u67c4\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30aa\u30fc\u30c8\u30dc\u30af\u30b7\u30f3\u30b0<span>(autoboxing)<\/span>\u3068\u306f\u3001<span>int<\/span>\u3068<span>Integer<\/span>\u3001<span>long<\/span>\u3068<span>Long<\/span>\u306e\u3088\u3046\u306b\u3001\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u3068\u5bfe\u5fdc\u3059\u308b\u30af\u30e9\u30b9\u306e\u9593\u3067\u81ea\u52d5\u7684\u306b\u76f8\u4e92\u5909\u63db\u304c\u884c\u308f\u308c\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u62e1\u5927\u5909\u63db<span>(widening primitive conversion)<\/span>\u3068\u306f\u3001<span>int<\/span>\u304b\u3089<span>long<\/span>\u3001<span>long<\/span>\u304b\u3089<span>double<\/span>\u306a\u3069\u3001\u3088\u308a\u5e83\u3044\u5024\u306e\u7bc4\u56f2\u306e\u578b\u3078\u306a\u3089\u3001\u5909\u63db\u5148\u306e\u578b\u3078\u306e\u660e\u793a\u7684\u306a\u30ad\u30e3\u30b9\u30c8\u304c\u3044\u3089\u306a\u3044\u3082\u306e\u3067\u3059\u3002<\/p>\n<h4>\uff13-\uff13-\uff11\uff0e\u5f15\u6570\u306f\u30aa\u30fc\u30c8\u30dc\u30af\u30b7\u30f3\u30b0\u3055\u308c\u306a\u3044<\/h4>\n<p>\u30e9\u30e0\u30c0\u5f0f\u3067\u306f\u5f15\u6570\u306f\u30aa\u30fc\u30c8\u30dc\u30af\u30b7\u30f3\u30b0\u3055\u308c\u307e\u305b\u3093\u306e\u3067\u3001\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u3068\u5bfe\u5fdc\u3059\u308b\u30af\u30e9\u30b9\u306f\u7570\u306a\u308b\u578b\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u3001<span>java.util.function.Consumer&lt;T&gt;<\/span>\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u5ba3\u8a00\u306f\u300c<span>void accept(T t)<\/span>\u300d\u3001<span>java.util.function.IntConsumer<\/span>\u306f\u300c<span>void accept(int value)<\/span>\u300d\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Consumer&lt;Integer&gt; c1 = (int i) -&gt; System.out.println(i);\r\nConsumer&lt;Integer&gt; c2 = (Integer i) -&gt; System.out.println(i);\r\nIntConsumer c3 = (int i) -&gt; System.out.println(i);\r\nIntConsumer c4 = (Integer i) -&gt; System.out.println(i);<\/pre>\n<p>\u3053\u308c\u3089\u306e\u30e9\u30e0\u30c0\u5f0f\u3067\u306f\u3001<span>c2<\/span>\u3068<span>c3<\/span>\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308a\u3001<span>c1<\/span>\u3068<span>c4<\/span>\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3067\u3059\u3002\u306a\u305c\u306a\u3089\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u5f15\u6570\u306b\u304a\u3044\u3066\u306f\u3001<span>Integer<\/span>\u3068<span>int<\/span>\u306f\u9055\u3046\u30e2\u30ce\u3060\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u7406\u89e3\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u3089\u306f\u3001<span>Java<\/span>\u3067\u306f\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3055\u308c\u305f\u5225\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u6271\u308f\u308c\u308b\u3068\u3044\u3046\u4ed5\u69d8\u304c\u5206\u304b\u3063\u3066\u3044\u308c\u3070\u3001\u7d0d\u5f97\u3067\u304d\u308b\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">void method(int i) {\r\n    System.out.println(i);\r\n}\r\n\r\nvoid method(Integer i) {\r\n    System.out.println(i);\r\n}<\/pre>\n<h4>\uff13-\uff13-\uff12\uff0e\u623b\u308a\u5024\u3067\u3082\u6ce8\u610f\u306f\u5fc5\u8981<\/h4>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306e\u623b\u308a\u5024\u3067\u3082\u3001\u30aa\u30fc\u30c8\u30dc\u30af\u30b7\u30f3\u30b0\u3068\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u62e1\u5927\u5909\u63db\u3092\u610f\u8b58\u3059\u3079\u304d\u30b1\u30fc\u30b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u3001<span>java.util.function.Supplier&lt;T&gt;<\/span>\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u5ba3\u8a00\u306f\u300c<span>T get()<\/span>\u300d\u3001<span>java.util.function.Predicate&lt;T&gt;<\/span>\u306f\u300c<span>boolean test(T t)<\/span>\u300d\u3001<span>java.util.LongSupplier<\/span>\u306f\u300c<span>long getAsLong()<\/span>\u300d\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Supplier&lt;Integer&gt; s1 = () -&gt; 100;\r\nSupplier&lt;Integer&gt; s2 = () -&gt; Integer.valueOf(100);\r\nSupplier&lt;Long&gt; s3 = () -&gt; 100;\r\nSupplier&lt;Long&gt; s4 = () -&gt; Integer.valueOf(100);\r\nPredicate&lt;String&gt; p = s -&gt; Boolean.valueOf(true);\r\nLongSupplier ls1 = () -&gt; 100;\r\nLongSupplier ls2 = () -&gt; Integer.valueOf(100);<\/pre>\n<p>s3\u3001<span>s4<\/span>\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3067\u3059\u3002\u305d\u308c\u4ee5\u5916\u306e\u884c\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f\u3001\u4ee5\u4e0b\u3092\u3084\u3063\u3066\u3044\u308b\u306e\u3060\u3068\u8003\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u4ee5\u4e0b\u3067<span>l1<\/span>\u306e\u884c\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b\u306e\u306f\u3001\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u2192\u53c2\u7167\u578b\u306e\u30aa\u30fc\u30c8\u30dc\u30af\u30b7\u30f3\u30b0\u3067\u306f\u578b\u5909\u63db\u304c\u884c\u308f\u308c\u306a\u3044\u30b1\u30fc\u30b9\u304c\u3042\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Integer i1 = 100; \/\/ \u30aa\u30fc\u30c8\u30dc\u30af\u30b7\u30f3\u30b0(int\u2192Integer)\r\nInteger i2 = Integer.valueOf(100); \/\/ \u30af\u30e9\u30b9\u304c\u540c\u3058(Integer\u540c\u58eb)\r\nLong l1 = 100; \/\/ NG:int\u306fLong\u3078\u306f\u30aa\u30fc\u30c8\u30dc\u30af\u30b7\u30f3\u30b0\u3055\u308c\u306a\u3044\r\nLong l2 = Integer.valueOf(100); \/\/ NG:Integer\u3068Long\u306f\u9055\u3046\u30af\u30e9\u30b9\u306a\u306e\u3067\u4e92\u63db\u6027\u304c\u306a\u3044\r\nboolean b = Boolean.valueOf(true); \/\/ \u30aa\u30fc\u30c8\u30dc\u30af\u30b7\u30f3\u30b0(Boolean\u2192boolean)\r\nlong l3 = 100; \/\/ \u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u62e1\u5927\u5909\u63db(int\u2192long)\r\nlong l4 = Integer.valueOf(100); \/\/ \u30aa\u30fc\u30c8\u30dc\u30af\u30b7\u30f3\u30b0+\u62e1\u5927\u5909\u63db(Integer\u2192int\u2192long)<\/pre>\n<p>\u3067\u3059\u306e\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30ad\u30e3\u30b9\u30c8\u3092\u660e\u793a\u7684\u306b\u884c\u3048\u3070\u3001<span>s3<\/span>\u3068<span>s4<\/span>\u3067\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Supplier&lt;Long&gt; s3 = () -&gt; (long)100;\r\nSupplier&lt;Long&gt; s4 = () -&gt; (long)Integer.valueOf(100);<\/pre>\n<h3><span id=\"i-10\">\uff13-\uff14\uff0e\u30e9\u30e0\u30c0\u5f0f\u3068\u4f8b\u5916<\/span><\/h3>\n<p>\u30e9\u30e0\u30c0\u5f0f\u3067\u751f\u6210\u3055\u308c\u308b\u30af\u30e9\u30b9\u306f\u3001\u30af\u30e9\u30b9\u306e\u5b9a\u7fa9\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u304c\u30e9\u30e0\u30c0\u5f0f\u304c\u8a55\u4fa1\u3055\u308c\u305f\u6642\u3068\u3044\u3046\u3060\u3051\u306a\u306e\u3067\u3001\u666e\u901a\u306b\u5b9a\u7fa9\u3055\u308c\u305f\u30af\u30e9\u30b9\u3068\u6bd4\u3079\u3066\u3082\u3001\u6a5f\u80fd\u3068\u3057\u3066\u306f\u540c\u3058\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u3067\u3059\u304b\u3089\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306b<span>throws<\/span>\u53e5\u304c\u3042\u308b\u306a\u3089\u3001\u30e9\u30e0\u30c0\u5f0f\u3067\u751f\u6210\u3057\u305f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3067\u767a\u751f\u3057\u305f\u4f8b\u5916\u306f\u305d\u306e\u307e\u307e<span>throw<\/span>\u3067\u304d\u307e\u3059\u3002<span>Java<\/span>\u306e\u6587\u6cd5\u3069\u304a\u308a\u3067\u3059\u306d\u3002<\/p>\n<p><strong><span class=\"f-marker-p\">AutoCloseable\u306e\u5b9a\u7fa9<\/span><\/strong><\/p>\n<pre class=\"prettyprint lang:default decode:true\">package java.lang;\r\n\r\npublic interface AutoCloseable {\r\n    void close() throws Exception;\r\n}<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \u30e9\u30e0\u30c0\u5f0f\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3057\u305f\u6642\u70b9\u3067\u306fException\u306fthrow\u3055\u308c\u305a\u3001\r\nAutoCloseable c = () -&gt; {throw new Exception();};\r\n\/\/ \u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u3001Exception\u304cthrow\u3055\u308c\u308b\r\nc.close();<\/pre>\n<p>\u3067\u3059\u304b\u3089\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u305f\u6642\u306b\u767a\u751f\u3057\u305f\u4f8b\u5916\u304c\u3069\u3046\u6271\u308f\u308c\u308b\u304b\u306f\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u3069\u3046\u547c\u3073\u51fa\u3059\u304b\u306b\u3088\u308a\u307e\u3059\u3002\u5f53\u305f\u308a\u524d\u3068\u8a00\u3048\u3070\u5f53\u305f\u308a\u524d\u3067\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e<span>method2<\/span>\u3068<span>method5<\/span>\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b\u7406\u7531\u306f\u5206\u304b\u308b\u3067\u3057\u3087\u3046\u304b\u3002\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u3067\u767a\u751f\u3057\u3046\u308b<span>Exception<\/span>\u3092\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u3067<span>catch<\/span>\u3082<span>throw<\/span>\u3082\u3057\u3066\u3044\u306a\u3044\u304b\u3089\u3067\u3059\u306d\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">void method1() throws Exception {\r\n    AutoCloseable c = () -&gt; {throw new Exception();};\r\n    c.close();\r\n}\r\n\r\nvoid method2() {\r\n    AutoCloseable c = () -&gt; {throw new Exception();};\r\n    c.close();\r\n}\r\n\r\nvoid method3() {\r\n    AutoCloseable c = () -&gt; {throw new Exception();};\r\n}\r\n\r\nvoid method4(AutoCloseable c) throws Exception {\r\n    c.close();\r\n}\r\n\r\nvoid method5(AutoCloseable c) {\r\n    c.close();\r\n}<\/pre>\n<p>\u3067\u3059\u306e\u3067\u3001\u30e9\u30e0\u30c0\u5f0f\u3067\u3042\u3063\u3066\u3082\u3001\u4f8b\u5916\u3092\u6271\u3046\u4e0a\u3067\u306f\u4f55\u3082\u7279\u5225\u306a\u3053\u3068\u306f\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n<h3><span id=\"i-11\">\uff13-\uff15\uff0e\u30e9\u30e0\u30c0\u5f0f\u3068\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7<\/span><\/h3>\n<p>\u3053\u3053\u307e\u3067\u898b\u3066\u304d\u305f\u3068\u304a\u308a\u3001\u30e9\u30e0\u30c0\u5f0f\u3068\u533f\u540d\u30af\u30e9\u30b9\u306f\u307b\u307c\u540c\u3058\u8003\u3048\u65b9\u304c\u3067\u304d\u307e\u3059\u3002\u3067\u3059\u304c\u3001<span>this<\/span>\u304c\u6307\u3059\u3082\u306e\u3068\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7\u306a\u3069\u306e\u9055\u3044\u3082\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u305d\u308c\u3089\u3092\u7c21\u5358\u306b\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h4>\uff13-\uff15-\uff11\uff0ethis\u304c\u6307\u3059\u3082\u306e\u304c\u9055\u3046<\/h4>\n<p>Java\u3067\u306e<span>this<\/span>\u306f\u3001\u81ea\u5206\u81ea\u8eab\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3059\u3082\u306e\u3067\u3059\u3002\u3053\u3053\u3067\u30e9\u30e0\u30c0\u5f0f\u3068\u533f\u540d\u30af\u30e9\u30b9\u306e<span>this<\/span>\u306f\u3001\u6307\u3057\u3066\u3044\u308b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u9055\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class LambdaTest {\r\n    public static void main(String[] args) {\r\n        new LambdaTest().instanceMethod();\r\n    }\r\n\r\n    void instanceMethod() {\r\n        System.out.println(\"\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3067\u306ethis: \" + System.identityHashCode(this));\r\n\r\n        Runnable r1 = () -&gt; System.out.println(\"\u30e9\u30e0\u30c0\u5f0f\u3067\u306ethis: \" + System.identityHashCode(this));\r\n        r1.run();\r\n\r\n        Runnable r2 = new Runnable() {\r\n            public void run() {\r\n                System.out.println(\"\u533f\u540d\u30af\u30e9\u30b9\u3067\u306ethis: \" + System.identityHashCode(this));\r\n            }\r\n        };\r\n        r2.run();\r\n    }\r\n}<\/pre>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306e<span>this<\/span>\u306f\u30e9\u30e0\u30c0\u5f0f\u3092\u4f5c\u3063\u305f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3059\u306e\u3067\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u5185\u306e<span>this<\/span>\u3068\u540c\u3058\u3067\u3059\u3002\u533f\u540d\u30af\u30e9\u30b9\u306e<span>this<\/span>\u306f\u3001\u533f\u540d\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u81ea\u8eab\u3067\u3059\u3002\u7d50\u679c\u3082\u305d\u3046\u306a\u3063\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3067\u306ethis: 1392838282\r\n\u30e9\u30e0\u30c0\u5f0f\u3067\u306ethis: 1392838282\r\n\u533f\u540d\u30af\u30e9\u30b9\u3067\u306ethis: 1325547227<\/pre>\n<p>\u3067\u3059\u304b\u3089\u3001<span>static<\/span>\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u66f8\u3044\u305f\u30e9\u30e0\u30c0\u5f0f\u3067\u306f\u3001<span>this<\/span>\u3092\u4f7f\u3048\u307e\u305b\u3093\u3002\u306a\u305c\u306a\u3089\u3001<span>static<\/span>\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u3067\u306f<span>this<\/span>\u304c\u4f7f\u3048\u306a\u3044\u304b\u3089\u3067\u3059\u3002\u3067\u3082\u3001\u533f\u540d\u30af\u30e9\u30b9\u306e<span>this<\/span>\u306f\u5f53\u7136\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class LambdaTest {\r\n    public static void main(String[] args) {\r\n        \/\/ \u2193\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3002static\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u306fthis\u306f\u4f7f\u3048\u306a\u3044\u305f\u3081\r\n        Runnable r1 = () -&gt; System.out.println(\"\u30e9\u30e0\u30c0\u5f0f\u3067\u306ethis:\" + this);\r\n        r1.run();\r\n\r\n        \/\/ \u2193\u306fthis\u3092\u4f7f\u3048\u308b\u3002this\u304c\u533f\u540d\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3059\u305f\u3081\r\n        Runnable r2 = new Runnable() {\r\n            public void run() {\r\n                System.out.println(\"\u533f\u540d\u30af\u30e9\u30b9\u3067\u306ethis:\" + this);\r\n            }\r\n        };\r\n        r2.run();\r\n    }\r\n}<\/pre>\n<h4>\uff13-\uff15-\uff12\uff0e\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7\u304c\u9055\u3046<\/h4>\n<p>\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u3001\u30e9\u30e0\u30c0\u5f0f\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308a\u3001\u533f\u540d\u30af\u30e9\u30b9\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.function.Consumer;\r\n\r\nclass LambdaTest {\r\n    public static void main(String[] args) {\r\n        String s = \"ABC\";\r\n\r\n        Consumer&lt;String&gt; c1 = s -&gt; System.out.println(s);\r\n\r\n        Consumer&lt;String&gt; c2 = new Consumer&lt;String&gt;() {\r\n            public void accept(String s) {\r\n                System.out.println(s);\r\n            }\r\n        };\r\n    }\r\n}<\/pre>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306e\u5f15\u6570\u90e8\u306e\u30b9\u30b3\u30fc\u30d7\u306f\u3001\u30e9\u30e0\u30c0\u5f0f\u304c\u66f8\u304b\u308c\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9\u306e\u30b9\u30b3\u30fc\u30d7\u306b\u5c5e\u3057\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u524d\u3067<span>s<\/span>\u3068\u3044\u3046\u5909\u6570\u304c\u5ba3\u8a00\u6e08\u306a\u306e\u3067\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e00\u65b9\u3001\u533f\u540d\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306e\u5909\u6570\u540d\u306f\u3001\u533f\u540d\u30af\u30e9\u30b9\u304c\u66f8\u304b\u308c\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9\u306e\u30b9\u30b3\u30fc\u30d7\u306b\u306f\u5c5e\u3057\u307e\u305b\u3093\u3002\u3067\u3059\u306e\u3067\u3001\u540c\u3058\u5909\u6570\u540d\u3067\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u306a\u304a\u3001<span>Java<\/span>\u306b\u306f\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u5909\u6570\u540d\u306f\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5909\u6570\u540d\u3088\u308a\u512a\u5148\u3055\u308c\u308b\u30eb\u30fc\u30eb\u304c\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30d5\u30a3\u30fc\u30eb\u30c9\u3068\u5f15\u6570\u306e\u5909\u6570\u540d\u304c\u540c\u3058\u306a\u3089\u3001\u5f15\u6570\u304c\u512a\u5148\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.function.Consumer;\r\n\r\nclass LambdaTest {\r\n    static String s = \"ABC\";\r\n\r\n    public static void main(String[] args) {\r\n        Consumer&lt;String&gt; c = s -&gt; System.out.println(s);\r\n        c.accept(\"\u3042\u3044\u3046\u3048\u304a\"); \/\/ \u2192 \"\u3042\u3044\u3046\u3048\u304a\"\r\n    }\r\n}<\/pre>\n<p>\u3061\u306a\u307f\u306b\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u5f8c\u308d\u3067\u306a\u3089\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u5f15\u6570\u306b\u4f7f\u3063\u305f\u5909\u6570\u540d\u3092\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.function.Consumer;\r\n\r\nclass LambdaTest {\r\n    public static void main(String[] args) {\r\n        Consumer&lt;String&gt; c = s -&gt; System.out.println(s);\r\n        String s = \"ABC\";\r\n    }\r\n}<\/pre>\n<h2><span id=\"JAVA-4\">\uff14\uff0e\u3010JAVA\u3011\u30e9\u30e0\u30c0\u5f0f\u306e\u4f7f\u308f\u308c\u65b9<\/span><\/h2>\n<h3><span id=\"-Stream_API\">\uff14-\uff11\uff0eStream API\u306e\u5f15\u6570<\/span><\/h3>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306e\u4e3b\u306a\u7528\u9014\u306f<span>Stream API<\/span>\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3067\u3059\u3002\u305d\u3082\u305d\u3082\u3001\u30e9\u30e0\u30c0\u5f0f\u304c\u5c0e\u5165\u3055\u308c\u305f\u4e3b\u306a\u76ee\u7684\u306f\u3001<span>Stream API<\/span>\u306e\u5404\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3068\u306a\u308b\u300c\u95a2\u6570\u300d\u3092\u7c21\u5358\u306b\u77ed\u304f\u66f8\u304f\u305f\u3081\u306a\u306e\u3067\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u3001\u95a2\u6570\u3068\u30ab\u30c3\u30b3\u3064\u3051\u3066\u8a00\u3063\u3066\u3044\u307e\u3059\u304c\u3001<span>Stream API<\/span>\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3068\u306a\u308b\u306e\u306f\u3001\u5358\u306a\u308b\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3057\u304b\u306a\u304f\u3001\u7279\u5225\u306a\u4f55\u304b\u3067\u306f\u6c7a\u3057\u3066\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001\u4ee5\u4e0b\u306e\u4e8c\u3064\u3067\u3084\u3063\u3066\u3044\u308b\u3053\u3068\u306f\u540c\u3058\u3067\u3059\u304c\u3001\u5b9f\u969b\u306b\u306f\u524d\u8005\u306e\u66f8\u304d\u65b9\u3092\u898b\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u540c\u3058\u3053\u3068\u3092\u306f\u308b\u304b\u306b\u77ed\u304f\u66f8\u3051\u308b\u306e\u306b\u3001\u308f\u3056\u308f\u3056\u8907\u96d1\u3067\u9577\u304f\u66f8\u304d\u305f\u3044\u4eba\u306f\u3044\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Predicate&lt;String&gt; predicate = new Predicate&lt;String&gt;() {\r\n    public boolean test(String s) {\r\n        return s.startsWith(\"A\");\r\n    }\r\n};\r\nFunction&lt;String, String&gt; function = new Function&lt;String, String&gt;() {\r\n    public String apply(String s) {\r\n        return s.toLowerCase();\r\n    }\r\n};\r\nConsumer&lt;String&gt; consumer = new Consumer&lt;String&gt;() {\r\n    public void accept(String s) {\r\n        System.out.println(s);\r\n    }\r\n};\r\nList&lt;String&gt; list = Arrays.asList(\"AA\", \"AB\", \"BC\");\r\nlist.stream().filter(predicate).map(function).forEach(consumer);<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;String&gt; list = Arrays.asList(\"AA\", \"AB\", \"BC\");\r\nlist.stream()\r\n    .filter(s -&gt; s.startsWith(\"A\"))\r\n    .map(s -&gt; s.toLowerCase())\r\n    .forEach(s -&gt; System.out.println(s));<\/pre>\n<h4>\uff14-\uff11-\uff11\uff0eStream API\u3067\u306f\u3001\u306a\u305c\u30e9\u30e0\u30c0\u5f0f\u304c\u63a8\u5968\u3055\u308c\u308b\u306e\u304b<span>?<\/span><\/h4>\n<p>Stream API\u3067\u306f\u3001\u30e9\u30e0\u30c0\u5f0f\u3092\u591a\u7528\u3057\u305f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30bf\u30a4\u30eb\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002\u306a\u305c\u306a\u3089\u3001\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u3046\u3053\u3068\u3067\u4ee5\u4e0b\u306e\u52b9\u679c\u304c\u898b\u8fbc\u3081\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u3084\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u898b\u3066\u3059\u3050\u308f\u304b\u308b\u306e\u3067\u3001\u53ef\u8aad\u6027\u304c\u5411\u4e0a\u3059\u308b<\/li>\n<li>\u4e00\u3064\u4e00\u3064\u306e\u30e9\u30e0\u30c0\u5f0f\u3067\u884c\u3046\u51e6\u7406\u306f\u6bd4\u8f03\u7684\u30b7\u30f3\u30d7\u30eb\u306b\u306a\u308b\u306e\u3067\u3001\u51e6\u7406\u5168\u4f53\u306e\u610f\u56f3\u304c\u63b4\u307f\u3084\u3059\u304f\u306a\u308b<\/li>\n<\/ul>\n<p>\u306a\u304a\u3001<span>Java<\/span>\u3067\u306e\u30e9\u30e0\u30c0\u5f0f\u306e\u672c\u8cea\u306f\u3001\u305a\u3063\u3068\u304a\u4f1d\u3048\u3057\u3066\u304d\u305f\u3068\u304a\u308a\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u7c21\u5358\u306b\u751f\u6210\u3059\u308b\u3053\u3068\u3001\u305f\u3060\u305d\u308c\u3060\u3051\u3067\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u3082\u30e9\u30e0\u30c0\u5f0f\u304c\u5206\u304b\u308a\u3065\u3089\u3044\u3068\u601d\u308f\u308c\u3066\u3057\u307e\u3046\u306e\u306f\u3001<span>Stream API<\/span>\u306e\u6587\u8108\u3067<span>Stream<\/span>\u306e\u8003\u3048\u65b9\u3068\u4e00\u7dd2\u306b\u30e9\u30e0\u30c0\u5f0f\u3092\u8aac\u660e\u3057\u3088\u3046\u3068\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u78ba\u304b\u306b\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u4e3b\u306a\u5c0e\u5165\u76ee\u7684\u306f\u3001<span>Stream API<\/span>\u3067\u7528\u3044\u308b\u3053\u3068\u3067\u3059\u3002\u3057\u304b\u3057\u305d\u306e\u76ee\u7684\u3068\u3001\u30e9\u30e0\u30c0\u5f0f\u304c\u5b9f\u73fe\u3057\u3066\u3044\u308b\u3053\u3068\u306e\u672c\u8cea\u3068\u3092\u3001\u6df7\u540c\u3059\u3079\u304d\u3067\u306f\u306a\u3044\u3068\u611f\u3058\u307e\u3059\u3002<\/p>\n<h3><span id=\"-APIRunnableCallable\">\uff14-\uff12\uff0e\u30b9\u30ec\u30c3\u30c9\u95a2\u9023<span>API<\/span>\u3067\u306e<span>Runnable\/Callable<\/span><\/span><\/h3>\n<p>Stream API\u4ee5\u5916\u3067\u3088\u304f\u4f7f\u308f\u308c\u308b\u30e9\u30e0\u30c0\u5f0f\u306f\u3001\u30b9\u30ec\u30c3\u30c9\u95a2\u9023\u306e<span>Runnable<\/span>\u3068<span>Callable<\/span>\u306b\u5bfe\u3059\u308b\u3082\u306e\u3067\u3057\u3087\u3046\u3002\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u611f\u3058\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Runnable r = () -&gt; System.out.println(\"Runnable!\");\r\nThread t1 = new Thread(r);\r\nThread t2 = new Thread(r);\r\nt1.start();\r\nt2.start();<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">ExecutorService es = Executors.newFixedThreadPool(2);\r\nFuture&lt;?&gt; f1 = es.submit(() -&gt; System.out.println(\"Runnable!\"));\r\nFuture&lt;String&gt; f2 = es.submit(() -&gt; \"Callable!\");\r\nf1.get();\r\nSystem.out.println(f2.get());\r\nes.shutdown();<\/pre>\n<p>\u30b9\u30ec\u30c3\u30c9\u3067\u884c\u3044\u305f\u3044\u51e6\u7406\u304c\u77ed\u3051\u308c\u3070\u3001\u3053\u306e\u3088\u3046\u306b\u3084\u308a\u305f\u3044\u3053\u3068\u3092<span>1<\/span>\u884c\u3067\u66f8\u3051\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u533f\u540d\u30af\u30e9\u30b9\u3067\u3082\u305d\u3053\u305d\u3053\u77ed\u304f\u66f8\u3051\u307e\u3059\u304c\u3001<span>Java 8<\/span>\u4ee5\u964d\u306a\u3089\u3001\u6700\u3082\u77ed\u304f\u7c21\u6f54\u306b\u66f8\u3051\u308b\u306e\u306f\u30e9\u30e0\u30c0\u5f0f\u3067\u3059\u3002<\/p>\n<h3><span id=\"i-12\">\uff14-\uff13\uff0e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u52d5\u4f5c\u30ab\u30b9\u30bf\u30de\u30a4\u30ba<\/span><\/h3>\n<p>Java 8\u3067\u306f\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3068\u3057\u3066\u65b0\u3057\u3044\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304c\u305f\u304f\u3055\u3093\u8ffd\u52a0\u3055\u308c\u3001\u524d\u304b\u3089\u3042\u3063\u305f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u591a\u304f\u3082\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3068\u3057\u3066\u660e\u78ba\u306b\u6307\u5b9a\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<p>\u305d\u308c\u3089\u306e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306b\u306f\u3001\u5927\u5909\u306a\u6570\u306e<span>static\/default<\/span>\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u591a\u304f\u306f\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u52d5\u4f5c\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b\u305f\u3081\u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001\u305d\u306e\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u306b\u3082\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u4f7f\u3046\u3053\u3068\u304c\u307b\u3068\u3093\u3069\u3067\u3059\u306e\u3067\u3001\u305d\u3053\u3067\u30e9\u30e0\u30c0\u5f0f\u306e\u51fa\u756a\u304c\u3042\u308b\u306e\u3067\u3059\u3002<\/p>\n<h4>\uff14-\uff13-\uff11\uff0eComparator\u306e\u30e9\u30e0\u30c0\u5f0f\u3067\u306e\u30ab\u30b9\u30bf\u30de\u30a4\u30ba<\/h4>\n<p>\u3053\u3053\u3067\u306f\u3001\u6587\u5b57\u5217\u306e\u30bd\u30fc\u30c8\u9806\u306e\u30eb\u30fc\u30eb\u304c\u300c\u6587\u5b57\u5217\u304c\u9577\u3044\u9806\u3001\u6587\u5b57\u5217\u306e\u9577\u3055\u304c\u540c\u3058\u306a\u3089\u8f9e\u66f8\u9806\u300d\u306e<span>java.util.Comparator<\/span>\u3092\u3001\u30e9\u30e0\u30c0\u5f0f\u3067\u4f5c\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u3054\u304f\u7d20\u76f4\u306b\u4f5c\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u3082\u3061\u308d\u3093\u3061\u3083\u3093\u3068\u52d5\u304f\u3082\u306e\u3067\u3059\u304c\u3001\u3053\u306e<span>Comparator<\/span>\u306f\u3053\u306e\u4ed5\u69d8\u3067\u306e\u30bd\u30fc\u30c8\u9806\u5c02\u7528\u3067\u3001\u4ed6\u3078\u306e\u4f7f\u3044\u307e\u308f\u3057\u304c\u3067\u304d\u306a\u3044\u300c\u4e00\u54c1\u7269\u300d\u306a\u306e\u306f\u5206\u304b\u308a\u307e\u3059\u304b<span>?<\/span><\/p>\n<pre class=\"prettyprint lang:default decode:true\">Comparator&lt;String&gt; c = (s1, s2) -&gt; {\r\n    int diff = s2.length() - s1.length();\r\n    return diff != 0 ? diff : s1.compareTo(s2);\r\n};\r\n\r\nList&lt;String&gt; list = Arrays.asList(\"BB\", \"ABCDE\", \"AA\");\r\nCollections.sort(list, c);\r\n\r\nSystem.out.println(list); \/\/ \u2192 [ABCDE, AA, BB]<\/pre>\n<p>\u3053\u308c\u3092\u3001<span>Comparator<\/span>\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b\u3084\u308a\u65b9\u306b\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u6700\u521d\u306b\u6587\u5b57\u5217\u9577\u3067\u6bd4\u8f03\u3059\u308b<span>Comparator<\/span>\u3092\u4f5c\u308a\u3001\u6b21\u306b\u8f9e\u66f8\u9806\u3067\u6bd4\u8f03\u3059\u308b<span>Comparator<\/span>\u3092\u300c\u8ffd\u52a0\u300d\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Comparator&lt;String&gt; c1 = (s1, s2) -&gt; s2.length() - s1.length();\r\nComparator&lt;String&gt; c2 = c1.thenComparing((s1, s2) -&gt; s1.compareTo(s2));\r\n\r\nList&lt;String&gt; list = Arrays.asList(\"BB\", \"ABCDE\", \"AA\");\r\nCollections.sort(list, c2);\r\n\r\nSystem.out.println(list); \/\/ \u2192 [ABCDE, AA, BB]<\/pre>\n<p>\u3064\u307e\u308a\u3001<span>2<\/span>\u3064\u306e\u52d5\u4f5c\u3092\u3059\u308b<span>Comparator<\/span>\u3092\u3064\u306a\u304e\u5408\u308f\u305b\u308b\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3092\u884c\u3044\u307e\u3057\u305f\u3002\u30e9\u30e0\u30c0\u5f0f\u3067\u8ffd\u52a0\u3057\u305f\u306e\u306f\u300c\u8f9e\u66f8\u9806\u3067\u306e\u6bd4\u8f03\u300d\u3060\u3051\u3002\u6587\u5b57\u5217\u9577\u3067\u306e\u6bd4\u8f03\u306f\u3001\u65e2\u306b\u4f5c\u3063\u305f\u3082\u306e\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3057\u305f\u3044\u3053\u3068\u3092\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u8868\u73fe\u3067\u304d\u308b\u30e1\u30bd\u30c3\u30c9\u304c\u3001<span>Java 8<\/span>\u4ee5\u964d\u3067\u306f\u3082\u306e\u3059\u3054\u304f\u5897\u3048\u307e\u3057\u305f\u3002\u30e9\u30e0\u30c0\u5f0f\u306e\u3053\u306e\u3088\u3046\u306a\u4f7f\u3044\u65b9\u3092\u77e5\u3063\u3066\u304a\u304f\u3068\u5927\u5909\u4fbf\u5229\u3067\u3059\u3088\u3002<\/p>\n<h3><span id=\"i-13\">\uff14-\uff14\uff0e\u305d\u306e\u4ed6\u306e\u4f7f\u308f\u308c\u65b9<\/span><\/h3>\n<p>\u305d\u306e\u4ed6\u306e\u30e9\u30e0\u30c0\u5f0f\u306e\u4f7f\u308f\u308c\u65b9\u3082\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u52d5\u4f5c\u304b\u3089\u3069\u3046\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b\u304b\u2026\u306e\u300c\u3069\u3046\u3059\u308b\u300d\u3092\u8868\u73fe\u3059\u308b\u306e\u306b\u4f7f\u3046\u5834\u5408\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u306e\u4e2d\u306e\u3068\u3042\u308b\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u3042\u308b\u30d5\u30a1\u30a4\u30eb\u30fb\u30b5\u30d6\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306e\u4e2d\u304b\u3089\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u30d5\u30a1\u30a4\u30eb\u3092\u4e00\u89a7\u5316\u3057\u305f\u3044\u3068\u3057\u307e\u3059\u3002<\/p>\n<p>\u30d5\u30a1\u30a4\u30eb\u3092\u63a2\u3057\u51fa\u3059\u6a5f\u80fd\u306e\u30af\u30e9\u30b9\u30fb\u30e1\u30bd\u30c3\u30c9\u306f\u3001<span>Java<\/span>\u306e\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u3082\u3046\u3042\u308a\u307e\u3059\u3002\u3067\u3082\u300c\u3069\u3093\u306a\u30d5\u30a1\u30a4\u30eb\u304c\u6b32\u3057\u3044\u300d\u3068\u3044\u3046\u62bd\u51fa\u6761\u4ef6\u306f\u3001\u4f7f\u3046\u5074\u304c\u6307\u5b9a\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u305d\u306e\u62bd\u51fa\u6761\u4ef6\u3092\u30e9\u30e0\u30c0\u5f0f\u3067\u8868\u73fe\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u305d\u306e\u305f\u3081\u306b\u4f7f\u3046\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306f\u3001<span>java.util.functions.BiPredicate<\/span>\u3067\u3059\u3002\u62bd\u51fa\u6761\u4ef6\u306f\u540d\u524d\u304c<span>&#8220;.java&#8221;<\/span>\u3067\u7d42\u308f\u308b\u3082\u306e\u3068\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Path root = Paths.get(\"\/a\/b\/c\");\r\nFiles.find(root, 10, (entry, attr) -&gt; entry.toString().endsWith(\".java\"))\r\n    .forEach(file -&gt; System.out.println(file.toString()));<\/pre>\n<p>\u30d1\u30b9<span>\/a\/b\/c<\/span>\u306e\u914d\u4e0b\u306b\u3042\u308b\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u968e\u5c64\u3092<span>10<\/span>\u968e\u5c64\u307e\u3067\u305f\u3069\u308a\u3001\u305d\u306e\u4e2d\u3067\u540d\u524d\u304c<span>&#8220;.java&#8221;<\/span>\u3067\u7d42\u308f\u308b\u3082\u306e\u3092\u62bd\u51fa\u3057\u3066\u3001\u305d\u308c\u3089\u306e\u540d\u524d\u3092<span>print<\/span>\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001\u62bd\u51fa\u6761\u4ef6\u3092\u5909\u3048\u305f\u3051\u308c\u3070\u3001<span>BiPredicate<\/span>\u3092\u30e9\u30e0\u30c0\u5f0f\u3067\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u65b0\u3057\u304f\u4f5c\u3063\u3066\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u63a2\u3059\u30e1\u30bd\u30c3\u30c9\u306b\u300c\u3053\u308c\u3067\u63a2\u3057\u3066\u306d\u300d\u3068\u6e21\u3057\u3066\u3042\u3052\u308c\u3070\u3044\u3044\u3060\u3051\u306a\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">BiPredicate&lt;Path, BasicFileAttributes&gt; java = (entry, attr) -&gt; entry.toString().endsWith(\".java\");\r\nBiPredicate&lt;Path, BasicFileAttributes&gt; clazz = (entry, attr) -&gt; entry.toString().endsWith(\".class\");\r\n\r\nPath root = Paths.get(\"\/a\/b\/c\");\r\nFiles.find(root, 10, java).forEach(file -&gt; System.out.println(file.toString()));\r\nFiles.find(root, 10, clazz).forEach(file -&gt; System.out.println(file.toString()));<\/pre>\n<p>\u3053\u3093\u306a\u611f\u3058\u3067\u3001<span>Java 8<\/span>\u4ee5\u964d\u306e<span>Java<\/span>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u306f\u3001\u30e9\u30e0\u30c0\u5f0f\u304c\u4f7f\u3048\u308b\u5834\u6240\u304c\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u3002\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u304c\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306a\u3089\u300c\u30e9\u30e0\u30c0\u5f0f\u304c\u4f7f\u3048\u308b\u305e<span>!!<\/span>\u300d\u3068\u559c\u3073\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2><span id=\"i-14\">\uff15\uff0e\u3010\u767a\u5c55\u3011\u30e9\u30e0\u30c0\u5f0f\u30fb\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3068\u90e8\u54c1\u5316\u306e\u8003\u3048\u65b9<\/span><\/h2>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u4f7f\u3063\u305f\u300c\u51e6\u7406\u306e\u90e8\u54c1\u5316\u300d\u306b\u3064\u3044\u3066\u8003\u3048\u3066\u3044\u304d\u307e\u3059\u3002\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3068\u30e9\u30e0\u30c0\u5f0f\u306e\u5c0e\u5165\u76ee\u7684\u306b\u3082\u5927\u304d\u304f\u95a2\u4fc2\u3057\u3066\u3044\u308b\u3001\u5927\u4e8b\u306a\u3053\u3068\u3067\u3059\u3002<\/p>\n<h3><span id=\"i-15\">\uff15-\uff11\uff0e\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308b\u90e8\u54c1\u5316<\/span><\/h3>\n<p>Java\u3067\u51e6\u7406\u3092\u5171\u901a\u5316\u3059\u308b\u6642\u306b\u3001<span>Java<\/span>\u30d7\u30ed\u30b0\u30e9\u30de\u304c\u4e00\u756a\u6700\u521d\u306b\u8003\u3048\u308b\u306e\u306f\u30e1\u30bd\u30c3\u30c9\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u540c\u3058\u6587\u5b57\u5217\u3092\u4e8c\u3064\u3064\u306a\u3052\u308b\u51e6\u7406\u304c\u5fc5\u8981\u306b\u306a\u3063\u305f\u306a\u3089\u3001\u304d\u3063\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u3063\u3066\u547c\u3073\u51fa\u3057\u307e\u3059\u3088\u306d\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String duplicate(String s) {\r\n    return s + s;\r\n}<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">String s1 = duplicate(\"ABC\");\r\nSystem.out.println(s1); \/\/ \u2192 \"ABCABC\"\r\n\r\nString s2 = duplicate(\"\u3042\u3044\u3046\u3048\u304a\");\r\nSystem.out.println(s2); \/\/ \u2192 \"\u3042\u3044\u3046\u3048\u304a\u3042\u3044\u3046\u3048\u304a\"<\/pre>\n<p>\u3053\u3053\u3067\u4f55\u304b\u306e\u7406\u7531\u3067\u30e1\u30bd\u30c3\u30c9\u306e\u540d\u524d\u3092\u5909\u3048\u305f\u3044\u306a\u3089\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u4e2d\u3067\u305d\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u308b\u3068\u3053\u308d\u3092\u3059\u3079\u3066\u76f4\u3057\u307e\u3059\u3002\u305d\u3046\u3057\u306a\u3044\u3068\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u304b\u3089\u306d\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001<span>Java<\/span>\u306e\u30e1\u30bd\u30c3\u30c9\u306b\u306f\u3068\u3066\u3082\u5f37\u3044\u5236\u7d04\u30fb\u5236\u9650\u304c\u3042\u308b\u306e\u3067\u3059\u3002<span>Java<\/span>\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u3044\u308f\u3086\u308b\u30d5\u30a1\u30fc\u30b9\u30c8\u30af\u30e9\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<span>(<\/span>\u7b2c\u4e00\u7d1a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<span>)<\/span>\u3067\u306f\u306a\u3044\u304b\u3089\u3067\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3><span id=\"i-16\">\uff15-\uff12\uff0e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306b\u3088\u308b\u90e8\u54c1\u5316<\/span><\/h3>\n<p>\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3068\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u3063\u3066\u3001\u540c\u3058\u3053\u3068\u3092\u3059\u308b\u90e8\u54c1\u3092\u4f5c\u3063\u3066\u307f\u307e\u3059\u3002\u4f7f\u3046\u306e\u306f\u3001\u5f15\u6570\u3092\u4e00\u3064\u53d6\u308a\u3001\u4f55\u304b\u306e\u623b\u308a\u5024\u3092\u623b\u3059<span>java.util.function.Function<\/span>\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Function&lt;String, String&gt; duplicate = s -&gt; s + s;\r\n\r\nString s1 = duplicate.apply(\"ABC\");\r\nSystem.out.println(s1); \/\/ \u2192 \"ABCABC\"\r\n\r\nString s2 = duplicate.apply(\"\u3042\u3044\u3046\u3048\u304a\");\r\nSystem.out.println(s2); \/\/ \u2192 \"\u3042\u3044\u3046\u3048\u304a\u3042\u3044\u3046\u3048\u304a\"<\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u6587\u5b57\u5217\u3092\u3064\u306a\u3052\u308b<span>Function<\/span>\u304c\u3067\u304d\u307e\u3057\u305f\u3002\u78ba\u304b\u306b\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u3058\u52d5\u304d\u3092\u3057\u307e\u3059\u304c\u3001\u30e1\u30bd\u30c3\u30c9\u3068\u5927\u3057\u3066\u5909\u308f\u3089\u306a\u3044\u5370\u8c61\u3067\u3059\u3002\u3067\u3082\u3001\u5b9f\u306f\u4fbf\u5229\u306a\u3082\u306e\u3060\u3068\u3044\u3046\u3053\u3068\u3092\u3001\u6b21\u306b\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3><span id=\"i-17\">\uff15-\uff13\uff0e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306a\u3089\u51e6\u7406\u3092\u5dee\u3057\u66ff\u3048\u3067\u304d\u308b<\/span><\/h3>\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3001\u5f15\u6570\u306e<span>String<\/span>\u306b\u5bfe\u3057\u3066\u3001<span>Function&lt;String, String&gt;<\/span>\u3067\u51e6\u7406\u3092\u884c\u3063\u305f\u7d50\u679c\u3092\u623b\u3059\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String applyFunctions(String s, Function&lt;String, String&gt;... functions) {\r\n    String ret = s;\r\n\r\n    for (Function&lt;String, String&gt; function : functions) {\r\n        ret = function.apply(ret);\r\n    }\r\n\r\n    return ret;\r\n}<\/pre>\n<p>\u3053\u306e<span>applyFunctions<\/span>\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u3048\u307e\u3059\u3002<span>applyFunctions<\/span>\u306b\u3069\u3093\u306a\u300c\u51e6\u7406\u300d\u3092\u5f15\u6570\u3067\u4e0e\u3048\u308b\u304b\u3067\u3001\u7d50\u679c\u304c\u5909\u308f\u308a\u307e\u3059\u3002\u3053\u3053\u3067<span>applyFunctions<\/span>\u81ea\u4f53\u306f\u4f55\u3082\u5909\u3048\u3066\u306f\u3044\u306a\u3044\u3053\u3068\u306b\u6ce8\u76ee\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Function&lt;String, String&gt; firstChar = s -&gt; s.substring(0, 1);\r\nFunction&lt;String, String&gt; duplicate = s -&gt; s + s;\r\n\r\nString s1 = applyFunctions(\"ABC\", firstChar);\r\nSystem.out.println(s1); \/\/ \u2192 \"A\"\r\n\r\nString s2 = applyFunctions(\"ABC\", duplicate);\r\nSystem.out.println(s2); \/\/ \u2192 \"ABCABC\"\r\n\r\nString s3 = applyFunctions(\"ABC\", firstChar, duplicate);\r\nSystem.out.println(s3); \/\/ \u2192 \"AA\"<\/pre>\n<p>applyFunctions\u3078\u3069\u3093\u306a<span>Function<\/span>\u3092\u4e0e\u3048\u308b\u304b\u3067\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u52d5\u304d\u3092\u547c\u3073\u51fa\u3059\u5074\u304c\u81ea\u7531\u306b\u5909\u3048\u3089\u308c\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u30e1\u30bd\u30c3\u30c9\u3084\u30af\u30e9\u30b9\u306e\u5916\u90e8\u304b\u3089\u300c\u4f55\u3092\u3059\u308b\u304b<span>(=Function)<\/span>\u300d\u3092\u5dee\u3057\u66ff\u3048\u3089\u308c\u308b\u306e\u3067\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001<span>Function<\/span>\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3054\u3068\u306b\u3084\u308b\u3053\u3068\u304c\u9055\u3044\u307e\u3059\u3002\u3067\u3082\u3001<span>Function<\/span>\u3068\u3044\u3046\u578b\u3068\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u65b9\u306f\u3059\u3079\u3066\u540c\u3058\u3002\u540c\u3058\u578b\u3067\u3055\u3048\u3042\u308c\u3070\u3001<span>applyFunctions<\/span>\u3067\u540c\u3058\u3088\u3046\u306b\u4f7f\u3048\u308b\u306e\u3067\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u300c\u62bd\u8c61\u5ea6\u300d\u304c\u4e0a\u304c\u3063\u305f\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u304b<span>? applyFunctions<\/span>\u306e\u5f79\u5272\u306f\u90e8\u54c1\u306e<span>Function<\/span>\u3092\u6c7a\u3081\u3089\u308c\u305f\u624b\u9806\u3067\u5b9f\u884c\u3059\u308b\u3060\u3051\u3001\u90e8\u54c1\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u5916\u304b\u3089\u4e0e\u3048\u3089\u308c\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<h3><span id=\"-Java-2\">\uff15-\uff14\uff0eJava\u3067\u306e\u95a2\u6570\u306f\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9<\/span><\/h3>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306e\u6587\u8108\u3067\u306f\u300c\u95a2\u6570<span>(function)<\/span>\u300d\u3068\u3044\u3046\u8a00\u8449\u304c\u983b\u7e41\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002\u300c\u95a2\u6570\u300d\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u3042\u3063\u305f\u308a\u3001<span>Stream API<\/span>\u306f\u96c6\u5408\u306b\u300c\u95a2\u6570\u300d\u3092\u9069\u7528\u3057\u305f\u7d50\u679c\u3092\u5f97\u308b\u2026\u3068\u3082\u8868\u73fe\u3055\u308c\u307e\u3059\u306d\u3002<\/p>\n<p>\u3053\u306e\u6587\u8108\u3067\u306e\u95a2\u6570\u306f\u3001\u6570\u5b66\u3067\u306e\u300c\u4f55\u304b\u3092\u4f55\u304b\u306b\u5bfe\u5fdc\u3065\u3051\u308b\u3082\u306e<span>(<\/span>\u5c04\u5f71<span>)<\/span>\u300d\u306e\u610f\u5473\u3067\u4f7f\u308f\u308c\u307e\u3059\u3002\u8a00\u3044\u63db\u3048\u308c\u3070\u3001\u4f55\u304b\u3092\u5165\u529b\u306b\u3057\u3066\u4f55\u304b\u3092\u623b\u3059\u30e2\u30ce\u3067\u3042\u308a\u3001\u3053\u308c\u3053\u305d\u304c\u6570\u5b66\u306e\u9ad8\u3044\u62bd\u8c61\u5ea6\u306e\u6e90\u6cc9\u3067\u3059\u3002<\/p>\n<p>\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3068\u3001\u305d\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u7c21\u5358\u306b\u4f5c\u308b\u305f\u3081\u306e\u30e9\u30e0\u30c0\u5f0f\u306f\u3001\u524d\u8ff0\u306e\u610f\u5473\u3067\u306e\u300c\u95a2\u6570\u300d\u3092\u6d3b\u7528\u3057\u305f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30bf\u30a4\u30eb\u3092\u3001<span>Java<\/span>\u3078\u7a4d\u6975\u7684\u306b\u5c0e\u5165\u3057\u3088\u3046\u3068\u3044\u3046\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001\u4f55\u304b<span>1<\/span>\u3064\u306e\u3053\u3068\u304c\u3067\u304d\u308b\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u3001\u51e6\u7406\u304c\u5177\u73fe\u5316\u3057\u305f\u90e8\u54c1\u3068\u3057\u3066\u6271\u304a\u3046\u3001\u3068\u3044\u3046\u8003\u3048\u65b9\u3067\u3059\u3002\u305d\u306e\u90e8\u54c1\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3001\u8907\u96d1\u306a\u51e6\u7406\u3092\u4f5c\u308b\u306e\u3067\u3059\u3002<\/p>\n<h3><span id=\"i-18\">\uff15-\uff15\uff0e\u30e9\u30e0\u30c0\u5f0f\u304c\u95a2\u6570\u3092\u4f5c\u308b\u30cf\u30fc\u30c9\u30eb\u3092\u4e0b\u3052\u308b<\/span><\/h3>\n<p>\u3053\u3053\u307e\u3067\u304a\u4f1d\u3048\u3057\u3066\u304d\u305f\u3053\u3068\u306f\u3001<span>Java<\/span>\u306b\u3068\u3063\u3066\u672c\u5f53\u306e\u610f\u5473\u3067\u65b0\u3057\u3044\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30bf\u30a4\u30eb\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30e9\u30e0\u30c0\u5f0f\u3067\u306a\u304f\u3066\u3082\u3001\u4eca\u307e\u3067\u3082\u4f7f\u3048\u305f\u9053\u5177\u2026\u3064\u307e\u308a\u30af\u30e9\u30b9\u3084\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306a\u3069\u3067\u3082\u300c\u3067\u304d\u308b\u300d\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u4eca\u307e\u3067\u306f\u300c\u95a2\u6570\u300d\u7684\u306a\u8003\u3048\u65b9\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u308b\u3053\u3068\u3078\u306f\u3001<span>Java<\/span>\u30d7\u30ed\u30b0\u30e9\u30de\u306e\u5fc3\u7406\u7684\u30cf\u30fc\u30c9\u30eb\u3084\u30b9\u30ad\u30eb\u5dee\u304c\u7acb\u3061\u306f\u3060\u304b\u3063\u3066\u3044\u307e\u3057\u305f\u3002\u95a2\u6570\u7684\u306a\u8003\u3048\u65b9\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u308c\u308b\u300c\u53ef\u80fd\u6027\u300d\u3068\u3001\u305d\u306e\u4f5c\u308a\u65b9\u304c\u30d7\u30ed\u30b0\u30e9\u30de\u305f\u3061\u3078\u6d78\u900f\u3057\u3066\u3044\u308b\u3053\u3068\u3068\u306f\u5225\u306a\u306e\u3067\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u591a\u304f\u306e\u884c\u3092\u8cbb\u3084\u3057\u3066\u30af\u30e9\u30b9\u3092\u5b9a\u7fa9\u3057\u305f\u308a\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u306e\u306f\u9762\u5012\u306a\u3053\u3068\u3067\u3057\u305f\u3002\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u884c\u6570\u304c\u5897\u3048\u308b\u3068\u3001\u305d\u308c\u3060\u3051\u3067\u8aad\u307f\u3065\u3089\u304f\u3082\u306a\u308a\u307e\u3059\u3057\u306d\u3002\u305d\u308c\u306b\u3001\u533f\u540d\u30af\u30e9\u30b9\u306e\u4f7f\u3044\u65b9\u3084\u8003\u3048\u65b9\u3092\u77e5\u3089\u306a\u3044<span>Java<\/span>\u30d7\u30ed\u30b0\u30e9\u30de\u306f\u3001\u610f\u5916\u306b\u591a\u3044\u306e\u3067\u3059\u3002<\/p>\n<p>\u3067\u3082\u3001\u30e9\u30e0\u30c0\u5f0f\u306a\u3089\u3084\u308a\u305f\u3044\u51e6\u7406\u3060\u3051\u3092\u624b\u8efd\u306b\u77ed\u304f\u66f8\u3051\u308b\u306e\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30de\u304c\u4f7f\u304a\u3046\u3068\u3044\u3046\u6c17\u306b\u306a\u308a\u307e\u3059\u3002\u30e9\u30e0\u30c0\u5f0f\u3053\u305d\u304c\u3001<span>Java<\/span>\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30bf\u30a4\u30eb\u3092\u5927\u304d\u304f\u5909\u3048\u3066\u3044\u304f\u8d77\u7206\u5264\u306a\u306e\u3067\u3059\u3002<\/p>\n<h2><span id=\"i-19\">\uff16\uff0e\u307e\u3068\u3081<\/span><\/h2>\n<p>Java\u306e\u30e9\u30e0\u30c0\u5f0f\u306f\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u7c21\u5358\u306b\u4f5c\u308b\u305f\u3081\u306e\u6587\u6cd5\u3067\u3059\u3002\u3053\u308c\u3055\u3048\u5fd8\u308c\u306a\u3051\u308c\u3070\u3001\u30e9\u30e0\u30c0\u5f0f\u306b\u60d1\u308f\u3055\u308c\u308b\u3053\u3068\u306f\u5c11\u306a\u304f\u306a\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u304c<span>1<\/span>\u3064\u3060\u3051\u3042\u308b\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3001\u3053\u308c\u3053\u305d\u304c\u30e9\u30e0\u30c0\u5f0f\u306e\u821e\u53f0\u88cf\u3092\u652f\u3048\u308b\u5927\u7acb\u5f79\u8005\u3067\u3059\u3002\u3053\u308c\u3082\u7d76\u5bfe\u78ba\u5b9f\u306b\u305d\u306e\u4ed5\u7d44\u307f\u30fb\u610f\u5473\u30fb\u610f\u7fa9\u3092\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>Java\u306f\u30e9\u30e0\u30c0\u5f0f\u3092\u898b\u3064\u3051\u308b\u3068\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u3069\u3053\u304b\u304b\u3089\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u578b\u3092\u898b\u3064\u3051\u3001<span>1<\/span>\u3064\u3060\u3051\u3042\u308b\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u3092\u81ea\u52d5\u3067\u4f5c\u308a\u3001\u305d\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/p>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306e\u6d3b\u7528\u65b9\u6cd5\u306f\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u304a\u624b\u8efd\u306b\u4f5c\u6210\u3057\u3066\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u4e2d\u3067\u90e8\u54c1\u3001\u3059\u306a\u308f\u3061\u95a2\u6570\u3068\u3057\u3066\u6271\u3046\u3053\u3068\u3067\u3059\u3002\u95a2\u6570\u3092\u5168\u9762\u7684\u306b\u6d3b\u7528\u3059\u308b\u4f8b\u304c<span>Stream API<\/span>\u3067\u3042\u308a\u3001\u305d\u306e\u5b9f\u7528\u9762\u3092\u652f\u3048\u308b\u306e\u304c\u30e9\u30e0\u30c0\u5f0f\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30e9\u30e0\u30c0\u5f0f\u3068\u540c\u6642\u306b\u8ffd\u52a0\u3055\u308c\u3001\u4e00\u5fc3\u540c\u4f53\u3067\u3082\u3042\u308b\u30e1\u30bd\u30c3\u30c9\u53c2\u7167<span>(method reference)<\/span>\u306b\u306f\u89e6\u308c\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u5225\u306e\u8a18\u4e8b\u3067\u304a\u4f1d\u3048\u3059\u308b\u3053\u3068\u3082\u3042\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u30e9\u30e0\u30c0\u5f0f\u304c\u5206\u304b\u308c\u3070\u30e1\u30bd\u30c3\u30c9\u53c2\u7167\u306e\u7406\u89e3\u307e\u3067\u306f\u3082\u3046\u3059\u3050\u3067\u3059\u3088\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306e\u30e9\u30e0\u30c0\u5f0f(lambda expression)\u3068\u306f\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u3001\u3054\u304f\u77ed\u3044\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u91cf\u3067\u3068\u3066\u3082\u7c21\u5358\u306b\u4f5c\u308c\u3066\u3057\u307e\u3046\u6587\u6cd5\u306e\u3053\u3068\u3067\u3059\u3002 \u30e9\u30e0\u30c0\u5f0f\u306f\u3001Java 8\u304b\u3089\u8ffd\u52a0\u3055\u308c [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":804,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"acf":[],"_links":{"self":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/2319"}],"collection":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/comments?post=2319"}],"version-history":[{"count":7,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/2319\/revisions"}],"predecessor-version":[{"id":2322,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/2319\/revisions\/2322"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/media\/804"}],"wp:attachment":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/media?parent=2319"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/categories?post=2319"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}