{"id":858,"date":"2018-11-01T12:00:14","date_gmt":"2018-11-01T03:00:14","guid":{"rendered":"https:\/\/www.bold.ne.jp\/engineer-club\/?p=858"},"modified":"2025-09-17T10:48:26","modified_gmt":"2025-09-17T01:48:26","slug":"java-foreach","status":"publish","type":"post","link":"https:\/\/www.bold.ne.jp\/engineer-club\/java-foreach","title":{"rendered":"Java foreach\u3068\u306f\uff1fJava\u306eforeach\u95a2\u9023\u69cb\u6587\u30fb\u6a5f\u80fd\u3092\u7d39\u4ecb"},"content":{"rendered":"<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u4e0a\u3067\u30e2\u30ce\u306e\u96c6\u307e\u308a<span>(<\/span>\u914d\u5217\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u7b49<span>)<\/span>\u306e\u5404\u8981\u7d20\u3078\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u884c\u3046\u69cb\u6587\u3084\u6a5f\u80fd\u3092\u3001\u4e00\u822c\u306b<span>foreach<\/span>\u6587\u3068\u8a00\u3044\u307e\u3059\u3002<br \/>\n<span>Java<\/span>\u3067<span>foreach<\/span>\u6587\u306b\u76f4\u63a5\u5bfe\u5fdc\u3059\u308b\u3082\u306e\u306f\u62e1\u5f35<span>for<\/span>\u6587\u3067\u3059\u3002<\/p>\n<p>\u305f\u3060\u3001<span>foreach<\/span>\u6587\u3092\u300c\u4f55\u304b\u3078\u306e\u7e70\u308a\u8fd4\u3057\u300d\u3068\u3044\u3046\u5c11\u3057\u9ad8\u3044\u8996\u70b9\u3067\u898b\u308c\u3070\u3001<span>Java<\/span>\u306b\u306f\u62e1\u5f35<span>for<\/span>\u6587\u4ee5\u5916\u306b\u3082\u69d8\u3005\u306a\u624b\u6bb5\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u5927\u304d\u306a\u5206\u985e\u3067\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3068\u3057\u3066\u306e\u69cb\u6587\u3068\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u63d0\u4f9b\u3055\u308c\u308b\u6a5f\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<span>Java<\/span>\u306b\u304a\u3051\u308b\u5e83\u3044\u610f\u5473\u3067\u306e<span>foreach<\/span>\u6587\u3068\u3001\u5b9f\u52d9\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u826f\u304f\u4f7f\u3046\u6a5f\u80fd\u3092\u3001<span>Java<\/span>\u306e\u521d\u5fc3\u8005\u5411\u3051\u306b\u6982\u89b3\u3057\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u306e\u69cb\u6587\u306e\u7279\u5fb4\u3092\u5b66\u3093\u3067\u3001\u9069\u6750\u9069\u6240\u3067\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u3087\u3046<span>!!<\/span><\/p>\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">\u76ee\u6b21<\/p><ul class=\"toc_list\"><li><a href=\"#Javaforeach\">\uff11\uff0eJava\u306e\u7d44\u307f\u8fbc\u307f\u69cb\u6587\u306b\u3088\u308bforeach<\/a><ul><li><a href=\"#-for\">\uff11-\uff11\uff0e\u62e1\u5f35for\u6587<\/a><\/li><li><a href=\"#-forwhile\">\uff11-\uff12\uff0efor\u6587\/while\u6587<\/a><\/li><li><a href=\"#-Javaforwhile\">\uff11-\uff13\uff0e\u3010Java\u3011for\u6587\/while\u6587\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u7ba1\u7406<\/a><\/li><\/ul><\/li><li><a href=\"#foreachJava_7\">\uff12\uff0e\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u3088\u308bforeach(Java 7\u307e\u3067)<\/a><ul><li><a href=\"#-Iterator\">\uff12-\uff11\uff0eIterator<\/a><\/li><li><a href=\"#-Iterator-2\">\uff12-\uff12\uff0eIterator\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u304f\u90e8\u5206\u304c\u307e\u3060\u591a\u3044\u3053\u3068<\/a><\/li><li><a href=\"#-Enumeration\">\uff12-\uff13\uff0e\u3010\u53c2\u8003\u3011Enumeration<\/a><\/li><\/ul><\/li><li><a href=\"#JavaforeachJava_8\">\uff13\uff0e\u3010Java\u3011\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u3088\u308bforeach(Java 8\u4ee5\u964d)<\/a><ul><li><a href=\"#-StreamforEachConsumer\">\uff13-\uff11\uff0eStream.forEach(Consumer)<\/a><\/li><li><a href=\"#-IterableforEachConsumer\">\uff13-\uff12\uff0eIterable.forEach(Consumer)<\/a><\/li><li><a href=\"#i\">\uff13-\uff13\uff0e\u30eb\u30fc\u30d7\u69cb\u6587\u304b\u3089\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u6d3b\u7528\u3078<\/a><\/li><li><a href=\"#-IteratorforEachRemainingConsumer\">\uff13-\uff14\uff0e\u3010\u53c2\u8003\u3011Iterator.forEachRemaining(Consumer)<\/a><\/li><\/ul><\/li><li><a href=\"#Javaforeach-2\">\uff14\uff0e\u3010Java\u3011\u518d\u5e30\u547c\u3073\u51fa\u3057\u306b\u3088\u308bforeach<\/a><\/li><li><a href=\"#i-2\">\uff15\uff0e\u307e\u3068\u3081<\/a><\/li><\/ul><\/div>\n<h2><span id=\"Javaforeach\">\uff11\uff0eJava\u306e\u7d44\u307f\u8fbc\u307f\u69cb\u6587\u306b\u3088\u308b<span>foreach<\/span><\/span><\/h2>\n<p>Java\u3067\u306e\u30eb\u30fc\u30d7\u306e\u57fa\u672c\u306f<span>for<\/span>\u6587\u3068<span>while<\/span>\u6587\u3067\u3059\u3002\u3055\u3089\u306b\u3001<span>Java<\/span>\u306e<span>for<\/span>\u6587\u306b\u306f\u62e1\u5f35<span>for<\/span>\u6587\u3068\u3044\u3046\u3082\u306e\u304c\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n<p>\u4e00\u822c\u7684\u306b<span>Java<\/span>\u3067\u306e<span>foreach<\/span>\u6587\u3068\u8a00\u3046\u3068\u3001\u3053\u306e\u62e1\u5f35<span>for<\/span>\u6587\u3092\u6307\u3059\u306e\u304c\u666e\u901a\u3068\u601d\u308f\u308c\u307e\u3059\u306e\u3067\u3001\u62e1\u5f35<span>for<\/span>\u6587\u30fb<span>for<\/span>\u6587<span>\/while<\/span>\u6587\u306e\u9806\u756a\u3067<span>foreach<\/span>\u3059\u308b\u6642\u306e\u30b5\u30f3\u30d7\u30eb\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h3><span id=\"-for\">\uff11-\uff11\uff0e\u62e1\u5f35<span>for<\/span>\u6587<\/span><\/h3>\n<h4>\uff11-\uff11-\uff11\uff0e\u62e1\u5f35<span>for<\/span>\u6587\u306e\u57fa\u672c<\/h4>\n<p>Java 1.5\u3067\u8ffd\u52a0\u3055\u308c\u305f\u62e1\u5f35<span>for<\/span>\u6587\u306b\u3088\u308b<span>foreach<\/span>\u3092\u7528\u3044\u308b\u3068\u3001\u914d\u5217\u3084\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u5168\u8981\u7d20\u3078\u5148\u982d\u304b\u3089\u7c21\u5358\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059\u3002\u3057\u304b\u3082\u3001\u901a\u5e38\u306e<span>for<\/span>\u6587\u3067\u5fc5\u8981\u306a\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3084\u914d\u5217\u30fb\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306a\u3069\u304b\u3089\u306e\u8981\u7d20\u306e\u53d6\u308a\u51fa\u3057\u51e6\u7406\u3092\u81ea\u5206\u3067\u66f8\u304b\u306a\u304f\u3066\u3082\u3044\u3044\u306e\u3067\u3059\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001\u62e1\u5f35<span>for<\/span>\u6587\u306f\u3001\u901a\u5e38\u306e<span>for<\/span>\u6587\u3067\u884c\u3063\u3066\u3044\u308b\u3053\u3068\u3092\u7c21\u7565\u5316\u3057\u3066\u66f8\u3051\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u3060\u3051\u3067\u3059\u3002\u3064\u307e\u308a\u3001<span>for<\/span>\u6587\u3067\u3084\u308b\u3088\u3046\u306a\u51e6\u7406\u3092<span>Java<\/span>\u304c\u88cf\u3067\u52dd\u624b\u306b\u3084\u3063\u3066\u304f\u308c\u3066\u3044\u308b\u3060\u3051\u3067\u3059\u3002\u3053\u308c\u3092\u7cd6\u8863\u69cb\u6587<span>(sugar syntax)<\/span>\u3068\u8a00\u3063\u305f\u308a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \u62e1\u5f35for\u6587\u306e\u69cb\u6587\r\nfor (\u53d6\u308a\u51fa\u3059\u8981\u7d20\u306e\u5909\u6570\u5ba3\u8a00 : \u914d\u5217\u3042\u308b\u3044\u306fjava.lang.Iterable\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9) {\r\n\t\u7e70\u308a\u8fd4\u3057\u51e6\u7406;\r\n}<\/pre>\n<p>\u306a\u304a\u3001\u901a\u5e38\u306e<span>for<\/span>\u6587\u3067\u306f<span>()<\/span>\u306e\u4e2d\u3067\u306e\u533a\u5207\u308a\u304c<span>&#8220;;&#8221;(<\/span>\u30bb\u30df\u30b3\u30ed\u30f3<span>)<\/span>\u4e8c\u3064\u3067\u3059\u304c\u3001\u62e1\u5f35<span>for<\/span>\u6587\u3067\u306f<span>&#8220;:&#8221;(<\/span>\u30b3\u30ed\u30f3<span>)<\/span>\u4e00\u3064\u3060\u3051\u306a\u306e\u3067\u9593\u9055\u3048\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u62e1\u5f35<span>for<\/span>\u6587\u306e\u4f8b\u3068\u3057\u3066\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002\u914d\u5217\u3068<span>java.util.List<\/span>\u3092\u7528\u3044\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \u914d\u5217\u3067\u306e\u4f8b\r\nint[] array = {1, 2, 3};\r\n\r\nfor (int e : array) { \/\/ e\u306fElement(\u8981\u7d20)\u306eE\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u5168\u3066\u540c\u3058\u3067\u3059\u3002\r\n\tSystem.out.println(e); \/\/ 1, 2, 3\u3068\u9806\u756a\u306b\u51fa\u529b\u3055\u308c\u308b\r\n}<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ Iterable\u3067\u306e\u4f8b(\u3053\u3053\u3067\u306fList)\r\nList&lt;Integer&gt; list = Arrays.asList(1, 2, 3);\r\n\r\nfor (Integer e : list) {\r\n\tSystem.out.println(e); \/\/ 1, 2, 3\u3068\u9806\u756a\u306b\u51fa\u529b\u3055\u308c\u308b\r\n}<\/pre>\n<p>for\u6587\u3068\u6bd4\u8f03\u3057\u305f\u5834\u5408\u306e\u62e1\u5f35<span>for<\/span>\u6587\u306e\u5236\u9650\u306f\u3001\u5fc5\u305a\u914d\u5217\u30fb\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u5148\u982d\u304b\u3089\u306e\u51e6\u7406\u3068\u306a\u308b\u3053\u3068\u3067\u3059\u3002\u5f8c\u308d\u304b\u3089\u51e6\u7406\u3092\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u62e1\u5f35<span>for<\/span>\u6587\u3067\u306f\u76f4\u63a5\u5bfe\u5fdc\u3067\u304d\u307e\u305b\u3093\u306e\u3067\u3001\u3042\u3089\u304b\u3058\u3081\u9006\u9806\u306b\u30bd\u30fc\u30c8\u3057\u76f4\u3059\u306a\u3069\u306e\u51e6\u7f6e\u304c\u5fc5\u8981\u3067\u3059\u3002\u4e00\u3064\u98db\u3070\u3057\u306a\u3069\u306b\u3057\u305f\u3044\u5834\u5408\u3082\u3001\u3072\u3068\u5de5\u592b\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<h4>\uff11-\uff11-\uff12\uff0eIterable\u3068\u306f\u7e70\u308a\u8fd4\u3057\u3067\u304d\u308b\u30e2\u30ce<\/h4>\n<p>\u5148\u7a0b\u3001<span>java.lang.Iterable<\/span>\u3068\u3044\u3046\u3082\u306e\u304c\u51fa\u3066\u304d\u307e\u3057\u305f\u3002<span>Iterable<\/span>\u3068\u306f\u300c\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3067\u304d\u308b\u3082\u306e\u300d\u3092\u8868\u73fe\u3057\u3066\u3044\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u3059\u3002\u4ee3\u8868\u7684\u306a<span>Iterable<\/span>\u306f<span>List<\/span>\u3084<span>Set<\/span>\u306a\u3069\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u3059\u304c\u3001\u9006\u306b\u8a00\u3048\u3070\u62e1\u5f35<span>for<\/span>\u6587\u306e\u5bfe\u8c61\u3068\u3067\u304d\u308b\u306e\u306f\u3001<span>List<\/span>\u3084<span>Set<\/span>\u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3001\u3068\u3044\u3046\u308f\u3051\u3067\u306f\u306a\u3044\u306e\u3067\u3059\u306d\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001<span>Iterable<\/span>\u3092\u6b63\u3057\u304f\u5b9f\u88c5\u3057\u3066\u3044\u308b\u30af\u30e9\u30b9\u306a\u3089\u4f55\u3067\u3082\u3001\u62e1\u5f35<span>for<\/span>\u6587\u3067<span>foreach<\/span>\u3067\u304d\u308b\u306e\u3067\u3059\u3002\u3059\u306a\u308f\u3061\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3082\u66f8\u3051\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Iterable&lt;Integer&gt; list = Arrays.asList(1, 2, 3); \/\/ \u5909\u6570list\u306e\u578b\u3092List\u3067\u306f\u306a\u304f\u3066Iterable\u3068\u3057\u3066\u307f\u305f\r\n\r\nfor (Integer e : list) { \/\/ Iterable\u3067\u3042\u308c\u3070\u62e1\u5f35for\u6587\u306e\u5bfe\u8c61\u3068\u3067\u304d\u308b\r\n\tSystem.out.println(e);\r\n}<\/pre>\n<p>\u306a\u304a\u3001<span>Java<\/span>\u306e\u6a19\u6e96<span>API<\/span>\u3092\u898b\u3066\u307f\u308b\u3068\u3001\u975e\u5e38\u306b\u591a\u304f\u306e\u30af\u30e9\u30b9\u3084\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304c\u3053\u306e<span>Iterable<\/span>\u3092\u5b9f\u88c5\u30fb\u7d99\u627f\u3057\u3066\u3044\u307e\u3059\u3002\u610f\u5916\u306a\u3082\u306e\u304c<span>Iterable<\/span>\u3060\u3063\u305f\u308a\u3059\u308b\u306e\u3067<span>(java.sql.SQLException<\/span>\u306a\u3069<span>!!)<\/span>\u3001<span>API<\/span>\u3092\u826f\u304f\u898b\u3066\u307f\u308b\u3068\u9762\u767d\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<h4>\uff11-\uff11-\uff13\uff0e\u3010\u53c2\u8003\u3011\u62e1\u5f35<span>for<\/span>\u6587\u3067\u306e\u591a\u6b21\u5143\u914d\u5217\u3084\u30cd\u30b9\u30c8\u3057\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u6271\u3044\u65b9<\/h4>\n<p>\u3055\u3066\u3001\u62e1\u5f35<span>for<\/span>\u6587\u3067\u53d6\u308a\u51fa\u3059\u5909\u6570\u306e\u578b\u306f\u3001\u914d\u5217\u306a\u3089\u914d\u5217\u3067\u4fdd\u6301\u3057\u3066\u3044\u308b\u8981\u7d20\u306e\u578b\u3067\u3059\u3002<\/p>\n<p>\u3068\u3044\u3046\u3053\u3068\u306f\u3001\u591a\u6b21\u5143\u914d\u5217\u3092\u62e1\u5f35<span>for<\/span>\u6587\u3067\u6271\u3046\u5834\u5408\u306e\u5909\u6570\u304c\u3069\u3046\u306a\u308b\u304b\u3068\u3044\u3046\u3068\u3001\u4e8c\u6b21\u5143\u914d\u5217\u306a\u3089\u300c\u4e00\u6b21\u5143\u76ee\u306e\u914d\u5217\u306e\u8981\u7d20\u306f\u3001\u4e8c\u6b21\u5143\u76ee\u306e\u914d\u5217\u3078\u306e\u53c2\u7167\u3092\u4fdd\u6301\u3057\u3066\u3044\u308b\u300d\u306e\u3067\u3059\u304b\u3089\u3001\u4e8c\u6b21\u5143\u76ee\u306e\u914d\u5217\u81ea\u4f53\u304c\u53d6\u308a\u51fa\u3059\u5909\u6570\u3068\u306a\u308b\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \u4e8c\u6b21\u5143\u914d\u5217\u3067\u306e\u62e1\u5f35for\u6587\u306e\u4f8b\r\nint[][] array = {{1, 2, 3}, {4, 5, 6}};\r\n\r\nfor (int[] subarray : array) { \/\/ \u4e00\u6b21\u5143\u76ee\u306e\u914d\u5217\u304b\u3089\u4e8c\u6b21\u5143\u76ee\u306e\u914d\u5217\u3078\u306e\u53c2\u7167\u3092\u53d6\u308a\u51fa\u3057\u3066\u3001\r\n\tfor (int e : subarray) { \/\/ \u3055\u3089\u306b\u4e8c\u6b21\u5143\u76ee\u306e\u914d\u5217\u3067foreach\u3059\u308b\u3068\u3001\r\n\t\tSystem.out.println(e); \/\/ 1, 2, 3, 4, 5, 6\u3068\u9806\u756a\u306b\u51fa\u529b\u3055\u308c\u308b\r\n\t}\r\n}<\/pre>\n<p>List\u306e\u4f8b\u3067\u306f\u3001<span>List<\/span>\u5185\u306b\u4fdd\u6301\u3057\u3066\u3044\u308b\u578b\u3092\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u306e\u578b\u5909\u6570<span>(List&lt;Integer&gt;<\/span>\u306e<span>Integer)<\/span>\u3067\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u3067\u3059\u306e\u3067\u3001\u62e1\u5f35<span>for<\/span>\u6587\u3067\u306e\u5909\u6570\u306e\u578b\u3082<span>Integer<\/span>\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u914d\u5217\u3068\u540c\u3058\u3088\u3046\u306b\u3001\u4fdd\u6301\u3057\u3066\u3044\u308b\u578b\u3092\u9806\u306b\u53d6\u308a\u51fa\u3059\u306e\u3067\u3059\u304b\u3089\u3001\u4f8b\u3048\u3070<span>List<\/span>\u5185\u306b\u3055\u3089\u306b<span>List<\/span>\u3092\u4fdd\u6301\u3057\u3066\u3044\u308b\u306e\u306a\u3089\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ List\u306e\u4e2d\u306b\u3001\u3055\u3089\u306bList\u3092\u4fdd\u6301\u3057\u3066\u3044\u308b\u5834\u5408\u306e\u62e1\u5f35for\u6587\u306e\u4f8b\r\nList&lt;List&lt;Integer&gt;&gt; list = new ArrayList&lt;&gt;(); \/\/ List\u306e\u4e2d\u306b\u306f\u3001List&lt;Integer&gt;\u3092\u4fdd\u6301\u3057\u3066\u3044\u308b\r\nlist.add(Arrays.asList(1, 2, 3));\r\nlist.add(Arrays.asList(4, 5, 6));\r\n\r\nfor (List&lt;Integer&gt; sublist : list) { \/\/ List\u304b\u3089List&lt;Integer&gt;\u3092\u53d6\u308a\u51fa\u3057\u3066\u3001\r\n\tfor (Integer e : sublist) { \/\/ \u53d6\u308a\u51fa\u3057\u305fList&lt;Integer&gt;\u306eInteger\u3067foreach\u3059\u308b\u3068\u3001\r\n\t\tSystem.out.println(e); \/\/ 1, 2, 3, 4, 5, 6\u3068\u9806\u756a\u306b\u51fa\u529b\u3055\u308c\u308b\r\n\t}\r\n}<\/pre>\n<p>\u3061\u306a\u307f\u306b\u3001<span>List<\/span>\u306e\u5834\u5408\u3067\u578b\u5909\u6570\u3067\u306e\u4fdd\u6301\u3059\u308b\u578b\u3092\u6307\u5b9a\u3057\u3066\u3044\u306a\u3044\u306a\u3089\u3001\u53d6\u308a\u51fa\u3059\u5909\u6570\u306e\u578b\u306f<span>Object<\/span>\u3068\u306a\u308a\u307e\u3059\u3002<span>Object<\/span>\u306f\u5168\u3066\u306e\u30af\u30e9\u30b9\u306e\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u3067\u3059\u304b\u3089\u3001\u3069\u3093\u306a\u578b\u3067\u3082\u7121\u96e3\u306b\u4ee3\u5165\u3067\u304d\u308b\u304b\u3089\u3067\u3059\u306d\u3002<\/p>\n<p>\u3067\u3059\u304c\u3001<span>Object<\/span>\u306e\u5834\u5408\u306f\u30ad\u30e3\u30b9\u30c8\u304c\u5fc5\u8981\u306a\u3053\u3068\u304c\u307b\u3068\u3093\u3069\u3067\u3059\u306e\u3067\u3001\u5b9f\u4f53\u3068\u3057\u3066\u4f55\u3092\u683c\u7d0d\u3057\u3066\u3044\u308b\u304b\u5fd8\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u3046\u3057\u306a\u3044\u3068<span>ClassCastException<\/span>\u304c\u767a\u751f\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ List\u306b\u578b\u5909\u6570\u3092\u6307\u5b9a\u3057\u306a\u3044\u5834\u5408\u306fObject\u306b\u306a\u308b\r\nList list = Arrays.asList(1, 2, 3);\r\n\r\nfor (Object e : list) {\r\n\tInteger i = (Integer)e; \/\/ \u5165\u3063\u3066\u3044\u308b\u5024\u306fInteger\u306e\u306f\u305a\u306a\u306e\u3067\u3001\u30ad\u30e3\u30b9\u30c8\u3059\u308b\r\n\tSystem.out.println(i); \/\/ 1, 2, 3\u3068\u9806\u756a\u306b\u51fa\u529b\u3055\u308c\u308b\r\n}<\/pre>\n<h3><span id=\"-forwhile\">\uff11-\uff12\uff0efor\u6587<span>\/while<\/span>\u6587<\/span><\/h3>\n<p>for\u6587\u306b\u3088\u308b<span>foreach<\/span>\u3067\u306f\u3001\u4e00\u822c\u7684\u306b\u306f\u914d\u5217\u30fb\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u5909\u6570\u3067\u5897\u6e1b\u3055\u305b\u3066\u3001\u9806\u756a\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u4f8b\u3068\u3057\u3066\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3001\u826f\u304f\u3042\u308b\u3082\u306e\u3067\u3059\u306d\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">int[] array = {1, 2, 3};\r\n\r\nfor (int i = 0; i &lt; array.length; i++) {\r\n\tint e = array[i];\r\n\tSystem.out.println(e);\r\n}<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;Integer&gt; list = Arrays.asList(1, 2, 3);\r\n\r\nfor (int i = 0; i &lt; list.size(); i++) {\r\n\tInteger e = list.get(i);\r\n\tSystem.out.println(e);\r\n}<\/pre>\n<p>while\u6587\u3067<span>foreach<\/span>\u3092\u3059\u308b\u5834\u5408\u3001<span>while<\/span>\u6587\u81ea\u4f53\u306b\u306f\u914d\u5217\u3084\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u3092\u53d6\u308a\u51fa\u3059\u6a5f\u80fd\u306f\u306a\u3044\u306e\u3067\u3001\u6dfb\u3048\u5b57\u3084\u7279\u5b9a\u4f4d\u7f6e\u306e\u8981\u7d20\u3092\u53d6\u308a\u51fa\u3059\u30e1\u30bd\u30c3\u30c9\u3001\u307e\u305f\u306f\u5f8c\u8ff0\u3059\u308b<span>Iterator<\/span>\u3092\u5229\u7528\u3057\u305f\u30eb\u30fc\u30d7\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">int[] array = {1, 2, 3};\r\nint i = 0;\r\nwhile (i &lt; array.length) {\r\n\tint e = array[i];\r\n\tSystem.out.println(e);\r\n\ti++;\r\n}<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;Integer&gt; list = Arrays.asList(1, 2, 3);\r\nint i = 0;\r\nwhile (i &lt; list.size()) {\r\n\tInteger e = list.get(i);\r\n\tSystem.out.println(e);\r\n\ti++;\r\n}<\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u672c\u8cea\u7684\u306b\u306f\u884c\u3063\u3066\u3044\u308b\u3053\u3068\u306f<span>for<\/span>\u6587\u3068\u5909\u308f\u308a\u3042\u308a\u307e\u305b\u3093\u3002\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u4f7f\u3063\u3066\u3044\u308b\u5909\u6570\u306e\u5ba3\u8a00\u5834\u6240\u3068\u3001\u52a0\u7b97\u3092\u3057\u3066\u3044\u308b\u5834\u6240\u304c\u9055\u3046\u3060\u3051\u3067\u3059\u3002<\/p>\n<h3><span id=\"-Javaforwhile\">\uff11-\uff13\uff0e\u3010Java\u3011for\u6587<span>\/while<\/span>\u6587\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u7ba1\u7406<\/span><\/h3>\n<p>for\u6587<span>\/while<\/span>\u6587\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u7ba1\u7406\u3067\u3059\u3002\u5909\u6570\u3092\u4f7f\u3063\u3066\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u7ba1\u7406\u3092\u3059\u308b\u3053\u3068\u81ea\u4f53\u304c\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u4e0a\u306e\u30df\u30b9\u306b\u7e4b\u304c\u308b\u53ef\u80fd\u6027\u3092\u751f\u3080\u306e\u3067\u3059\u3002<\/p>\n<p>\u3053\u3053\u307e\u3067\u306e\u4f8b\u306e\u3068\u304a\u308a\u3001\u914d\u5217\u3084\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3078\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u3063\u3066\u30a2\u30af\u30bb\u30b9\u3057\u307e\u3059\u3002\u305d\u308c\u3089\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f<span>int<\/span>\u306a\u3069\u306e\u5909\u6570\u3067\u8868\u73fe\u3057\u3001\u30eb\u30fc\u30d7\u5185\u3067\u6570\u5024\u3092\u5897\u6e1b\u3055\u305b\u307e\u3059\u3002<\/p>\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u5909\u6570\u3067\u8868\u73fe\u3059\u308b\u3068\u3001\u4f8b\u3048\u3070\u8981\u7d20\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092<span>1<\/span>\u500b\u98db\u3070\u3057\u306b\u3067\u304d\u307e\u3059\u3057\u3001\u5148\u8aad\u307f\u3082\u3067\u304d\u308b\u306e\u3067\u3001\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u67d4\u8edf\u306b\u4f5c\u308c\u307e\u3059\u3002\u3067\u3059\u304b\u3089\u3001<span>for<\/span>\u6587<span>\/while<\/span>\u6587\u3092\u4f7f\u3046\u3053\u3068\u306f\u3053\u308c\u304b\u3089\u3082\u306a\u304f\u306a\u3089\u306a\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u914d\u5217\u30fb\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8d85\u3048\u305f\u30a2\u30af\u30bb\u30b9\u3092<span>Java<\/span>\u306e\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u30c1\u30a7\u30c3\u30af\u3057\u307e\u305b\u3093\u306e\u3067<span>(<\/span>\u5b9f\u884c\u6642\u306b\u306f\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059<span>)<\/span>\u3001<span>for<\/span>\u6587<span>\/while<\/span>\u6587\u3092\u4f7f\u3063\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u6b63\u3057\u304f\u52d5\u304f\u304b\u3069\u3046\u304b\u306f\u3001\u5b9f\u969b\u306b\u52d5\u304b\u3055\u306a\u3044\u3068\u5206\u304b\u308a\u307e\u305b\u3093\u3002\u305d\u308c\u306b\u3001\u5b9f\u969b\u306b\u306f\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u6280\u91cf\u306b\u5927\u304d\u304f\u4f9d\u5b58\u3057\u3066\u3057\u307e\u3046\u306e\u304c\u5b9f\u72b6\u3067\u3059\u3002<\/p>\n<h2><span id=\"foreachJava_7\">\uff12\uff0e\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u3088\u308b<span>foreach(Java 7<\/span>\u307e\u3067<span>)<\/span><\/span><\/h2>\n<p>\u3053\u3053\u304b\u3089\u306f\u7d14\u7c8b\u306a<span>Java<\/span>\u306e\u69cb\u6587\u3067\u306f\u306a\u304f\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u63d0\u4f9b\u3059\u308b\u6a5f\u80fd\u3092\u7d44\u307f\u5408\u308f\u305b\u305f<span>foreach<\/span>\u6587\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u307e\u3060<span>for<\/span>\u6587\u3084<span>while<\/span>\u6587\u3092\u8a18\u8ff0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u914d\u5217\u3084\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u610f\u8b58\u305b\u305a\u306b<span>foreach<\/span>\u3067\u304d\u308b\u306e\u304c\u3001\u5927\u304d\u306a\u6539\u5584\u70b9\u3067\u3059\u3002<\/p>\n<h3><span id=\"-Iterator\">\uff12-\uff11\uff0eIterator<\/span><\/h3>\n<p>Java 1.2\u3067\u8ffd\u52a0\u3055\u308c\u305f\u306e\u304cjava.util.Iterator\u3067\u3059\u3002\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u5185\u5bb9\u3092\u9806\u756a\u306b\u5168\u3066\u53d6\u308a\u51fa\u3057\u3066\u51e6\u7406\u3092\u5b9f\u884c\u3057\u305f\u3044\u6642\u306b\u4f7f\u3044\u307e\u3059\u3002Iterator\u306fJava 1.2\u3067Java Collections Framework\u304c\u6574\u5099\u3055\u308c\u305f\u969b\u306b\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ Iterator\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\r\nboolean hasNext()\r\n\t\u53cd\u5fa9\u51e6\u7406\u3067\u3055\u3089\u306b\u8981\u7d20\u304c\u3042\u308b\u5834\u5408\u306btrue\u3092\u8fd4\u3057\u307e\u3059\u3002\r\nE next()\r\n\t\u53cd\u5fa9\u51e6\u7406\u3067\u6b21\u306e\u8981\u7d20\u3092\u8fd4\u3057\u307e\u3059\u3002(\u203bE\u306f\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u306e\u578b\u5909\u6570\u3067\u3059)\r\nvoid remove()\r\n\t\u30d9\u30fc\u30b9\u3068\u306a\u308b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304b\u3089\u3001\u3053\u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u306b\u3088\u3063\u3066\u6700\u5f8c\u306b\u8fd4\u3055\u308c\u305f\u8981\u7d20\u3092\u524a\u9664\u3057\u307e\u3059(\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u64cd\u4f5c)\u3002<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ while\u6587\u3092\u4f7f\u3046\u5834\u5408\r\nList&lt;Integer&gt; list = Arrays.asList(1, 2, 3);\r\nIterator&lt;Integer&gt; it = list.iterator(); \/\/ List\u304b\u3089Iterator\u3092\u53d6\u5f97\u3059\u308b\r\n\r\nwhile (it.hasNext()) { \/\/ Iterator\u306b\u300c\u6b21\u300d\u306e\u8981\u7d20\u304c\u3042\u308b\u304b\u78ba\u8a8d\u3057\u3001\r\n\tInteger e = it.next(); \/\/ Iterator\u304b\u3089\u53d6\u308a\u51fa\u3059\r\n\tSystem.out.println(e);\r\n}<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ for\u6587\u3092\u4f7f\u3046\u5834\u5408\r\nList&lt;Integer&gt; list = Arrays.asList(1, 2, 3);\r\n\r\nfor (Iterator&lt;Integer&gt; it = list.iterator(); it.hasNext();) { \/\/ Iterator\u306e\u53d6\u308a\u51fa\u3057\u3068\u3001hasNext\u3092\uff11\u884c\u3067\u66f8\u304f\r\n\tInteger e = it.next();\r\n\tSystem.out.println(e);\r\n}<\/pre>\n<p>List\u3084<span>Set<\/span>\u306e\u3088\u3046\u306a\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306a\u3069\u304b\u3089<span>Iterator<\/span>\u3092\u751f\u6210\u3057\u3001\u6b21\u306e\u8981\u7d20\u304c\u3042\u308b\u304b\u554f\u3044\u5408\u308f\u305b<span>(Iterator.hasNext())<\/span>\u3001\u3042\u308b\u306a\u3089\u53d6\u308a\u51fa\u3059<span>(Iterator.next())\u2026<\/span>\u3068\u3044\u3046\u64cd\u4f5c\u3092\u7d9a\u3051\u307e\u3059\u3002\u3067\u3059\u306e\u3067\u3001<span>Iterator<\/span>\u3092\u4f7f\u3046\u306a\u3089<span>for<\/span>\u6587\u3084<span>while<\/span>\u6587\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u304c\u5fc5\u9808\u3068\u306a\u308a\u307e\u3059<span>(<\/span>\u3069\u3061\u3089\u3092\u4f7f\u3046\u304b\u306f\u304a\u597d\u307f\u3067<span>)<\/span>\u3002<\/p>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u898b\u3066\u9802\u3051\u308c\u3070\u308f\u304b\u308b\u3068\u304a\u308a\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304b\u3089\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u3088\u308b\u8981\u7d20\u306e\u53d6\u51fa\u3057\u304c\u4e0d\u8981\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u4eca\u3069\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u8981\u7d20\u3092\u51e6\u7406\u3057\u3066\u3044\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u610f\u8b58\u3057\u306a\u304f\u3066\u3082\u826f\u3044\u306e\u3067\u3059\u3002<\/p>\n<p>Iterator\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u30af\u30e9\u30b9\u306f\u6570\u591a\u304f\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u6a19\u6e96<span>API<\/span>\u306a\u3044\u3057\u69d8\u3005\u306a\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e<span>API<\/span>\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u3088\u304f\u8aad\u3093\u3067\u307f\u308b\u3068\u3001\u610f\u5916\u306a\u767a\u898b\u304c\u3042\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u306d\u3002\u6163\u7fd2\u7684\u306b\u306f<span>iterator()<\/span>\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u540d\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001Iterator\u3067\u306f\u8981\u7d20\u306e\u524a\u9664(Iterator.remove())\u3082\u884c\u3048\u307e\u3059\u3002\u3053\u308c\u306f\u62e1\u5f35for\u6587\u3067\u306f\u7c21\u5358\u306b\u306f\u3067\u304d\u306a\u3044\u3053\u3068\u3067\u3059\u3002\u30eb\u30fc\u30d7\u4e2d\u306b\u524a\u9664\u5224\u65ad\u304c\u3067\u304d\u3001\u3055\u3089\u306b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u64cd\u4f5c\u6642\u306e\u30ab\u30a6\u30f3\u30bf\u64cd\u4f5c\u304c\u4e0d\u8981\u306a\u306e\u3067\u3001\u3068\u3066\u3082\u4f7f\u3044\u3084\u3059\u3044\u3067\u3059\u306d\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;Integer&gt; list = Arrays.asList(1, 2, 3);\r\nIterator&lt;Integer&gt; it = list.iterator();\r\n\r\nwhile (it.hasNext()) {\r\n\tInteger e = it.next();\r\n\tSystem.out.println(e);\r\n\tif (e == 2) { \/\/ \u5024\u304c2\u306a\u3089List\u304b\u3089\u524a\u9664\u3059\u308b\r\n\t\tit.remove();\r\n\t}\r\n}\r\n\r\nSystem.out.println(list); \/\/ \u2192 [1, 3] 2\u3060\u3051\u304c\u524a\u9664\u3055\u308c\u305f<\/pre>\n<h3><span id=\"-Iterator-2\">\uff12-\uff12\uff0eIterator\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u304f\u90e8\u5206\u304c\u307e\u3060\u591a\u3044\u3053\u3068<\/span><\/h3>\n<p>\u4fbf\u5229\u306a<span>Iterator<\/span>\u3067\u3059\u304c\u3001\u30c7\u30e1\u30ea\u30c3\u30c8\u306f\u30eb\u30fc\u30d7\u69cb\u6587\u304c\u307e\u3060\u4e8b\u5b9f\u4e0a\u5fc5\u9808\u306a\u3068\u3053\u308d\u3068\u3001\u81ea\u5206\u3067\u8981\u7d20\u3092\u53d6\u308a\u51fa\u3055\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3068\u3053\u308d\u3067\u3059\u3002\u3055\u3089\u306b\u3001\u305d\u308c\u3089\u3092\u66f8\u304b\u306a\u304f\u3066\u3082\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u3067\u304d\u308b\u306e\u3067\u3001\u76f8\u5909\u308f\u3089\u305a\u5b9f\u884c\u3057\u3066\u307f\u306a\u3051\u308c\u3070\u6b63\u3057\u304f\u52d5\u304f\u304b\u5206\u304b\u3089\u306a\u3044\u3068\u3044\u3046\u70b9\u3067\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001<span>Iterator<\/span>\u304c\u62e1\u5f35<span>for<\/span>\u6587\u306b\u52a3\u308b\u306e\u306f\u3001<span>Iterator.hasNext()<\/span>\u3084<span>Iterator.next()<\/span>\u3092\u304d\u3061\u3093\u3068\u547c\u3073\u51fa\u305b\u3066\u3044\u308b\u304b\u3001\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u304c\u5e38\u306b\u610f\u8b58\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3068\u3053\u308d\u3067\u3059\u3002\u305f\u3060\u3001\u30eb\u30fc\u30d7\u306e\u5236\u5fa1\u3068\u3044\u3046\u9762\u3067\u306f\u62e1\u5f35<span>for<\/span>\u6587\u3088\u308a\u306f\u67d4\u8edf\u306b\u66f8\u3051\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u9069\u6750\u9069\u6240\u3068\u3044\u3046\u611f\u3058\u3067\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u3063\u3066\u3044\u308b\u5074\u304b\u3089\u3059\u308b\u3068\u300c\u5358\u306b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067<span>foreach<\/span>\u3057\u305f\u3044\u3060\u3051\u306a\u306e\u306b\u6ce8\u610f\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3053\u3068\u304c\u591a\u3044\u306e\u306f\u9762\u5012\u304f\u3055\u3044\u306a\u3041\u300d\u3068\u3044\u3046\u5370\u8c61\u306f\u307e\u3060\u6b8b\u308a\u307e\u3059\u3002<\/p>\n<h3><span id=\"-Enumeration\">\uff12-\uff13\uff0e\u3010\u53c2\u8003\u3011Enumeration<\/span><\/h3>\n<p>java.util.Enumeration\u3068\u3044\u3046\u3082\u306e\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306fJava 1.0\u306e\u6642\u4ee3\u304b\u3089\u5b58\u5728\u3057\u3066\u3044\u307e\u3057\u305f\u3002Iterator\u306fEnumeration\u306e\u4ee3\u308f\u308a\u306b\u5c0e\u5165\u3055\u308c\u305f\u3082\u306e\u3067\u3059\u3002\u4f7f\u3044\u65b9\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Vector&lt;Integer&gt; vector = new Vector&lt;&gt;();\r\nvector.add(1);\r\nvector.add(2);\r\nvector.add(3);\r\nEnumeration&lt;Integer&gt; enumeration = vector.elements();\r\n\r\nwhile (enumeration.hasMoreElements()) {\r\n\tInteger e = enumeration.nextElement();\r\n\tSystem.out.println(e);\r\n}<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">Vector&lt;Integer&gt; vector = new Vector&lt;&gt;();\r\nvector.add(1);\r\nvector.add(2);\r\nvector.add(3);\r\n\r\nfor (Enumeration&lt;Integer&gt; enumeration = vector.elements(); enumeration.hasMoreElements(); ) {\r\n\tInteger e = enumeration.nextElement();\r\n\tSystem.out.println(e);\r\n}<\/pre>\n<p>Iterator\u3068\u540c\u69d8\u306b\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304b\u3089\u547c\u3073\u51fa\u3057\u305fEnumeration\u306b\u3001\u6b21\u306e\u8981\u7d20\u304c\u3042\u308b\u304b\u554f\u3044\u5408\u308f\u305b(Enumeration.hasMoreElements())\u3001\u3042\u308b\u306a\u3089\u53d6\u308a\u51fa\u3059(Enumeration.nextElement())\u2026\u3068\u3044\u3046\u64cd\u4f5c\u3092\u7d9a\u3051\u307e\u3059\u3002\u3067\u3059\u306e\u3067\u3001\u3053\u308c\u307e\u305ffor\u6587\u3084while\u6587\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u304c\u5fc5\u9808\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4f7f\u3044\u65b9\u81ea\u4f53\u306f<span>Iterator<\/span>\u3068\u307b\u307c\u540c\u3058\u3067\u3059\u304c\u3001\u5143\u3068\u306a\u308b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3078\u306e\u524a\u9664\u64cd\u4f5c<span>(remove)<\/span>\u304c\u306a\u3044\u306e\u3068\u3001\u30e1\u30bd\u30c3\u30c9\u540d\u304c\u5c11\u3057\u9577\u3044\u306e\u304c\u9055\u3044\u3067\u3059\u3002\u4eca\u306f<span>Enumeration<\/span>\u306f\u6a19\u6e96<span>API<\/span>\u5185\u3067\u306f\u65b0\u3057\u304f\u4f7f\u308f\u308c\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u306e\u3067\u3001\u540c\u3058\u3053\u3068\u3092\u3084\u308a\u305f\u3044\u306a\u3089<span>Iterator<\/span>\u3092\u4f7f\u3046\u306e\u304c\u666e\u901a\u3067\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001<span>Enumeration<\/span>\u304b\u3089<span>Iterator<\/span>\u3092\u751f\u6210\u3059\u308b\u30e1\u30bd\u30c3\u30c9<span>(Enumeraiton.asIterator())<\/span>\u304c<span>Java 9<\/span>\u304b\u3089\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u306e\u3067\u3001\u4f7f\u3063\u3066\u307f\u3066\u3082\u826f\u3044\u3067\u3057\u3087\u3046\u306d\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Vector&lt;Integer&gt; vector = new Vector&lt;&gt;();\r\nvector.add(1);\r\nvector.add(2);\r\nvector.add(3);\r\nEnumeration&lt;Integer&gt; enumeration = vector.elements();\r\nIterator&lt;Integer&gt; it = enumeration.asIterator();\r\n\r\nwhile (it.hasNext()) {\r\n\tInteger e = it.next();\r\n\tSystem.out.println(e);\r\n}<\/pre>\n<h2><span id=\"JavaforeachJava_8\">\uff13\uff0e\u3010Java\u3011\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u3088\u308b<span>foreach(Java 8<\/span>\u4ee5\u964d<span>)<\/span><\/span><\/h2>\n<p>Java 8\u3067\u3001\u30eb\u30fc\u30d7\u69cb\u6587\u3092\u4f7f\u308f\u305a\u306b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3084\u914d\u5217\u306e\u5404\u8981\u7d20\u3078\u51e6\u7406\u3067\u304d\u308b\u69cb\u6587\u3068\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u8ffd\u52a0\u30fb\u6574\u5099\u3055\u308c\u307e\u3057\u305f\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3001\u30e9\u30e0\u30c0\u5f0f\u3001\u30e1\u30bd\u30c3\u30c9\u53c2\u7167\u3001\u305d\u3057\u3066<span>Stream API<\/span>\u3067\u3059\u3002<\/p>\n<p>Stream API\u306e\u5927\u304d\u306a\u7279\u5fb4\u306f\u3001\u305d\u3082\u305d\u3082\u306e\u76ee\u7684\u304c<span>foreach<\/span>\u7684\u306a\u51e6\u7406\u3092\u884c\u3046\u305f\u3081\u306e<span>API<\/span>\u3060\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<span>Stream API<\/span>\u306e\u6982\u5ff5\u3084\u4e2d\u9593\u51e6\u7406\u30fb\u7d42\u7aef\u51e6\u7406\u306a\u3069\u306b\u95a2\u3057\u3066\u306f\u3053\u3053\u3067\u306f\u8a73\u7d30\u306f\u8ff0\u3079\u307e\u305b\u3093\u306e\u3067\u3001\u5225\u9014\u8abf\u3079\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u9762\u767d\u3044\u3067\u3059\u3088\u3002<\/p>\n<p>\u3053\u3053\u3067\u306f\u3001<span>foreach<\/span>\u6587\u7684\u306b\u4f7f\u3048\u308b<span>Stream API<\/span>\u306e\u7d42\u7aef\u51e6\u7406\u306e\u4e00\u3064\u300c<span>Stream.forEach(Consumer)<\/span>\u300d\u3092\u4e2d\u5fc3\u306b\u3001\u300c<span>Iterable.forEach(Consumer)<\/span>\u300d\u3068\u300c<span>Iterator.forEachRemaining(Consumer)<\/span>\u300d\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h3><span id=\"-StreamforEachConsumer\">\uff13-\uff11\uff0eStream.forEach(Consumer)<\/span><\/h3>\n<h4>\uff13-\uff11-\uff11\uff0eStream.forEach(Consumer)\u306e\u4f8b<\/h4>\n<p>List\u306a\u3069\u306eStream\u3092\u751f\u6210\u3067\u304d\u308b\u30af\u30e9\u30b9\u304b\u3089Stream\u3092\u751f\u6210\u3057\u3066forEach()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3068\u3001Stream\u5185\u306b\u3042\u308b\u5168\u8981\u7d20\u306bforEach()\u306e\u5f15\u6570\u3068\u3057\u305fConsumer\u306b\u3088\u308b\u51e6\u7406\u304c\u9069\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ Stream.forEach()\u306e\u30e1\u30bd\u30c3\u30c9\u30b7\u30b0\u30cd\u30c1\u30e3\u3001\u3044\u305a\u308c\u3082Consumer\u3092\u5f15\u6570\u306b\u53d6\u308b\r\nvoid forEach(Consumer&lt;? super T&gt; action);\r\nvoid forEachOrdered(Consumer&lt;? super T&gt; action);<\/pre>\n<p>Stream.forEach()\u306e\u5f15\u6570\u3067\u3042\u308b<span>Consumer<\/span>\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b<span>1<\/span>\u3064\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306e\u307f\u5b9a\u7fa9\u3055\u308c\u305f\u300c\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u300d\u3067\u3059\u3002<span>Consumer<\/span>\u306f\u3001\u53d7\u3051\u53d6\u3063\u305f\u5f15\u6570\u3078\u306e\u4f55\u304b\u306e\u300c\u51e6\u7406\u300d\u3092\u8868\u73fe\u3057\u3066\u3044\u308b\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public interface Consumer&lt;T&gt; {\r\n    void accept(T t);\r\n}<\/pre>\n<p>Stream.forEach(Consumer)\u306e\u5b9f\u884c\u4f8b\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002\u3053\u306e\u4f8b\u3067\u306fConsumer\u3092\u30e9\u30e0\u30c0\u5f0f\u30fb\u30e1\u30bd\u30c3\u30c9\u53c2\u7167\u30fb\u901a\u5e38\u306e\u30af\u30e9\u30b9\u306e3\u30d1\u30bf\u30fc\u30f3\u3067\u751f\u6210\u3057\u3066\u3044\u307e\u3059\u3002\u30e9\u30e0\u30c0\u5f0f\u3068\u30e1\u30bd\u30c3\u30c9\u53c2\u7167\u306f\u3071\u3063\u3068\u898b\u3067\u306f\u5206\u304b\u308a\u3065\u3089\u3044\u3067\u3059\u304c\u3001\u7d50\u5c40\u306fConsumer\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u3092\u7c21\u6613\u7684\u306b\u751f\u6210\u3059\u308b\u305f\u3081\u306e\u7cd6\u8863\u69cb\u6587\u306b\u904e\u304e\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;Integer&gt; list = Arrays.asList(1, 2, 3);\r\nlist.stream().forEach(e -&gt; System.out.println(e)); \/\/ 1, 2, 3\u304c\u51fa\u529b\u3055\u308c\u308b(\u30e9\u30e0\u30c0\u5f0f\u3067Consumer\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210)\r\nlist.stream().forEach(System.out::println); \/\/ 1, 2, 3\u304c\u51fa\u529b\u3055\u308c\u308b(\u30e1\u30bd\u30c3\u30c9\u53c2\u7167\u3067Consumer\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210)\r\n\r\n\/\/ \u5206\u304b\u308a\u3084\u3059\u304f\u3059\u308b\u305f\u3081\u306b\u3001\u30e9\u30e0\u30c0\u5f0f\u30fb\u30e1\u30bd\u30c3\u30c9\u53c2\u7167\u3092\u4f7f\u308f\u306a\u3044\u66f8\u304d\u65b9\u3082\u3057\u3066\u307f\u307e\u3059\u3002\r\n\/\/ \u4e0a\u306e\u4f8b\u3068\u5b9f\u8cea\u7684\u306b\u306f\u540c\u3058\u3053\u3068\u3092\u3057\u3066\u3044\u307e\u3059\u3002\r\nclass SampleConsumer implements Consumer&lt;Integer&gt; {\r\n\tvoid accept(Integer e) {\r\n\t\tSystem.out.println(e);\r\n\t}\r\n}\r\nConsumer&lt;Integer&gt; c = new SampleConsumer();\r\nlist.stream().forEach(c);<\/pre>\n<p>\u898b\u3066\u308f\u304b\u308b\u3068\u304a\u308a\u3001<span>for<\/span>\u6587<span>\/<\/span>\u62e1\u5f35<span>for<\/span>\u6587<span>\/while<\/span>\u6587<span>\/Iterator<\/span>\u306b\u6bd4\u3079\u3066\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u683c\u6bb5\u306b\u77ed\u304f\u306a\u308a\u307e\u3057\u305f\u3002\u5143\u3005\u306f\u8907\u6570\u884c\u304c\u5fc5\u8981\u306a\u3068\u3053\u308d\u3092<span>1<\/span>\u884c\u3067\u66f8\u3051\u3066\u3044\u307e\u3059\u3002\u305d\u308c\u306b\u3001<span>1<\/span>\u756a\u76ee\u306e<span>forEach<\/span>\u306f\u5909\u6570<span>e<\/span>\u306e\u578b\u3092<span>(<\/span>\u898b\u305f\u76ee\u4e0a\u306f<span>)<\/span>\u5ba3\u8a00\u3057\u3066\u304a\u3089\u305a\u3001<span>2<\/span>\u756a\u76ee\u306e<span>forEach<\/span>\u306b\u81f3\u3063\u3066\u306f\u8981\u7d20\u304b\u3089\u53d6\u308a\u51fa\u3059\u5909\u6570\u306e\u5ba3\u8a00\u3059\u3089\u884c\u3063\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n<h4>\uff13-\uff11-\uff12\uff0eStream API\u306e\u7279\u5fb4\u306f\u30eb\u30fc\u30d7\u69cb\u6587\u304c\u4e0d\u8981\u306a\u3053\u3068<\/h4>\n<p>Stream.forEach(Consumer)\u3067\u306f\u3001\u4eca\u307e\u3067\u306efor\u6587\/\u62e1\u5f35for\u6587\/while\u6587\/Iterator\u3067\u5fc5\u8981\u3060\u3063\u305f\u30eb\u30fc\u30d7\u69cb\u6587\u304c\u4e0d\u8981\u3067\u3059\u3002<\/p>\n<p>Steam API\u3067\u306f\u300c\u51e6\u7406\u300d\u3092\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3068\u3057\u3066\u751f\u6210\u3057\u3001<span>Stream<\/span>\u5185\u306e\u5404\u8981\u7d20\u306b\u51e6\u7406\u3092\u300c\u9069\u7528\u300d\u3057\u307e\u3059\u3002\u5f93\u6765\u306e\u65b9\u6cd5\u3067\u306f\u7e70\u308a\u8fd4\u3057\u306e\u30eb\u30fc\u30d7\u69cb\u6587\u304c\u5148\u306b\u3042\u308a\u3001\u305d\u306e\u4e2d\u3067\u7e70\u308a\u8fd4\u3059\u8981\u7d20\u3092\u300c\u53d6\u308a\u51fa\u3057\u3066\u300d\u51e6\u7406\u3092\u3057\u307e\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a<span>Stream API<\/span>\u306f\u3001\u5f93\u6765\u306e\u30eb\u30fc\u30d7\u69cb\u6587\u3084<span>Iterator<\/span>\u3068\u7e70\u308a\u8fd4\u3057\u306e\u8003\u3048\u65b9\u305d\u306e\u3082\u306e\u304c\u9055\u3063\u3066\u3044\u308b\u306e\u3067\u3059\u3002\u3053\u308c\u3092\u6b63\u3057\u304f\u7406\u89e3\u3057\u306a\u3044\u3068\u3001\u75db\u3044\u76ee\u3092\u898b\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u306a\u304a\u3001for\u6587\/while\u6587\u3067\u306f\u3067\u304d\u3066\u3044\u305fcontinue\u3084break\u304cStream API\u3067\u306f\u3067\u304d\u307e\u305b\u3093\u3002return\u3067\u30e1\u30bd\u30c3\u30c9\u3092\u7d42\u4e86\u3059\u308b\u306e\u306fcontinue\u306b\u6bd4\u8f03\u7684\u8fd1\u3044\u610f\u5473\u306b\u306a\u308a\u307e\u3059\u304c\u3001break\u306e\u4ee3\u308f\u308a\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\u3067\u3059\u306e\u3067\u3001\u5f93\u6765\u306e\u69cb\u6587\u3068\u306e\u4f7f\u3044\u5206\u3051\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;Integer&gt; list = Arrays.asList(1, 2, 3);\r\nlist.stream().forEach(e -&gt; {\r\n\tif (e == 2) {\r\n\t\treturn; \/\/ continue\u306e\u4ee3\u308f\u308a\u306breturn\u3057\u3066\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u884c\u3092\u7d42\u308f\u3089\u305b\u308b\r\n\t}\r\n\tSystem.out.println(e);\r\n});<\/pre>\n<p>\u305d\u308c\u306b\u3001<span>for<\/span>\u6587<span>\/while<\/span>\u6587\u3067\u306f\u3067\u304d\u308b\u3001<span>1<\/span>\u3064\u524d\u30fb<span>1<\/span>\u3064\u5f8c\u306a\u3069\u306e\u4ed6\u8981\u7d20\u306e\u53c2\u7167\u304c\u3067\u304d\u307e\u305b\u3093\u3002\u3042\u304f\u307e\u3067\u4e00\u3064\u4e00\u3064\u306e\u8981\u7d20\u3078\u51e6\u7406\u3092\u9069\u7528\u3059\u308b\u306e\u307f\u3067\u3059\u3002\u3053\u308c\u3082<span>Stream API<\/span>\u306e\u5927\u304d\u306a\u5236\u7d04\u306a\u306e\u3067\u3001\u5168\u3066\u3092<span>Stream API<\/span>\u3067\u5b9f\u88c5\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u3053\u3068\u306f\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3><span id=\"-IterableforEachConsumer\">\uff13-\uff12\uff0eIterable.forEach(Consumer)<\/span><\/h3>\n<p>Java 8\u3067\u306f\u3001Iterable\u5358\u4f53\u3067\u3082\u5404\u8981\u7d20\u3078\u306e\u51e6\u7406\u304c\u3067\u304d\u308b\u30e1\u30bd\u30c3\u30c9\u300cIterable.forEach(Consumer)\u300d\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u308c\u3092\u4f7f\u3048\u3070\u3001Iterator\u81ea\u4f53\u306e\u51fa\u756a\u304c\u5927\u304d\u304f\u6e1b\u308a\u305d\u3046\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;Integer&gt; list = Arrays.asList(1, 2, 3); \/\/ List\u306fIterable\u3092\u7d99\u627f\u3057\u3066\u3044\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9!!\r\nlist.forEach(e -&gt; System.out.println(e)); \/\/ \u2192 1, 2, 3<\/pre>\n<p>\u3053\u308c\u3060\u3068<span>Iterator<\/span>\u3067\u306f\u30eb\u30fc\u30d7\u3055\u305b\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u51e6\u7406\u3092<span>1<\/span>\u884c\u3067\u66f8\u3051\u3066\u3044\u307e\u3059\u3002\u7e70\u308a\u8fd4\u3057\u5b9f\u884c\u3057\u305f\u3044\u51e6\u7406\u306e\u90e8\u5206\u3060\u3051\u3092<span>Consumer<\/span>\u3067\u66f8\u3051\u3070\u3044\u3044\u306e\u3067\u3059\u3002<span>Stream<\/span>\u306b\u3088\u308b\u4e2d\u9593\u51e6\u7406\u304c\u4e0d\u8981\u306a\u306e\u3067\u3042\u308c\u3070\u3001\u3053\u308c\u3092\u4f7f\u3046\u306e\u304c\u7c21\u5358\u3067\u3059\u306d\u3002<\/p>\n<h3><span id=\"i\">\uff13-\uff13\uff0e\u30eb\u30fc\u30d7\u69cb\u6587\u304b\u3089\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u6d3b\u7528\u3078<\/span><\/h3>\n<p>\u3053\u306e\u7ae0\u3067\u7d39\u4ecb\u3057\u305f\u3082\u306e\u306f\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3068\u30e9\u30e0\u30c0\u5f0f\u3092\u6d3b\u7528\u3057\u3066\u3044\u307e\u3057\u305f\u3002\u3053\u308c\u306f<span>Java<\/span>\u306b\u304a\u3051\u308b\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306e\u8003\u3048\u65b9\u304c\u5909\u308f\u3063\u3066\u304d\u3066\u3044\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u524d\u8ff0\u306e\u3068\u304a\u308a\u3001<span>for\/while\/Iterator(<\/span>\u65e7\u69cb\u6587<span>)<\/span>\u306e\u5834\u5408\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u7ba1\u7406\u3084\u6b21\u8981\u7d20\u306e\u6709\u7121\u306e\u78ba\u8a8d\u3001\u30eb\u30fc\u30d7\u5185\u3067\u306e\u53c2\u7167\u7528\u5909\u6570\u3078\u306e\u4ee3\u5165\u306a\u3069\u304c\u5fc5\u8981\u3067\u3059\u3002\u305d\u308c\u3089\u306f\u3001\u7e70\u308a\u8fd4\u3057\u305f\u3044\u51e6\u7406\u81ea\u4f53\u306b\u306f\u76f4\u63a5\u95a2\u4fc2\u3057\u306a\u3044\u3051\u308c\u3069\u3082\u3001\u66f8\u304b\u306a\u3051\u308c\u3070\u52d5\u304b\u305b\u306a\u3044\u304b\u3089\u66f8\u3044\u3066\u3044\u308b\u3082\u306e\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u3044\u308f\u3086\u308b\u30dc\u30a4\u30e9\u30fc\u30d7\u30ec\u30fc\u30c8\u3067\u3059\u3002<\/p>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30d0\u30b0\u304c\u767a\u751f\u3059\u308b\u7b87\u6240\u306f\u3001\u3080\u308d\u3093\u51e6\u7406\u672c\u4f53\u3082\u3067\u3059\u304c\u3001\u30dc\u30a4\u30e9\u30fc\u30d7\u30ec\u30fc\u30c8\u90e8\u5206\u3067\u3042\u308b\u3053\u3068\u3082\u591a\u3044\u3082\u306e\u3067\u3059\u3002\u914d\u5217\u306a\u3069\u3092\u53c2\u7167\u3059\u308b\u305f\u3081\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u7ba1\u7406\u3092\u30df\u30b9\u3059\u308b\u306e\u304c\u305d\u306e\u6700\u305f\u308b\u3082\u306e\u3067\u3059\u3002\u4f8b\u3048\u3070\u591a\u6b21\u5143\u914d\u5217\u3092\u6271\u3046\u969b\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u7ba1\u7406\u306f\u7d50\u69cb\u96e3\u3057\u3044\u3067\u3059\u3088\u306d\u3002<\/p>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u3051\u3070\u5fc5\u305a\u30df\u30b9\u3092\u3057\u307e\u3059\u3002\u540c\u3058\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3042\u308c\u3070\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u304f\u91cf\u305d\u306e\u3082\u306e\u304c\u5c11\u306a\u3044\u307b\u3069\u30df\u30b9\u3092\u3059\u308b\u53ef\u80fd\u6027\u304c\u4e0b\u304c\u308a\u307e\u3059\u3002\u6700\u8fd1\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306e\u30c8\u30ec\u30f3\u30c9\u306f\u3001\u305d\u306e\u3088\u3046\u306a\u30df\u30b9\u3092\u751f\u3080\u53ef\u80fd\u6027\u304c\u3042\u308b\u8a18\u8ff0\u3092\u6975\u529b\u6392\u9664\u3059\u308b\u3053\u3068\u3068\u3001\u30df\u30b9\u3092\u305d\u3082\u305d\u3082\u8d77\u3053\u305b\u306a\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u69cb\u6587\u306e\u63a1\u7528\u3067\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001<span>Consumer<\/span>\u306a\u3069\u306e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u5c0e\u5165\u76ee\u7684\u306f\u3001\u51e6\u7406\u3057\u305f\u3044\u3053\u3068\u3092\u7d30\u304b\u304f\u5206\u3051\u3066\u8a18\u8ff0\u3059\u308b\u30b9\u30bf\u30a4\u30eb\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u3059\u308b\u305f\u3081\u3067\u3059\u3002\u5927\u304d\u304f\u9577\u3044\u30eb\u30fc\u30d7\u5185\u3067\u305f\u304f\u3055\u3093\u306e\u51e6\u7406\u3092\u4e00\u5ea6\u306b\u66f8\u304f\u306e\u3067\u306f\u306a\u304f\u3001\u518d\u5229\u7528\u3067\u304d\u308b\u5c0f\u3055\u306a\u51e6\u7406\u3092\u305f\u304f\u3055\u3093\u7e4b\u304e\u5408\u308f\u305b\u308b\u306e\u304c\u3001\u6700\u8fd1\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u6f6e\u6d41\u306a\u306e\u3067\u3059\u3002<\/p>\n<h3><span id=\"-IteratorforEachRemainingConsumer\">\uff13-\uff14\uff0e\u3010\u53c2\u8003\u3011Iterator.forEachRemaining(Consumer)<\/span><\/h3>\n<p>\u524d\u8ff0\u306e\u3068\u304a\u308a\u3001<span>Iterator<\/span>\u3092\u4f7f\u3046\u969b\u306f\u30eb\u30fc\u30d7\u69cb\u6587\u3068\u30bb\u30c3\u30c8\u306b\u306a\u308b\u306e\u304c<span>Java 7<\/span>\u307e\u3067\u306e\u5e38\u8b58\u3067\u3057\u305f\u3002\u3067\u3059\u304c\u3001<span>Java 8<\/span>\u3067\u30eb\u30fc\u30d7\u4e0d\u8981\u3067\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3078\u306e\u8981\u7d20\u3054\u3068\u306b\u51e6\u7406\u3092\u5b9f\u884c\u3067\u304d\u308b\u30e1\u30bd\u30c3\u30c9\u300c<span>Iterator.forEachRemaining(Consumer)<\/span>\u300d\u304c\u8ffd\u52a0\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4f7f\u3044\u65b9\u306f\u524d\u8ff0\u3057\u305fIteratable.forEach(Consumer)\u3068\u540c\u3058\u3067\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true  \">List&lt;Integer&gt; list = Arrays.asList(1, 2, 3);\r\nIterator it = list.iterator();\r\nit.forEachRemaining(e -&gt; System.out.println(e)); \/\/ \u2192 1, 2, 3<\/pre>\n<p>Iteartor\u304b\u3089\u306e\u8981\u7d20\u53d6\u5f97\u51e6\u7406\u3092\u66f8\u304b\u306a\u304f\u3066\u3082\u3044\u3044\u306e\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u4e0a\u3067\u306e\u30df\u30b9\u3082\u6e1b\u308b\u3053\u3068\u304c\u671f\u5f85\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u30e1\u30bd\u30c3\u30c9\u540d\u306b<span>&#8220;Remaining&#8221;<\/span>\u3068\u4ed8\u3044\u3066\u3044\u308b\u3053\u3068\u304b\u3089\u3082\u63a8\u6e2c\u3067\u304d\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u901a\u5e38\u306e<span>Iterator<\/span>\u3067\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306e\u9014\u4e2d\u304b\u3089\u5b9f\u884c\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;Integer&gt; list = Arrays.asList(1, 2, 3);\r\nIterator it = list.iterator();\r\nSystem.out.println(it.next()); \/\/ \u2192 1\r\nit.forEachRemaining(e -&gt; System.out.println(e)); \/\/ \u2192 2, 3<\/pre>\n<h2><span id=\"Javaforeach-2\">\uff14\uff0e\u3010Java\u3011\u518d\u5e30\u547c\u3073\u51fa\u3057\u306b\u3088\u308b<span>foreach<\/span><\/span><\/h2>\n<p>\u6700\u5f8c\u306b\u3001\u7e70\u308a\u8fd4\u3057\u69cb\u6587\u30fb<span>Iterator<\/span>\u30fb<span>Stream API<\/span>\u3092\u4f7f\u308f\u306a\u3044<span>foreach<\/span>\u306e\u3084\u308a\u65b9\u3092\u7d39\u4ecb\u3057\u307e\u3059<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.Arrays;\r\nimport java.util.List;\r\nimport java.util.function.Consumer;\r\n\r\nclass RecursiveCallForeach {\r\n\t&lt;T&gt; void foreach(List&lt;T&gt; list, Consumer&lt;T&gt; c) {\r\n\t\tif (list.isEmpty()) {\r\n\t\t\treturn;\r\n\t\t}\r\n\t\tc.accept(list.get(0));\r\n\t\tforeach(list.subList(1, list.size()), c);\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tRecursiveCallForeach rcf = new RecursiveCallForeach();\r\n\t\tList&lt;Integer&gt; list = Arrays.asList(1, 2, 3);\r\n\t\trcf.foreach(list, e -&gt; System.out.println(e));\r\n\t}\r\n}<\/pre>\n<p>\u30e1\u30bd\u30c3\u30c9<span>foreach<\/span>\u3067\u306f\u5e38\u306b<span>List<\/span>\u306e\u5148\u982d\u8981\u7d20\u306b\u3060\u3051\u4f55\u304b\u306e\u51e6\u7406\u3092\u884c\u3044\u3001<span>List<\/span>\u306e\u6b8b\u308a\u90e8\u5206\u304b\u3089\u65b0\u3057\u3044<span>List<\/span>\u3092\u751f\u6210\u3057\u3066<span>foreach<\/span>\u3092\u518d\u5ea6\u547c\u3073\u51fa\u3057\u307e\u3059\u3002\u3053\u308c\u3092\u7e70\u308a\u8fd4\u3059\u5185\u306b\u3001\u5f15\u6570\u306e<span>List<\/span>\u306e\u5185\u5bb9\u304c\u306a\u304f\u306a\u3063\u305f\u3089\u51e6\u7406\u7d42\u4e86\u3067\u3059\u3002\u30b9\u30c6\u30c3\u30d7\u3092\u3058\u3063\u304f\u308a\u8ffd\u3044\u306a\u304c\u3089\u8aad\u3093\u3067\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<div class=\"attention a-3\">\n<p class=\"attention-title\" style=\"text-align: left;\">\u5b9f\u884c\u30b9\u30c6\u30c3\u30d7\u306e\u30a4\u30e1\u30fc\u30b8<\/p>\n<p>foreach [1, 2, 3]<\/p>\n<p>\u3000\u2517foreach [2, 3]<\/p>\n<p>\u3000\u3000\u3000\u2517foreach [3]<\/p>\n<p>\u3000\u3000\u3000\u3000\u3000\u2517foreach [] \u2192 return!<\/p>\n<\/div>\n<p>\u3053\u308c\u304c\u3044\u308f\u3086\u308b\u300c\u518d\u5e30\u547c\u3073\u51fa\u3057\u300d\u3067\u3059\u3002\u4e16\u306e\u4e2d\u306f\u5e83\u3044\u3082\u306e\u3067\u3001\u7e70\u308a\u8fd4\u3057\u69cb\u6587\u3092\u6301\u305f\u306a\u3044\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u304c\u6570\u591a\u304f\u5b58\u5728\u3057\u307e\u3059\u3002\u305d\u306e\u4ee3\u8868\u683c\u304c\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3059\u3002\u305d\u306e\u3088\u3046\u306a\u8a00\u8a9e\u3067\u306f\u7e70\u308a\u8fd4\u3057\u3092\u518d\u5e30\u547c\u3073\u51fa\u3057\u3067\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u666e\u901a\u3067\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u305d\u308c\u3092<span>Java<\/span>\u98a8\u306b\u5b9f\u88c5\u3057\u3066\u307f\u305f\u306e\u3067\u3059\u3002<\/p>\n<p>\u30e1\u30ea\u30c3\u30c8\u306f\u30b7\u30f3\u30d7\u30eb\u3055\u3067\u3059\u3002<span>List<\/span>\u3078\u306e\u4e8b\u5b9f\u4e0a\u306e\u64cd\u4f5c\u306f\u5148\u982d\u8981\u7d20\u306e\u53d6\u51fa\u3057\u3068\u5f8c\u7d9a<span>List<\/span>\u306e\u5207\u308a\u51fa\u3057\u3060\u3051\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u30df\u30b9\u306b\u7e4b\u304c\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u64cd\u4f5c<span>(<\/span>\u52a0\u7b97\u30fb\u6e1b\u7b97\u7b49<span>)<\/span>\u3092\u3057\u3066\u3044\u307e\u305b\u3093\u3002\u5f8c\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u5b9f\u884c\u306e\u526f\u4f5c\u7528\u304c\u306a\u3044<span>(<\/span>\u304b\u3082\u3057\u308c\u306a\u3044<span>)<\/span>\u3053\u3068\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u304c\u3001\u8a73\u7d30\u306f\u8ff0\u3079\u307e\u305b\u3093\u306e\u3067\u3001\u8208\u5473\u304c\u3042\u308c\u3070\u8abf\u3079\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001\u518d\u5e30\u547c\u3073\u51fa\u3057\u3068\u306f\u76f4\u63a5\u95a2\u4fc2\u3057\u307e\u305b\u3093\u304c\u3001\u5b9f\u884c\u3057\u305f\u3044\u51e6\u7406\u3092\u30e1\u30bd\u30c3\u30c9\u5185\u306b\u8a18\u8ff0\u3057\u3066\u3044\u306a\u3044\u306e\u3082\u30dd\u30a4\u30f3\u30c8\u3067\u3059\u3002\u51e6\u7406\u81ea\u4f53\u306f<span>Consumer<\/span>\u306a\u306e\u3067\u3044\u304f\u3089\u3067\u3082\u5dee\u3057\u66ff\u3048\u304c\u52b9\u304d\u307e\u3059\u3002\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u306f\u300c\u51e6\u7406\u300d\u3092\u95a2\u6570\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u8868\u73fe\u3057\u3001\u81ea\u7531\u306b\u5dee\u3057\u66ff\u3048\u3089\u308c\u307e\u3059\u3002<span>Java<\/span>\u3082\u305d\u306e\u5883\u5730\u306b\u4e00\u6b69\u8fd1\u4ed8\u3044\u305f\u306e\u3067\u3059\u3002<\/p>\n<p>\u30c7\u30e1\u30ea\u30c3\u30c8\u306f\u5206\u304b\u308a\u3065\u3089\u3055\u3067\u3059\u3002<span>Java<\/span>\u3067\u306f\u518d\u5e30\u3092\u3042\u307e\u308a\u4f7f\u308f\u306a\u3044\u4eba\u3082\u3044\u308b\u3067\u3057\u3087\u3046\u304b\u3089\u3001\u9762\u55b0\u3089\u3063\u305f\u65b9\u3082\u591a\u3044\u3067\u3057\u3087\u3046\u3002\u305d\u308c\u306b\u3001\u666e\u901a\u306e\u30eb\u30fc\u30d7\u69cb\u6587\u306b\u6bd4\u3079\u308c\u3070\u30e1\u30e2\u30ea\u3082\u4f7f\u3044\u307e\u3059\u3002<span>foreach<\/span>\u3092\u518d\u5ea6\u547c\u3073\u51fa\u3059\u5ea6\u306b\u3001<span>List<\/span>\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u65b0\u3057\u304f\u751f\u6210\u3059\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<h2><span id=\"i-2\">\uff15\uff0e\u307e\u3068\u3081<\/span><\/h2>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f<span>Java<\/span>\u3067\u306e<span>foreach<\/span>\u6587\u306b\u3064\u3044\u3066\u6982\u89b3\u3057\u307e\u3057\u305f\u3002<span>foreach<\/span>\u306e\u3084\u308a\u65b9\u306f\u3001<span>Java<\/span>\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3068\u3057\u3066\u306e\u69cb\u6587\u3084\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u6a5f\u80fd\u3001\u518d\u5e30\u547c\u3073\u51fa\u3057\u306a\u3069\u8272\u3005\u3068\u3042\u308a\u307e\u3059\u3057\u3001\u305d\u308c\u305e\u308c\u306b\u9577\u77ed\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u306b\u3001\u3053\u306e\u8a18\u4e8b\u3067\u306f\u7d39\u4ecb\u3057\u307e\u305b\u3093\u3067\u3057\u305f\u304c\u3001<span>Java<\/span>\u306e\u6a19\u6e96<span>API<\/span>\u306b\u306f\u69d8\u3005\u306a<span>foreach<\/span>\u7684\u306b\u4f7f\u3048\u308b\u30af\u30e9\u30b9\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u63a2\u7d22\u3092<span>foreach<\/span>\u7684\u306b\u3067\u304d\u308b<span>FileVisitor<\/span>\u3084<span>Files.walk()<\/span>\u306a\u3069\u3067\u3059\u3002\u3053\u3046\u3067\u304d\u305f\u3089\u3044\u3044\u306a\u3001\u3068\u3044\u3046\u6a5f\u80fd\u306f\u3082\u3046\u6a19\u6e96<span>API<\/span>\u5185\u306b\u65e2\u306b\u3042\u3063\u305f\u308a\u3057\u307e\u3059\u306e\u3067\u3001\u8abf\u3079\u3066\u307f\u3066\u3082\u9762\u767d\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>foreach\u7684\u306a\u51e6\u7406\u3092\u3059\u308b\u6642\u306b\u3001\u7528\u9014\u306b\u5fdc\u3058\u305f\u3082\u306e\u3092\u81ea\u5728\u306b\u9078\u3079\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3001\u697d\u3057\u304f\u52b9\u7387\u7684\u306b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u3087\u3046<span>!!<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u4e0a\u3067\u30e2\u30ce\u306e\u96c6\u307e\u308a(\u914d\u5217\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u7b49)\u306e\u5404\u8981\u7d20\u3078\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u884c\u3046\u69cb\u6587\u3084\u6a5f\u80fd\u3092\u3001\u4e00\u822c\u306bforeach\u6587\u3068\u8a00\u3044\u307e\u3059\u3002 Java\u3067foreach\u6587\u306b\u76f4\u63a5\u5bfe\u5fdc\u3059\u308b\u3082\u306e\u306f\u62e1\u5f35for\u6587\u3067\u3059\u3002 \u305f\u3060\u3001foreach\u6587\u3092\u300c [&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\/858"}],"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=858"}],"version-history":[{"count":10,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/858\/revisions"}],"predecessor-version":[{"id":5685,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/858\/revisions\/5685"}],"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=858"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/categories?post=858"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}