{"id":1334,"date":"2019-01-28T13:00:20","date_gmt":"2019-01-28T04:00:20","guid":{"rendered":"https:\/\/www.bold.ne.jp\/engineer-club\/?p=1334"},"modified":"2025-10-06T16:50:15","modified_gmt":"2025-10-06T07:50:15","slug":"java-contains","status":"publish","type":"post","link":"https:\/\/www.bold.ne.jp\/engineer-club\/java-contains","title":{"rendered":"Java\u306econtains\u3068\u306f\uff1fcontains\u3067\u300c\u542b\u3080\u300d\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>String\u3001\u914d\u5217\u3001<span>List<\/span>\u3084<span>Set<\/span>\u3001<span>Map<\/span>\u306b\u3001\u6587\u5b57\u5217\u3084\u5024\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u300c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u300d\u306e\u78ba\u8a8d\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u983b\u7e41\u306b\u884c\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001\u5fc5\u8981\u306a\u6642\u306b\u9650\u3063\u3066\u300c\u3048\u30fc\u3063\u3068\u3001\u3069\u3046\u3084\u3063\u3066\u3084\u308b\u3093\u3060\u3063\u3051<span>?<\/span>\u300d\u3068\u306a\u3063\u305f\u308a\u3057\u307e\u305b\u3093\u304b<span>? <\/span>\u3069\u3046\u3057\u3066\u3082\u3001\u3064\u3044\u3064\u3044\u5fd8\u308c\u3066\u3057\u307e\u3046\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u3067\u3082\u3001\u3082\u3046\u5927\u4e08\u592b\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u307f\u3093\u306a\u304c\u3061\u3087\u3063\u3068\u5fd8\u308c\u304c\u3061\u306a\u300c\u4f55\u304b\u304c\u4f55\u304b\u306b\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u306e\u8abf\u3079\u65b9\u300d\u3092\u3001\u5206\u304b\u308a\u3084\u3059\u304f\u304a\u4f1d\u3048\u3057\u307e\u3059<span>!!<\/span><\/p>\n<p>\u203b\u3053\u306e\u8a18\u4e8b\u306e\u30b5\u30f3\u30d7\u30eb\u306f\u3001<span>Java 10<\/span>\u306e\u74b0\u5883\u3067\u52d5\u4f5c\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059<\/p>\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">\u76ee\u6b21<\/p><ul class=\"toc_list\"><li><a href=\"#Javacontains\">\uff11\uff0e\u3010Java\u3011contains\u306f\u300c\u542b\u3093\u3067\u3044\u308b\u304b?\u300d\u306e\u5171\u901a\u30ad\u30fc\u30ef\u30fc\u30c9<\/a><\/li><li><a href=\"#JavaString\">\uff12\uff0e\u3010Java\u3011String\u304c\u542b\u3093\u3067\u3044\u308b\u304b?<\/a><ul><li><a href=\"#-Stringcontains\">\uff12-\uff11\uff0eString.contains\u3067\u63a2\u3059<\/a><\/li><li><a href=\"#-StringindexOf\">\uff12-\uff12\uff0eString.indexOf\u3067\u63a2\u3059<\/a><\/li><li><a href=\"#-Stringmatches\">\uff12-\uff13\uff0eString.matches\u3067\u63a2\u3059<\/a><\/li><\/ul><\/li><li><a href=\"#Java\">\uff13\uff0e\u3010Java\u3011\u914d\u5217\u304c\u542b\u3093\u3067\u3044\u308b\u304b?<\/a><ul><li><a href=\"#-for\">\uff13-\uff11\uff0efor\u6587\u3067\u63a2\u3059<\/a><\/li><li><a href=\"#-ArraysasListList\">\uff13-\uff12\uff0eArrays.asList\u3067List\u306b\u5909\u63db\u3057\u3066\u63a2\u3059<\/a><\/li><\/ul><\/li><li><a href=\"#JavaCollectionListSetQueueStack\">\uff14\uff0e\u3010Java\u3011Collection(List\/Set\/Queue\/Stack)\u304c\u542b\u3093\u3067\u3044\u308b\u304b?<\/a><ul><li><a href=\"#-Collectioncontains\">\uff14-\uff11\uff0eCollection.contains\u3067\u63a2\u3059<\/a><\/li><li><a href=\"#-CollectioncontainsAll\">\uff14-\uff12\uff0eCollection.containsAll\u3067\u63a2\u3059<\/a><\/li><\/ul><\/li><li><a href=\"#JavaMap\">\uff15\uff0e\u3010Java\u3011Map\u304c\u542b\u3093\u3067\u3044\u308b\u304b?<\/a><ul><li><a href=\"#-MapcontainsKey\">\uff15-\uff11\uff0eMap.containsKey\u3067\u30ad\u30fc\u3092\u63a2\u3059<\/a><\/li><li><a href=\"#-MapcontainsValue\">\uff15-\uff12\uff0eMap.containsValue\u3067\u5024\u3092\u63a2\u3059<\/a><\/li><li><a href=\"#-Map\">\uff15-\uff13\uff0eMap\u306e\u30ad\u30fc\u304b\u5024\u306b\u8907\u6570\u306e\u5024\u3092\u542b\u3093\u3067\u3044\u308b\u304b\u4e00\u5ea6\u306b\u63a2\u3059<\/a><\/li><\/ul><\/li><li><a href=\"#i\">\uff16\uff0e\u3010\u5fdc\u7528\u3011\u4fbf\u5229\u30fb\u9ad8\u901f\u306a\u691c\u7d22\u306e\u4ed5\u65b9<\/a><ul><li><a href=\"#i-2\">\uff16-\uff11\uff0e\u6587\u5b57\u5217\u3092\u6b63\u898f\u8868\u73fe\u3067\u63a2\u3059<\/a><\/li><li><a href=\"#-CollectionStream\">\uff16-\uff12\uff0e\u914d\u5217\u30fbCollection\u304b\u3089Stream\u3067\u63a2\u3059<\/a><\/li><li><a href=\"#-ArraysbinarySearch\">\uff16-\uff13\uff0eArrays.binarySearch\u3067\u9ad8\u901f\u306b\u63a2\u3059<\/a><\/li><li><a href=\"#-CollectionsbinarySearch\">\uff16-\uff14\uff0eCollections.binarySearch\u3067\u9ad8\u901f\u306b\u63a2\u3059<\/a><\/li><\/ul><\/li><li><a href=\"#i-3\">\uff17\uff0e\u307e\u3068\u3081<\/a><\/li><\/ul><\/div>\n<h2><span id=\"Javacontains\">\uff11\uff0e\u3010Java\u3011contains\u306f\u300c\u542b\u3093\u3067\u3044\u308b\u304b<span>?<\/span>\u300d\u306e\u5171\u901a\u30ad\u30fc\u30ef\u30fc\u30c9<\/span><\/h2>\n<p>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u306f\u3001\u4f55\u304b\u304c\u4f55\u304b\u3092\u542b\u3093\u3067\u3044\u308b\u304b<span>\u2026<\/span>\u306e\u78ba\u8a8d\u3092\u826f\u304f\u884c\u3044\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u6587\u5b57\u5217\u306b<span>&#8220;ERROR&#8221;<\/span>\u304c\u542b\u307e\u308c\u3066\u3044\u308c\u3070\u30a8\u30e9\u30fc\u51e6\u7406\u3092\u3059\u308b\u3001\u6570\u5024\u306e\u914d\u5217\u304c\u7570\u5e38\u5024\u3092\u542b\u3093\u3067\u3044\u308c\u3070\u30a8\u30e9\u30fc\u3068\u3059\u308b\u3001\u306a\u3069\u3067\u3059\u3002<\/p>\n<p>Java\u3067\u300c\u542b\u3093\u3067\u3044\u308b\u304b<span>?<\/span>\u300d\u3092\u77e5\u308b\u6642\u306b\u306f\u3001<span>&#8220;contains&#8221;<\/span>\u3068\u3044\u3046\u5358\u8a9e\u3092\u542b\u3080\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u5224\u65ad\u3057\u307e\u3059\u3002\u5224\u65ad\u7d50\u679c\u306f\u3001<span>true<\/span>\u306a\u3089\u542b\u3093\u3067\u3044\u308b\u3001<span>false<\/span>\u306a\u3089\u542b\u3093\u3067\u3044\u306a\u3044\u3001\u3067\u5171\u901a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u3067\u306f\u3001<span>String<\/span>\u3001\u914d\u5217\u3001<span>List<\/span>\u3084<span>Set<\/span>\u306a\u3069\u306e<span>Collection<\/span>\u3001<span>Map<\/span>\u304c\u4f55\u304b\u3092\u542b\u3093\u3067\u3044\u308b\u304b\u3092\u8abf\u3079\u308b\u65b9\u6cd5\u3092\u304a\u4f1d\u3048\u3057\u307e\u3059\u3002<\/p>\n<h2><span id=\"JavaString\">\uff12\uff0e\u3010Java\u3011String\u304c\u542b\u3093\u3067\u3044\u308b\u304b<span>?<\/span><\/span><\/h2>\n<h3><span id=\"-Stringcontains\">\uff12-\uff11\uff0eString.contains\u3067\u63a2\u3059<\/span><\/h3>\n<p>String.contains\u306f\u3001\u6587\u5b57\u5217\u304c\u5f15\u6570\u306e\u6587\u5b57\u5217\u3092\u542b\u3093\u3067\u3044\u308b\u304b\u78ba\u8a8d\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u542b\u3093\u3067\u3044\u308b\u306a\u3089<span>true<\/span>\u3001\u542b\u3093\u3067\u3044\u306a\u3051\u308c\u3070<span>false<\/span>\u3092\u623b\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public boolean contains(CharSequence s)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\ts - \u691c\u7d22\u3059\u308b\u30b7\u30fc\u30b1\u30f3\u30b9\r\n\u623b\u308a\u5024:\r\n\t\u3053\u306e\u6587\u5b57\u5217\u304cs\u3092\u542b\u3080\u5834\u5408\u306ftrue\u3002\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306ffalse<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">String s = \"ABCD\u3042\u3044\u3046\u3048\u304a\";\r\n\r\nif (s.contains(\"CD\")) {\r\n\tSystem.out.println(\"\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<h3><span id=\"-StringindexOf\">\uff12-\uff12\uff0eString.indexOf\u3067\u63a2\u3059<\/span><\/h3>\n<p>String.contains\u306e\u4ee3\u308f\u308a\u306b\u3001\u6587\u5b57\u5217\u304c\u6700\u521d\u306b\u51fa\u73fe\u3059\u308b\u4f4d\u7f6e\u3092\u623b\u3059<span>indexOf<\/span>\u3067\u63a2\u3057\u3066\u3082\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>indexOf\u306e\u623b\u308a\u5024\u306f\u3001\u6587\u5b57\u5217\u4e2d\u306b\u3001\u63a2\u3057\u3066\u3044\u308b\u6587\u5b57\u5217\u304c\u51fa\u73fe\u3059\u308b\u4f4d\u7f6e\u306e\u6570\u5024\u3067\u3059<span>(0<\/span>\u59cb\u307e\u308a<span>)<\/span>\u3002\u623b\u308a\u5024\u304c<span>-1<\/span>\u3067\u306a\u3051\u308c\u3070\u3001\u63a2\u3057\u3066\u3044\u308b\u6587\u5b57\u5217\u3092\u542b\u3093\u3067\u3044\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public int indexOf(String str)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\tstr - \u691c\u7d22\u5bfe\u8c61\u306e\u90e8\u5206\u6587\u5b57\u5217\u3002\r\n\u623b\u308a\u5024:\r\n\t\u6307\u5b9a\u3055\u308c\u305f\u90e8\u5206\u6587\u5b57\u5217\u304c\u6700\u521d\u306b\u51fa\u73fe\u3059\u308b\u4f4d\u7f6e\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3002\u305d\u306e\u3088\u3046\u306a\u51fa\u73fe\u7b87\u6240\u304c\u306a\u3044\u5834\u5408\u306f-1\u3002<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">String s = \"ABCD\u3042\u3044\u3046\u3048\u304a\";\r\nint index = s.indexOf(\"CD\");\r\n\r\nif (index != -1) {\r\n\tSystem.out.println(\"\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<p>indexOf\u3092\u4f7f\u3046\u3068\u3001\u6587\u5b57\u5217\u3092\u62bd\u51fa<span>(substring)<\/span>\u3057\u305f\u3044\u5834\u5408\u306a\u3069\u306b\u4fbf\u5229\u3067\u3059\u3002\u307e\u305f\u3001<span>indexOf<\/span>\u306b\u306f\u958b\u59cb\u4f4d\u7f6e\u3092\u6307\u5b9a\u3067\u304d\u308b\u3082\u306e\u3084\u3001\u6587\u5b57\u5217\u306e\u5f8c\u308d\u304b\u3089\u63a2\u3059\u3082\u306e\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e<span>indexOf<\/span>\u306f\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u3082\u8a73\u3057\u304f\u8aac\u660e\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n<span style=\"text-decoration:none !important; background-color:#a61e58; color:white; padding:4px 13px; font-size:12px; font-weight:bold; position:relative; top:10px; z-index:1; left:11px;\">\u95a2\u9023\u8a18\u4e8b<\/span>\n<div class=\"blog-card\"><a target=\"_blank\" href=\"https:\/\/www.bold.ne.jp\/engineer-club\/java-indexof\" style=\"text-decoration:none;\">\n    <div class=\"blog-card-thumbnail\"><img src='https:\/\/www.bold.ne.jp\/engineer-club\/wp-content\/uploads\/2018\/10\/shutterstock_568617811-600x366.jpg' alt='Java\u306eindexof\u3068\u306f\uff1f\u6587\u5b57\u30fb\u6587\u5b57\u5217\u306e\u4f4d\u7f6e\u3092\u8abf\u3079\u308bString.indexOf\/lastIndexOf\u306e\u4f7f\u3044\u65b9' width=160 height=98 \/><\/div>\n    <div class=\"blog-card-content\">\n        <div class=\"blog-card-title\">Java\u306eindexof\u3068\u306f\uff1f\u6587\u5b57\u30fb\u6587\u5b57\u5217\u306e\u4f4d\u7f6e\u3092\u8abf\u3079\u308bString.indexOf\/lastIndexOf\u306e\u4f7f\u3044\u65b9 <\/div>\n        <span style=\"font-size: 12px; font-weight: normal; position:relative; color:#666;\"><i class=\"fa fa-clock-o\"><\/i>&nbsp;2025\/09\/17<\/span>\n    <\/div>\n<div class=\"clear\"><\/div>\n<\/a><\/div>\n<h3><span id=\"-Stringmatches\">\uff12-\uff13\uff0eString.matches\u3067\u63a2\u3059<\/span><\/h3>\n<p>String.matches\u3092\u4f7f\u3046\u3068\u300c\u6b63\u898f\u8868\u73fe\u300d\u3067\u306e\u691c\u7d22\u304c\u3067\u304d\u307e\u3059\u3002\u3067\u3059\u306e\u3067\u3001<span>String.matches<\/span>\u306f\u300c\u542b\u3093\u3067\u3044\u308b\u304b\u300d\u306b\u3082\u4f7f\u3048\u305f\u308a\u3057\u307e\u3059\u3002<\/p>\n<p>\u6b63\u898f\u8868\u73fe\u3068\u547c\u3070\u308c\u308b\u6a5f\u80fd\u3092\u4f7f\u3046\u3068\u3001\u6587\u5b57\u5217\u306e\u691c\u7d22\u3092\u52b9\u7387\u5316\u3067\u304d\u307e\u3059\u3002\u6b63\u898f\u8868\u73fe\u306f\u5c11\u3057\u96e3\u3057\u3044\u3067\u3059\u304c\u3001\u4e00\u5ea6\u899a\u3048\u308c\u3070\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u52b9\u7387\u5316\u306b\u629c\u7fa4\u306e\u52b9\u679c\u304c\u3042\u308a\u307e\u3059\u3057\u3001\u4ed6\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3082\u5927\u4f53\u540c\u3058\u3088\u3046\u306b\u4f7f\u3048\u308b\u306e\u3067\u4e00\u77f3\u4e8c\u9ce5\u3067\u3059\u3002<\/p>\n<p>\u305d\u308c\u306b\u3001<span>contains<\/span>\u3084<span>indexOf<\/span>\u306f\u6c7a\u307e\u3063\u305f\u6587\u5b57\u5217\u3057\u304b\u63a2\u305b\u307e\u305b\u3093\u3002\u4f8b\u3048\u3070\u300c<span>&#8220;abc&#8221;<\/span>\u306e\u5f8c\u308d\u306b\u6570\u5b57<span>0<\/span>\uff5e<span>9<\/span>\u306e\u3069\u308c\u304b\u304c\u3042\u308b\u300d\u3068\u3044\u3046\u78ba\u8a8d\u3092\u4e00\u5ea6\u306b\u3067\u304d\u307e\u305b\u3093\u3002\u691c\u7d22\u3057\u305f\u3044\u6587\u5b57\u5217\u3067\u4f55\u5ea6\u3082\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u3092\u7e70\u308a\u8fd4\u3059\u3057\u304b\u306a\u304f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u9577\u304f\u306a\u308a\u304c\u3061\u3067\u3059\u3002\u3067\u3082\u3001\u6b63\u898f\u8868\u73fe\u306a\u3089\u3042\u3063\u3055\u308a\u3068\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public boolean matches(String regex)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\tregex - \u3053\u306e\u6587\u5b57\u5217\u3068\u306e\u4e00\u81f4\u3092\u5224\u5b9a\u3059\u308b\u6b63\u898f\u8868\u73fe\r\n\u623b\u308a\u5024:\r\n\t\u3053\u306e\u6587\u5b57\u5217\u304c\u6307\u5b9a\u3055\u308c\u305f\u6b63\u898f\u8868\u73fe\u3068\u4e00\u81f4\u3059\u308b\u5834\u5408\u306b\u3060\u3051\u3001true\u304c\u8fd4\u3055\u308c\u308b<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">String s = \"ABCD\u3042\u3044\u3046\u3048\u304a\";\r\n\r\n\/\/ \u6587\u5b57\u5217\u5168\u4f53\u306e\u3069\u3053\u304b\u306b\"CD\"\u307e\u305f\u306f\"\u3046\u3048\"\u306e\u3069\u3061\u3089\u304c\u304c\u542b\u307e\u308c\u3066\u3044\u308c\u3070true\r\nif (s.matches(\".*(CD|\u3046\u3048).*\")) {\r\n\tSystem.out.println(\"\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}\r\n\r\n\/\/ .*\u3092\u524d\u5f8c\u306b\u5165\u308c\u306a\u3044\u3068\u30de\u30c3\u30c1\u3057\u306a\u3044\u3002\r\n\/\/ \u4ee5\u4e0b\u3067\u306f\u3001\u6587\u5b57\u5217\u5168\u4f53\u304c\"CD\"\u304b\"\u3046\u3048\"\u306e\u6642\u306b\u3060\u3051\u30de\u30c3\u30c1\u3059\u308b\u305f\u3081\u3002\r\nif (s.matches(\"(CD|\u3046\u3048)\")) {\r\n\tSystem.out.println(\"\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<p>\u8981\u6ce8\u610f\u306a\u306e\u306f\u3001\u300c\u542b\u3093\u3067\u3044\u308b\u304b\u300d\u3068\u3059\u308b\u306a\u3089\u3001\u6b63\u898f\u8868\u73fe\u306e\u6700\u521d\u3068\u6700\u5f8c\u306b<span>&#8220;.*&#8221;<\/span>\u3092\u4ed8\u3051\u308b\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u3067\u3059\u3002<span>String.matches<\/span>\u306f\u6587\u5b57\u5217\u5168\u4f53\u3068\u30de\u30c3\u30c1\u30f3\u30b0\u3059\u308b\u306e\u3067\u3001\u300c\u6587\u5b57\u5217\u5168\u4f53\u306e\u3069\u3053\u304b\u306b\u3042\u308b\u300d\u3068\u3044\u3046\u610f\u5473\u306b\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u3060\u3068\u5c11\u3057\u4e0d\u4fbf\u306a\u306e\u3067\u3001\u30b7\u30f3\u30d7\u30eb\u306b\u300c\u542b\u3093\u3067\u3044\u308b\u300d\u3092\u78ba\u8a8d\u3057\u305f\u3044\u306a\u3089\u3001<span>Java<\/span>\u306e\u6b63\u898f\u8868\u73fe\u306b\u95a2\u3059\u308b\u30af\u30e9\u30b9<span>(Pattern<\/span>\u3001<span>Matcher)<\/span>\u306e\u4f7f\u3044\u65b9\u3092\u899a\u3048\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u306b\u3064\u3044\u3066\u306f\u5f8c\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<h2><span id=\"Java\">\uff13\uff0e\u3010Java\u3011\u914d\u5217\u304c\u542b\u3093\u3067\u3044\u308b\u304b<span>?<\/span><\/span><\/h2>\n<h3><span id=\"-for\">\uff13-\uff11\uff0efor\u6587\u3067\u63a2\u3059<\/span><\/h3>\n<p>\u6700\u3082\u57fa\u672c\u7684\u306a\u3084\u308a\u65b9\u3067\u3001\u914d\u5217\u5168\u4f53\u3092\u30eb\u30fc\u30d7\u3057\u3066\u5024\u3092\u63a2\u3057\u307e\u3059\u3002\u6bd4\u8f03\u3059\u308b\u6761\u4ef6\u306f\u81ea\u5206\u3067\u66f8\u304f\u306e\u3067\u3001\u7b49\u3057\u3044\u3001\u4ee5\u4e0a\u3001\u4ee5\u4e0b\u3001\u696d\u52d9\u30ed\u30b8\u30c3\u30af\u306b\u5247\u3063\u305f\u5024\u3001\u3044\u308d\u3044\u308d\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String[] arr = {\"AB\", \"CD\", \"EF\", \"GH\"};\r\nboolean contains = false;\r\n\r\nfor (String s : arr) {\r\n\tif (s.equals(\"CD\")) {\r\n\t\tcontains = true;\r\n\t\tbreak;\r\n\t}\r\n}\r\n\r\nif (contains) {\r\n\tSystem.out.println(\"\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<p>\u3068\u3066\u3082\u304a\u624b\u8efd\u3067\u3059\u304c\u3001\u914d\u5217\u306e\u8981\u7d20\u304c\u591a\u304f\u306a\u308c\u3070\u306a\u308b\u307b\u3069\u3001\u78ba\u8a8d\u306b\u6642\u9593\u304c\u304b\u304b\u308a\u307e\u3059\u3002\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u3001\u5f8c\u308d\u304b\u3089\u63a2\u3057\u305f\u308a\u3001\u9014\u4e2d\u304b\u3089\u63a2\u3057\u305f\u308a\u3059\u308b\u306a\u3069\u306e\u5de5\u592b\u304c\u5fc5\u8981\u306b\u306a\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<h3><span id=\"-ArraysasListList\">\uff13-\uff12\uff0eArrays.asList\u3067<span>List<\/span>\u306b\u5909\u63db\u3057\u3066\u63a2\u3059<\/span><\/h3>\n<p>\u3082\u3063\u3068\u30b7\u30f3\u30d7\u30eb\u306b\u3001\u914d\u5217\u304c\u7279\u5b9a\u306e\u5024\u3084\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3068\u7b49\u3057\u3044\u3082\u306e\u3092\u6301\u3064\u304b\u78ba\u8a8d\u3059\u308b\u3060\u3051\u3067\u3044\u3044\u306a\u3089\u3001<span>List.contains<\/span>\u3092\u4f7f\u3063\u3066\u3082\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>List.contains\u3092\u4f7f\u3046\u3068\u3001<span>List<\/span>\u4e2d\u306b\u300c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u300d\u306e\u78ba\u8a8d\u304c\u3067\u304d\u307e\u3059\u3002\u3067\u3059\u306e\u3067\u3001<span>Arrays.asList<\/span>\u3067\u914d\u5217\u304b\u3089<span>List<\/span>\u3092\u4f5c\u308c\u3070\u3001\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u306e\u78ba\u8a8d\u304c\u7c21\u5358\u306b\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">boolean contains(Object o)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\to - \u3053\u306e\u30ea\u30b9\u30c8\u5185\u306b\u3042\u308b\u304b\u3069\u3046\u304b\u304c\u5224\u5b9a\u3055\u308c\u308b\u8981\u7d20\r\n\u623b\u308a\u5024:\r\n\t\u6307\u5b9a\u3055\u308c\u305f\u8981\u7d20\u304c\u3053\u306e\u30ea\u30b9\u30c8\u5185\u306b\u3042\u308b\u5834\u5408\u306ftrue<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">String[] arr = {\"AB\", \"CD\", \"EF\", \"GH\"};\r\nList&lt;String&gt; l = Arrays.asList(arr);\r\n\r\nif (l.contains(\"CD\")) {\r\n\tSystem.out.println(\"\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<p>\u306a\u304a\u3001<span>List.contains<\/span>\u306f\u3001<span>List<\/span>\u4e0a\u306e\u5404\u8981\u7d20\u3078<span>equals<\/span>\u3092\u547c\u3073\u51fa\u3057\u3066\u3001\u63a2\u3057\u3066\u3044\u308b\u3082\u306e\u3068\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001\u81ea\u5206\u3067\u4f5c\u3063\u305f\u30af\u30e9\u30b9\u306e\u5834\u5408\u306f\u3001<span>equals<\/span>\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u3066\u3044\u306a\u3044\u3068\u3001<span>List.contains<\/span>\u3067\u306e\u5224\u65ad\u304c\u51fa\u6765\u306a\u3044\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u6a19\u6e96<span>API<\/span>\u306b\u3042\u308b\u30af\u30e9\u30b9<span>(String<\/span>\u3001<span>Integer<\/span>\u306a\u3069<span>)<\/span>\u306f\u304d\u3061\u3093\u3068<span>equals<\/span>\u304c\u4f5c\u3089\u308c\u3066\u3044\u308b\u306e\u3067\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h2><span id=\"JavaCollectionListSetQueueStack\">\uff14\uff0e\u3010Java\u3011Collection(List\/Set\/Queue\/Stack)\u304c\u542b\u3093\u3067\u3044\u308b\u304b?<\/span><\/h2>\n<h3><span id=\"-Collectioncontains\">\uff14-\uff11\uff0eCollection.contains\u3067\u63a2\u3059<\/span><\/h3>\n<p>List\/Set\/Queue\/Stack\u306a\u3069\u306eCollection\u306b\u306fcontains\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u3001\u6307\u5b9a\u3055\u308c\u305f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u542b\u3093\u3067\u3044\u308b\u304b\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">boolean contains(Object o)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\to - \u3053\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u5185\u306b\u3042\u308b\u304b\u3069\u3046\u304b\u304c\u5224\u5b9a\u3055\u308c\u308b\u8981\u7d20\r\n\u623b\u308a\u5024:\r\n\t\u6307\u5b9a\u3055\u308c\u305f\u8981\u7d20\u304c\u3053\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u5185\u306b\u3042\u308b\u5834\u5408\u306ftrue<\/pre>\n<p>\u3067\u306f\u3001List\/Set\/Queue\/Stack\u306econtains\u3092\u4f7f\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;String&gt; l = Arrays.asList(\"AB\", \"CD\", \"EF\", \"GH\");\r\nSet&lt;String&gt; s = new HashSet&lt;&gt;(l);\r\nQueue&lt;String&gt; q = new ArrayDeque&lt;&gt;(l);\r\nStack&lt;String&gt; st = new Stack&lt;&gt;();\r\nl.forEach(e -&gt; st.push(e));\r\n\r\nif (l.contains(\"CD\")) {\r\n\tSystem.out.println(\"List\u306b\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}\r\n\r\nif (s.contains(\"CD\")) {\r\n\tSystem.out.println(\"Set\u306b\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}\r\n\r\nif (q.contains(\"CD\")) {\r\n\tSystem.out.println(\"Queue\u306b\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}\r\n\r\nif (st.contains(\"CD\")) {\r\n\tSystem.out.println(\"Stack\u306b\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<h4>\uff14-\uff11-\uff11\uff0e\u5927\u4e8b\u306a\u306e\u306f<span>equals<\/span>\u304c\u3061\u3083\u3093\u3068\u4f5c\u3089\u308c\u3066\u3044\u308b\u304b<\/h4>\n<p>Collection.contains\u3067\u91cd\u8981\u306a\u306e\u306f\u3001<span>Collection<\/span>\u306b\u5165\u308c\u3066\u3042\u308b\u30af\u30e9\u30b9\u3067<span>equals<\/span>\u304c\u3061\u3083\u3093\u3068\u4f5c\u3089\u308c\u3066\u3044\u308b\u304b\u3067\u3059\u3002<\/p>\n<p>Collection\u306e\u4e2d\u306b\u6301\u3063\u3066\u3044\u308b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3068\u3001<span>contains<\/span>\u3067\u6307\u5b9a\u3055\u308c\u305f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u540c\u3058\u304b\u306f<span>Object.equals<\/span>\u306e\u7d50\u679c\u3067\u5224\u5b9a\u3055\u308c\u307e\u3059\u3002\u3067\u3059\u306e\u3067\u3001<span>equals<\/span>\u304c\u3057\u3063\u304b\u308a\u3068\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3055\u308c\u3066\u3044\u306a\u3051\u308c\u3070<span>contains<\/span>\u306f\u52d5\u304d\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.ArrayList;\r\nimport java.util.List;\r\n\r\nclass NotOverrideEquals {\r\n\tint i;\r\n\r\n\tNotOverrideEquals(int i) {\r\n\t\tthis.i = i;\r\n\t}\r\n\r\n\t\/\/ \u3053\u306e\u3088\u3046\u306bequals\u304c\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308c\u3070\u3001\u60f3\u5b9a\u901a\u308a\u306b\u52d5\u304f\r\n\t\/\/ public boolean equals(Object obj) {\r\n\t\/\/\treturn this.i == ((NotOverrideEquals)obj).i;\r\n\t\/\/}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tList&lt;NotOverrideEquals&gt; l = new ArrayList&lt;&gt;();\r\n\t\tl.add(new NotOverrideEquals(1));\r\n\t\tl.add(new NotOverrideEquals(2));\r\n\t\tl.add(new NotOverrideEquals(3));\r\n\r\n\t\t\/\/ equals\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u3066\u3044\u306a\u3044\u306e\u3067\u3001\u300c\u540c\u3058\u300d\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3060\u3068\u5224\u65ad\u3067\u304d\u306a\u3044\r\n\t\tboolean b = l.contains(new NotOverrideEquals(2));\r\n\t\tSystem.out.println(b); \/\/ \u2192 false\r\n\t}\r\n}<\/pre>\n<p>Java\u306e\u6a19\u6e96<span>API<\/span>\u306e\u30af\u30e9\u30b9\u306a\u3089\u5927\u62b5\u306f\u5927\u4e08\u592b\u3067\u3059\u304c\u3001\u81ea\u4f5c\u306e\u30af\u30e9\u30b9\u3092\u4f7f\u3046\u5834\u5408\u306f\u3001\u304d\u3061\u3093\u3068<span>equals<\/span>\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3><span id=\"-CollectioncontainsAll\">\uff14-\uff12\uff0eCollection.containsAll\u3067\u63a2\u3059<\/span><\/h3>\n<p>Collection\u304c\u3001\u8abf\u3079\u305f\u3044\u3059\u3079\u3066\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u542b\u3080\u304b\u78ba\u8a8d\u3057\u305f\u3044\u306a\u3089\u3001\u4e00\u5ea6\u306b\u8abf\u3079\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9<span>containsAll<\/span>\u304c\u4f7f\u3048\u307e\u3059\u3002<span>containsAll<\/span>\u3092\u4f7f\u3048\u3070\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u3088\u308a\u5206\u304b\u308a\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u5168\u3066\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u542b\u3080\u304b\u3001\u30eb\u30fc\u30d7\u3092\u3057\u3066<span>contains<\/span>\u3067\u8abf\u3079\u3066\u3082\u3044\u3044\u306e\u3067\u3059\u304c\u3001\u305d\u306e\u3088\u3046\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u81ea\u5206\u3067\u66f8\u304f\u5fc5\u8981\u306f\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">boolean containsAll(Collection&lt;?&gt; c)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\tc - \u3053\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u308b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\r\n\u623b\u308a\u5024:\r\n\t\u6307\u5b9a\u3055\u308c\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u3059\u3079\u3066\u306e\u8981\u7d20\u304c\u3053\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u5185\u306b\u3042\u308b\u5834\u5408\u306ftrue<\/pre>\n<p>\u8abf\u3079\u305f\u3044\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6301\u3063\u3066\u3044\u308b<span>Collection(List<\/span>\u306a\u3069\u3067<span>OK<\/span>\u3067\u3059<span>)<\/span>\u3092\u4f5c\u308a\u3001<span>containsAll<\/span>\u3092\u547c\u3073\u51fa\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;String&gt; v = Arrays.asList(\"AB\", \"GH\"); \/\/ \u8abf\u3079\u305f\u3044\u5024\r\n\r\nList&lt;String&gt; l = Arrays.asList(\"AB\", \"CD\", \"EF\", \"GH\");\r\nSet&lt;String&gt; s = new HashSet&lt;&gt;(l);\r\nQueue&lt;String&gt; q = new ArrayDeque&lt;&gt;(l);\r\nStack&lt;String&gt; st = new Stack&lt;&gt;();\r\nl.forEach(e -&gt; st.push(e));\r\n\r\nif (l.containsAll(v)) {\r\n\tSystem.out.println(\"List\u306b\u5168\u3066\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}\r\n\r\nif (s.containsAll(v)) {\r\n\tSystem.out.println(\"Set\u306b\u5168\u3066\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}\r\n\r\nif (q.containsAll(v)) {\r\n\tSystem.out.println(\"Queue\u306b\u5168\u3066\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}\r\n\r\nif (st.containsAll(v)) {\r\n\tSystem.out.println(\"Stack\u306b\u5168\u3066\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<h2><span id=\"JavaMap\">\uff15\uff0e\u3010Java\u3011Map\u304c\u542b\u3093\u3067\u3044\u308b\u304b<span>?<\/span><\/span><\/h2>\n<p>Map\u306f\u3001\u30ad\u30fc\u3068\u5024\u3092\u30da\u30a2\u306b\u3057\u3066\u6301\u3064\u3082\u306e\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u5927\u5909\u826f\u304f\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<p>Map\u304c\u4f55\u304b\u3092\u542b\u3080\u304b\u78ba\u8a8d\u3057\u305f\u3044\u6642\u306f\u3001\u30ad\u30fc\u304c\u542b\u3080\u304b\u3001\u5024\u304c\u542b\u3080\u304b\u306e\u4e8c\u3064\u306e\u30d1\u30bf\u30fc\u30f3\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001<span>Map<\/span>\u3092\u4f7f\u3046\u4e0a\u3067\u306e\u524d\u63d0\u6761\u4ef6\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u30ad\u30fc\u3068\u3057\u3066\u306f\u6700\u4f4e\u9650<span>Object.equals<\/span>\u3092\u304d\u3061\u3093\u3068\u5b9f\u88c5\u3057\u3066\u3044\u308b\u30af\u30e9\u30b9\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3082\u306e\u306b\u3088\u3063\u3066\u306f\u3001<span>Object.hashCode<\/span>\u3082\u304d\u3061\u3093\u3068\u5b9f\u88c5\u3057\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059<span>(HashMap<\/span>\u3092\u4f7f\u3046\u5834\u5408\u306a\u3069<span>)<\/span>\u3002<\/p>\n<h3><span id=\"-MapcontainsKey\">\uff15-\uff11\uff0eMap.containsKey\u3067\u30ad\u30fc\u3092\u63a2\u3059<\/span><\/h3>\n<p>Map.containsKey\u3067\u3001<span>Map<\/span>\u306e\u30ad\u30fc\u306b\u305d\u306e\u5024\u3092\u542b\u3093\u3067\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">boolean containsKey(Object key)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\tkey - \u3053\u306e\u30de\u30c3\u30d7\u5185\u306b\u3042\u308b\u304b\u3069\u3046\u304b\u304c\u5224\u5b9a\u3055\u308c\u308b\u30ad\u30fc\r\n\u623b\u308a\u5024:\r\n\t\u6307\u5b9a\u3055\u308c\u305f\u30ad\u30fc\u306e\u30de\u30c3\u30d4\u30f3\u30b0\u304c\u3053\u306e\u30de\u30c3\u30d7\u306b\u542b\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u306ftrue<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">Map&lt;String, String&gt; m = new HashMap&lt;&gt;();\r\nm.put(\"AB\", \"\u3042\");\r\nm.put(\"CD\", \"\u3044\");\r\nm.put(\"EF\", \"\u3046\");\r\nm.put(\"GH\", \"\u3048\");\r\nm.put(\"IJ\", \"\u3042\");\r\n\r\nif (m.containsKey(\"CD\")) {\r\n\tSystem.out.println(\"\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<h3><span id=\"-MapcontainsValue\">\uff15-\uff12\uff0eMap.containsValue\u3067\u5024\u3092\u63a2\u3059<\/span><\/h3>\n<p>Map.containsKey\u3067\u3001<span>Map<\/span>\u306e\u5024\u304c\u305d\u306e\u5024\u3092\u542b\u3093\u3067\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">boolean containsValue(Object value)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\tvalue - \u3053\u306e\u30de\u30c3\u30d7\u306b\u3042\u308b\u304b\u3069\u3046\u304b\u304c\u5224\u5b9a\u3055\u308c\u308b\u5024\r\n\u623b\u308a\u5024:\r\n\t\u3053\u306e\u30de\u30c3\u30d7\u304c1\u3064\u307e\u305f\u306f\u8907\u6570\u306e\u30ad\u30fc\u3092\u6307\u5b9a\u3055\u308c\u305f\u5024\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u3057\u3066\u3044\u308b\u5834\u5408\u306ftrue<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">Map&lt;String, String&gt; m = new HashMap&lt;&gt;();\r\nm.put(\"AB\", \"\u3042\");\r\nm.put(\"CD\", \"\u3044\");\r\nm.put(\"EF\", \"\u3046\");\r\nm.put(\"GH\", \"\u3048\");\r\nm.put(\"IJ\", \"\u3042\");\r\n\r\nif (m.containsValue(\"\u3042\")) {\r\n\tSystem.out.println(\"\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<h3><span id=\"-Map\">\uff15-\uff13\uff0eMap\u306e\u30ad\u30fc\u304b\u5024\u306b\u8907\u6570\u306e\u5024\u3092\u542b\u3093\u3067\u3044\u308b\u304b\u4e00\u5ea6\u306b\u63a2\u3059<\/span><\/h3>\n<p>Map\u306e\u30ad\u30fc\u304b\u5024\u306b\u8907\u6570\u306e\u5024\u304c\u542b\u307e\u308c\u308b\u304b\u4e00\u5ea6\u306b\u63a2\u3057\u305f\u3044\u5834\u5408\u3001\u30ba\u30d0\u30ea\u305d\u306e\u3082\u306e\u306a\u30e1\u30bd\u30c3\u30c9\u306f\u306a\u3044\u306e\u3067\u3001<span>Set<\/span>\u3084<span>List<\/span>\u306b\u5909\u63db\u3057\u3066\u304b\u3089<span>containsAll<\/span>\u3092\u3059\u308b\u306e\u304c\u901f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>Map\u306e\u30ad\u30fc\u3092<span>Set<\/span>\u306b\u3059\u308b\u306b\u306f<span>Map.keySet<\/span>\u3092\u3001\u5024\u3092<span>Collection<\/span>\u306b\u3059\u308b\u306b\u306f<span>Map.values<\/span>\u3092\u4f7f\u3044\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u306e\u7d50\u679c\u306b\u5bfe\u3057\u3066\u3001<span>containsAll<\/span>\u3092\u3057\u3066\u3042\u3052\u308c\u3070\u826f\u3044\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;String&gt; v1 = Arrays.asList(\"CD\", \"GH\");\r\nList&lt;String&gt; v2 = Arrays.asList(\"\u3042\", \"\u3046\");\r\n\r\nMap&lt;String, String&gt; m = new HashMap&lt;&gt;();\r\nm.put(\"AB\", \"\u3042\");\r\nm.put(\"CD\", \"\u3044\");\r\nm.put(\"EF\", \"\u3046\");\r\nm.put(\"GH\", \"\u3048\");\r\nm.put(\"IJ\", \"\u3042\");\r\n\r\nSet&lt;String&gt; keySet = m.keySet();\r\nCollection&lt;String&gt; valueList = m.values();\r\n\r\nif (keySet.containsAll(v1)) {\r\n\tSystem.out.println(\"\u30ad\u30fc\u306b\u5168\u3066\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}\r\n\r\nif (valueList.containsAll(v2)) {\r\n\tSystem.out.println(\"\u5024\u306b\u5168\u3066\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<h2><span id=\"i\">\uff16\uff0e\u3010\u5fdc\u7528\u3011\u4fbf\u5229\u30fb\u9ad8\u901f\u306a\u691c\u7d22\u306e\u4ed5\u65b9<\/span><\/h2>\n<h3><span id=\"i-2\">\uff16-\uff11\uff0e\u6587\u5b57\u5217\u3092\u6b63\u898f\u8868\u73fe\u3067\u63a2\u3059<\/span><\/h3>\n<p>java.util.regex.Matcher\u306e<span>find<\/span>\u3092\u4f7f\u3046\u3068\u3001\u6b63\u898f\u8868\u73fe\u306b\u30de\u30c3\u30c1\u3059\u308b\u6587\u5b57\u5217\u3092\u300c\u542b\u3093\u3067\u3044\u308b\u304b\u300d\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<span>Matcher<\/span>\u306f\u6587\u5b57\u5217\u304c\u6b63\u898f\u8868\u73fe\u306b\u30de\u30c3\u30c1\u3059\u308b\u304b\u8abf\u3079\u308b\u30af\u30e9\u30b9\u3067\u3059\u3002<\/p>\n<p>Matcher\u3092\u4f7f\u3046\u306b\u306f\u3001<span>java.util.regex.Pattern<\/span>\u3068\u7d44\u307f\u5408\u308f\u305b\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3057\u307e\u3059\u3002<span>Pattern<\/span>\u306f\u3001\u3069\u3046\u3044\u3046\u6b63\u898f\u8868\u73fe\u304b\u3092\u8868\u3059\u30af\u30e9\u30b9\u3067\u3059\u3002<\/p>\n<ol>\n<li>java.util.Pattern\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092Pattern.compile\u3067\u4f5c\u308b<\/li>\n<li>\u691c\u7d22\u5143\u306e\u6587\u5b57\u5217\u3092Pattern.matcher\u3067\u6307\u5b9a\u3057\u3066\u3001Matcher\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u308b<\/li>\n<li>\u4f5c\u3063\u305f<span>Matcher<\/span>\u3067<span>find<\/span>\u3084<span>matches<\/span>\u3092\u5b9f\u884c\u3059\u308b<\/li>\n<\/ol>\n<p>\u5c11\u3005\u624b\u9806\u306f\u591a\u3044\u3067\u3059\u304c\u3001\u305d\u306e\u5206<span>Java<\/span>\u3067\u306e\u6b63\u898f\u8868\u73fe\u306e\u30d1\u30ef\u30fc\u3092\u30d5\u30eb\u306b\u4f7f\u3048\u307e\u3059\u3002\u305d\u308c\u306b\u3001<span>Pattern<\/span>\u306f\u4f5c\u3063\u305f\u3082\u306e\u306e\u4f7f\u3044\u307e\u308f\u3057\u304c\u51fa\u6765\u307e\u3059\u306e\u3067\u3001\u8abf\u3079\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u6587\u5b57\u5217\u304c\u305f\u304f\u3055\u3093\u3042\u308b\u5834\u5408\u306b\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String s = \"ABCD\u3042\u3044\u3046\u3048\u304a\";\r\nPattern p = Pattern.compile(\"CD|\u3046\u3048\"); \/\/ \"CD\"\u307e\u305f\u306f\"\u3046\u3048\"\u306e\u3069\u3061\u3089\u304b\r\nMatcher m = p.matcher(s);\r\n\r\n\/\/ \"CD\"\u307e\u305f\u306f\"\u3046\u3048\"\u306e\u3069\u3061\u3089\u304c\u304c\u542b\u307e\u308c\u3066\u3044\u308c\u3070true\r\nif (m.find()) {\r\n\tSystem.out.println(\"\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<p>Java\u3067\u306e\u6b63\u898f\u8868\u73fe\u306e\u4f7f\u3044\u65b9\u3084\u6d3b\u7528\u65b9\u6cd5\u306f\u3001<span>java.util.Pattern<\/span>\u306e<span>Javadoc<\/span>\u3084\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3082\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n<span style=\"text-decoration:none !important; background-color:#a61e58; color:white; padding:4px 13px; font-size:12px; font-weight:bold; position:relative; top:10px; z-index:1; left:11px;\">\u95a2\u9023\u8a18\u4e8b<\/span>\n<div class=\"blog-card\"><a target=\"_blank\" href=\"https:\/\/www.bold.ne.jp\/engineer-club\/java-string-replaceall\" style=\"text-decoration:none;\">\n    <div class=\"blog-card-thumbnail\"><img src='https:\/\/www.bold.ne.jp\/engineer-club\/wp-content\/uploads\/2018\/10\/shutterstock_568617811-600x366.jpg' alt='Java\u306eString.replaceAll\u3068\u306f\uff1f\u30b9\u30de\u30fc\u30c8\u306b\u6587\u5b57\u5217\u7f6e\u63db\u3059\u308b\u305f\u3081\u306ereplaceAll\u306e\u4f7f\u3044\u65b9' width=160 height=98 \/><\/div>\n    <div class=\"blog-card-content\">\n        <div class=\"blog-card-title\">Java\u306eString.replaceAll\u3068\u306f\uff1f\u30b9\u30de\u30fc\u30c8\u306b\u6587\u5b57\u5217\u7f6e\u63db\u3059\u308b\u305f\u3081\u306ereplaceAll\u306e\u4f7f\u3044\u65b9 <\/div>\n        <span style=\"font-size: 12px; font-weight: normal; position:relative; color:#666;\"><i class=\"fa fa-clock-o\"><\/i>&nbsp;2025\/09\/17<\/span>\n    <\/div>\n<div class=\"clear\"><\/div>\n<\/a><\/div>\n<h3><span id=\"-CollectionStream\">\uff16-\uff12\uff0e\u914d\u5217\u30fbCollection\u304b\u3089Stream\u3067\u63a2\u3059<\/span><\/h3>\n<p>Stream\u306e\u7d42\u7aef\u64cd\u4f5canyMatch\u3092\u4f7f\u3046\u3068\u3001Stream\u304c\u6761\u4ef6\u3092\u6e80\u305f\u3059\u3082\u306e\u3092\u542b\u3080\u304b\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002Stream\u306e\u4e2d\u306b\u3001\u5f15\u6570\u306e<span>Predicate.test<\/span>\u304c<span>true<\/span>\u3092\u623b\u3059\u3082\u306e\u304c<span>1<\/span>\u3064\u3067\u3082\u3042\u308b\u5834\u5408\u306f<span>true<\/span>\u304c\u623b\u308a\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u3070<span>false<\/span>\u3067\u3059\u3002<\/p>\n<p>\u4e0b\u8a18\u306f\u30b7\u30f3\u30d7\u30eb\u306a\u4f8b\u306a\u306e\u3067\u3001<span>Collection.contain<\/span>\u3088\u308a\u3082\u9762\u5012\u306b\u601d\u3048\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3067\u3059\u304c\u3001\u8907\u96d1\u306a\u6761\u4ef6\u3067\u306e\u62bd\u51fa\u3092\u3059\u308b\u5834\u5408\u306f\u3001\u3053\u3061\u3089\u306f\u30eb\u30fc\u30d7\u306e\u51e6\u7406\u304c\u3044\u3089\u306a\u3044\u306e\u3067\u6bd4\u8f03\u3059\u308b\u51e6\u7406\u306b\u96c6\u4e2d\u3067\u304d\u307e\u3059\u306d\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String[] arr = {\"AB\", \"CD\", \"EF\", \"GH\"};\r\nboolean b = Arrays.stream(arr).anyMatch(e -&gt; \"CD\".equals(e));\r\nSystem.out.println(b); \/\/ \u2192 true<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;String&gt; l = Arrays.asList(\"AB\", \"CD\", \"EF\", \"GH\");\r\nboolean b = l.stream().anyMatch(e -&gt; \"CD\".equals(e));\r\nSystem.out.println(b); \/\/ \u2192 true<\/pre>\n<p>\u6761\u4ef6\u3092\u6e80\u305f\u3059\u3082\u306e\u304c\u4e00\u3064\u3082\u306a\u3044\u304b\u78ba\u8a8d\u3057\u305f\u3044\u5834\u5408\u306f\u3001<span>noneMatch<\/span>\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String[] arr = {\"AB\", \"CD\", \"EF\", \"GH\"};\r\nboolean b = Arrays.stream(arr).noneMatch(e -&gt; \"XX\".equals(e));\r\nSystem.out.println(b); \/\/ \u2192 true<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;String&gt; l = Arrays.asList(\"AB\", \"CD\", \"EF\", \"GH\");\r\nboolean b = l.stream().noneMatch(e -&gt; \"XX\".equals(e));\r\nSystem.out.println(b); \/\/ \u2192 true<\/pre>\n<h3><span id=\"-ArraysbinarySearch\">\uff16-\uff13\uff0eArrays.binarySearch\u3067\u9ad8\u901f\u306b\u63a2\u3059<\/span><\/h3>\n<p>\u3068\u3066\u3082\u5927\u304d\u306a\u30b5\u30a4\u30ba\u306e\u914d\u5217\u306e\u4e2d\u304b\u3089\u63a2\u3055\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u306a\u3089\u3001<span>java.util.Arrays<\/span>\u306e<span>binarySearch<\/span>\u3092\u6d3b\u7528\u3067\u304d\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u4e8c\u5206\u63a2\u7d22<span>(<\/span>\u30d0\u30a4\u30ca\u30ea\u30b5\u30fc\u30c1<span>)<\/span>\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306b\u3088\u308a\u3001\u9ad8\u901f\u306b\u691c\u7d22\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001\u4ee5\u4e0b\u306e<span>Arrays.binarySearch<\/span>\u3092\u4f7f\u3046\u306b\u306f\u6761\u4ef6\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u914d\u5217\u306e\u8981\u7d20\u304c\u3042\u3089\u304b\u3058\u3081\u30bd\u30fc\u30c8\u3055\u308c\u3066\u3044\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044<\/li>\n<li><span>(Object<\/span>\u7248\u306e\u307f<span>)Comparable<\/span>\u306a\u30af\u30e9\u30b9\u306e\u914d\u5217\u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044<\/li>\n<\/ul>\n<pre class=\"prettyprint lang:default decode:true\">public static int binarySearch(Object[] a, Object key)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\ta - \u691c\u7d22\u3055\u308c\u308b\u914d\u5217\r\n\tkey - \u691c\u7d22\u3055\u308c\u308b\u5024\r\n\u623b\u308a\u5024:\r\n\t\u914d\u5217\u5185\u306b\u691c\u7d22\u30ad\u30fc\u304c\u3042\u308b\u5834\u5408\u306f\u691c\u7d22\u30ad\u30fc\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3002\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306f(-(\u633f\u5165\u30dd\u30a4\u30f3\u30c8) - 1)\u3002 \u633f\u5165\u6642\u70b9\u306f\u3001\u305d\u306e\u30ad\u30fc\u304c\u914d\u5217\u306b\u633f\u5165\u3055\u308c\u308b\u6642\u70b9\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u308b\u3002\u3064\u307e\u308a\u3001\u305d\u306e\u30ad\u30fc\u3088\u308a\u3082\u5927\u304d\u306a\u6700\u521d\u306e\u8981\u7d20\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3002\u914d\u5217\u5185\u306e\u3059\u3079\u3066\u306e\u8981\u7d20\u304c\u6307\u5b9a\u3055\u308c\u305f\u30ad\u30fc\u3088\u308a\u3082\u5c0f\u3055\u3044\u5834\u5408\u306fa.length\u3002 \u3053\u308c\u306b\u3088\u308a\u3001\u30ad\u30fc\u304c\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u306b\u306e\u307f\u623b\u308a\u5024\u304c&gt;= 0\u306b\u306a\u308b\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u308b\u3002<\/pre>\n<p>\u516c\u5f0f<span>Javadoc<\/span>\u306e\u65e5\u672c\u8a9e\u8a33\u306f\u5c11\u3005\u5206\u304b\u308a\u3065\u3089\u3044\u306e\u3067\u3059\u304c\u3001\u79c1\u305f\u3061\u306e\u4f7f\u3044\u65b9\u306a\u3089\u3001\u623b\u308a\u5024\u304c<span>0<\/span>\u4ee5\u4e0a\u306a\u3089\u305d\u306e\u5024\u304c\u914d\u5217\u4e2d\u306b\u3042\u308b\u3001\u3068\u5206\u304b\u3063\u3066\u3044\u308c\u3070\u5341\u5206\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">String[] arr = {\"CD\", \"AB\", \"GH\", \"EF\"};\r\nArrays.sort(arr);\r\n\r\nif (Arrays.binarySearch(arr, \"CD\") &gt;= 0) {\r\n\tSystem.out.println(\"\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<p>\u306a\u304a\u3001<span>Arrays.binarySearch<\/span>\u306b\u306f\u3001<span>Comparator<\/span>\u3092\u4f7f\u3046\u3082\u306e\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u3061\u3089\u306a\u3089\u3001<span>Comparable<\/span>\u306a\u30af\u30e9\u30b9\u3067\u306f\u306a\u3044\u914d\u5217\u3082\u6271\u3048\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3067\u3082\u3001<span>binarySearch<\/span>\u3092\u547c\u3073\u51fa\u3059\u524d\u306b\u30bd\u30fc\u30c8\u304c\u5fc5\u8981\u306a\u306e\u306f\u5909\u308f\u308a\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public static &lt;T&gt; int binarySearch(T[] a, T key, Comparator&lt;? super T&gt; c)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\ta - \u691c\u7d22\u3055\u308c\u308b\u914d\u5217\r\n\tkey - \u691c\u7d22\u3055\u308c\u308b\u5024\r\n\tc - \u914d\u5217\u304c\u9806\u5e8f\u4ed8\u3051\u3055\u308c\u308b\u30b3\u30f3\u30d1\u30ec\u30fc\u30bf\u3002 null\u5024\u306f\u3001\u8981\u7d20\u306e\u81ea\u7136\u9806\u5e8f\u4ed8\u3051\u304c\u4f7f\u7528\u3055\u308c\u308b\u3053\u3068\u3092\u793a\u3059\u3002\r\n\u623b\u308a\u5024:\r\n\t\u203bComparable\u7248\u3068\u540c\u3058\u306a\u306e\u3067\u7701\u7565<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">String[] arr = { \"CD\", \"AB\", \"GH\", \"EF\" };\r\nComparator&lt;String&gt; c = new Comparator&lt;&gt;() {\r\n\tpublic int compare(String str1, String str2) {\r\n\t\treturn str1.compareTo(str2); \/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u540c\u58eb\u306e\u5927\u5c0f\u6bd4\u8f03\u306e\u7d50\u679c\u3092\u623b\u3059\u51e6\u7406\u3092\u81ea\u5206\u3067\u66f8\u304f\r\n\t}\r\n};\r\nArrays.sort(arr, c);\r\n\r\nif (Arrays.binarySearch(arr, \"CD\", c) &gt;= 0) {\r\n\tSystem.out.println(\"\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<p>Arrays.binarySearch\u306b\u306f<span>int<\/span>\u306a\u3069\u306e\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u7248\u3082\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001<span>int<\/span>\u306e\u914d\u5217\u3067\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">int[] arr = {5, 2, 3, 1, 4};\r\nArrays.sort(arr);\r\n\r\nif (Arrays.binarySearch(arr, 3) &gt;= 0) {\r\n\tSystem.out.println(\"\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<p>\u3061\u306a\u307f\u306b\u3001<span>Arrays.binarySearch<\/span>\u306f\u914d\u5217\u5185\u306e\u691c\u7d22\u958b\u59cb\u4f4d\u7f6e\u30fb\u7d42\u4e86\u4f4d\u7f6e\u3092\u6307\u5b9a\u3067\u304d\u308b\u3082\u306e\u3082\u3042\u308a\u307e\u3059\u3002\u5fc5\u8981\u306a\u3089\u3053\u308c\u3089\u3082\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public static int binarySearch(Object[] a, int fromIndex, int toIndex, Object key)\r\npublic static &lt;T&gt; int binarySearch(T[] a, in fromIndex, int toIndex, T key, Comparator&lt;? super T&gt; c)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\tfromIndex - \u691c\u7d22\u3055\u308c\u308b\u6700\u521d\u306e\u8981\u7d20(\u3053\u308c\u3092\u542b\u3080)\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\r\n\ttoIndex - \u691c\u7d22\u3055\u308c\u308b\u6700\u5f8c\u306e\u8981\u7d20(\u3053\u308c\u3092\u542b\u307e\u306a\u3044)\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/pre>\n<h3><span id=\"-CollectionsbinarySearch\">\uff16-\uff14\uff0eCollections.binarySearch\u3067\u9ad8\u901f\u306b\u63a2\u3059<\/span><\/h3>\n<p>\u914d\u5217\u3068\u540c\u3058\u3088\u3046\u306b\u3001\u5024\u3092\u305f\u304f\u3055\u3093\u6301\u3063\u3066\u3044\u308b<span>List<\/span>\u3092<span>contains<\/span>\u3067\u8abf\u3079\u308b\u306e\u306f\u6642\u9593\u304c\u304b\u304b\u308a\u307e\u3059\u3002<span>contains<\/span>\u306f\u5f8b\u5100\u306b\u5148\u982d\u304b\u3089\u5168\u3066\u8abf\u3079\u308b\u304b\u3089\u3067\u3001\u3082\u3057\u5f8c\u308d\u306e\u65b9\u306b\u3042\u3063\u305f\u306a\u3089\u3001\u305d\u308c\u3060\u3051\u6642\u9593\u304c\u7121\u99c4\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u914d\u5217\u306b\u306f\u305d\u306e\u305f\u3081\u306eArrays.binarySearch\u304c\u3042\u308b\u3088\u3046\u306b\u3001List\u306b\u3082Collections.binarySearch\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>Collections.binarySearch\u3092\u4f7f\u3046\u6642\u306e\u30eb\u30fc\u30eb\u3082\u3001Arrays.binarySearch\u3068\u540c\u3058\u3067\u3059\u3002<\/p>\n<ul>\n<li><span>List<\/span>\u306e\u8981\u7d20\u304c\u3042\u3089\u304b\u3058\u3081\u30bd\u30fc\u30c8\u3055\u308c\u3066\u3044\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044<\/li>\n<li><span>Comparable<\/span>\u306a\u30af\u30e9\u30b9\u3092\u683c\u7d0d\u3059\u308b<span>List<\/span>\u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044<\/li>\n<\/ul>\n<pre class=\"prettyprint lang:default decode:true\">public static &lt;T&gt; int binarySearch(List&lt;? extends Comparable&lt;? super T&gt;&gt; list, T key)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\tlist - \u691c\u7d22\u3055\u308c\u308b\u30ea\u30b9\u30c8\u3002\r\n\tkey - \u691c\u7d22\u3055\u308c\u308b\u30ad\u30fc\u3002\r\n\u623b\u308a\u5024:\r\n\t\u30ea\u30b9\u30c8\u5185\u306b\u691c\u7d22\u30ad\u30fc\u304c\u3042\u308b\u5834\u5408\u306f\u691c\u7d22\u30ad\u30fc\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3002\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306f(-(\u633f\u5165\u30dd\u30a4\u30f3\u30c8) - 1)\u3002 \u633f\u5165\u6642\u70b9\u306f\u3001\u305d\u306e\u30ad\u30fc\u304c\u30ea\u30b9\u30c8\u306b\u633f\u5165\u3055\u308c\u308b\u6642\u70b9\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u308b\u3002\u3064\u307e\u308a\u3001\u305d\u306e\u30ad\u30fc\u3088\u308a\u3082\u5927\u304d\u3044\u6700\u521d\u306e\u8981\u7d20\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3002\u30ea\u30b9\u30c8\u5185\u306e\u3059\u3079\u3066\u306e\u8981\u7d20\u304c\u6307\u5b9a\u3055\u308c\u305f\u30ad\u30fc\u3088\u308a\u3082\u5c0f\u3055\u3044\u5834\u5408\u306flist.size()\u3002 \u3053\u308c\u306b\u3088\u308a\u3001\u30ad\u30fc\u304c\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u306b\u306e\u307f\u623b\u308a\u5024\u304c&gt;= 0\u306b\u306a\u308b\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u308b\u3002<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;String&gt; l = Arrays.asList(\"CD\", \"AB\", \"GH\", \"EF\");\r\nCollections.sort(l);\r\n\r\nif (Collections.binarySearch(l, \"CD\") &gt;= 0) {\r\n\tSystem.out.println(\"\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<p>Collections.binarySearch\u306b\u306f\u3001<span>Comparator<\/span>\u3092\u4f7f\u3046\u3082\u306e\u3082\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u3061\u3089\u306e\u5834\u5408\u306f\u3001<span>List<\/span>\u306b\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u30af\u30e9\u30b9\u306f<span>Comparable<\/span>\u3067\u306a\u304f\u3066\u3082\u5927\u4e08\u592b\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public static &lt;T&gt; int binarySearch(List&lt;? extends T&gt; list, T key, Comparator&lt;? super T&gt; c)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\tlist - \u691c\u7d22\u3055\u308c\u308b\u30ea\u30b9\u30c8\u3002\r\n\tkey - \u691c\u7d22\u3055\u308c\u308b\u30ad\u30fc\u3002\r\n\tc - \u30ea\u30b9\u30c8\u304c\u9806\u5e8f\u4ed8\u3051\u3055\u308c\u308b\u30b3\u30f3\u30d1\u30ec\u30fc\u30bf\u3002 null\u5024\u306f\u3001\u8981\u7d20\u306e\u81ea\u7136\u9806\u5e8f\u4ed8\u3051\u304c\u4f7f\u7528\u3055\u308c\u308b\u3053\u3068\u3092\u793a\u3059\u3002\r\n\u623b\u308a\u5024:\r\n\t\u203bComparable\u7248\u3068\u540c\u3058\u306a\u306e\u3067\u7701\u7565<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">List&lt;String&gt; l = Arrays.asList(\"CD\", \"AB\", \"GH\", \"EF\");\r\nComparator&lt;String&gt; c = new Comparator&lt;&gt;() {\r\n\tpublic int compare(String str1, String str2) {\r\n\t\treturn str1.compareTo(str2); \/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u540c\u58eb\u306e\u5927\u5c0f\u6bd4\u8f03\u306e\u7d50\u679c\u3092\u623b\u3059\u51e6\u7406\u3092\u81ea\u5206\u3067\u66f8\u304f\r\n\t}\r\n};\r\nCollections.sort(l, c);\r\n\r\nif (Collections.binarySearch(l, \"CD\", c) &gt;= 0) {\r\n\tSystem.out.println(\"\u542b\u307e\u308c\u3066\u3044\u307e\u3059\");\r\n}<\/pre>\n<h2><span id=\"i-3\">\uff17\uff0e\u307e\u3068\u3081<\/span><\/h2>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<span>String<\/span>\u3001\u914d\u5217\u3001<span>Collection(List\/Set<\/span>\u7b49<span>)<\/span>\u3001<span>Map<\/span>\u306b\u3064\u3044\u3066\u3001\u300c\u542b\u3080\u304b\u3069\u3046\u304b\u300d\u3092\u78ba\u8a8d\u3059\u308b\u65b9\u6cd5\u3092\u304a\u4f1d\u3048\u3057\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n<p>\u57fa\u672c\u7684\u306b\u306f\u3001<span>contains<\/span>\u3068\u3044\u3046\u540d\u524d\u304b\u305d\u308c\u306b\u8fd1\u3044\u540d\u524d\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u3063\u3066\u3001\u305d\u308c\u305e\u308c\u306e\u30af\u30e9\u30b9\u3067\u306e\u78ba\u8a8d\u51e6\u7406\u304c\u884c\u308f\u308c\u308b\u30b1\u30fc\u30b9\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u3053\u306e\u8a18\u4e8b\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001<span>Java<\/span>\u306e\u6a19\u6e96<span>API<\/span>\u3060\u3051\u3092\u7528\u3044\u307e\u3057\u305f\u3002<span>Apache Commons Collections<\/span>\u3084<span>Lang<\/span>\u3001<span>Google<\/span>\u306e<span>Guava<\/span>\u306a\u3069\u306e\u6709\u540d\u306a\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u306f\u3001\u3082\u3063\u3068\u3044\u308d\u3044\u308d\u306a\u3053\u3068\u304c\u7c21\u5358\u306b\u3067\u304d\u307e\u3059\u306e\u3067\u3001\u8208\u5473\u304c\u3042\u308c\u3070\u30c1\u30e3\u30ec\u30f3\u30b8\u3057\u3066\u307f\u307e\u3057\u3087\u3046<span>!<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>String\u3001\u914d\u5217\u3001List\u3084Set\u3001Map\u306b\u3001\u6587\u5b57\u5217\u3084\u5024\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u300c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u300d\u306e\u78ba\u8a8d\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u983b\u7e41\u306b\u884c\u3044\u307e\u3059\u3002 \u305d\u3057\u3066\u3001\u5fc5\u8981\u306a\u6642\u306b\u9650\u3063\u3066\u300c\u3048\u30fc\u3063\u3068\u3001\u3069\u3046\u3084\u3063\u3066\u3084\u308b\u3093\u3060\u3063\u3051?\u300d\u3068\u306a\u3063\u305f\u308a\u3057\u307e\u305b\u3093\u304b?  [&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\/1334"}],"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=1334"}],"version-history":[{"count":10,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/1334\/revisions"}],"predecessor-version":[{"id":5763,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/1334\/revisions\/5763"}],"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=1334"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/categories?post=1334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}