{"id":9266,"date":"2024-03-15T02:36:52","date_gmt":"2024-03-14T17:36:52","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aecomparator%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%bc%e3%83%95%e3%82%a7%e3%83%bc%e3%82%b9%e3%81%ae%e8%a8%ad%e5%ae%9a%e6%96%b9%e6%b3%95%e3%81%af%e3%81%a9%e3%81%86%e3%81%99%e3%82%8b%e3%81%ae\/"},"modified":"2025-08-04T00:47:20","modified_gmt":"2025-08-03T15:47:20","slug":"java%e3%81%aecomparator%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%bc%e3%83%95%e3%82%a7%e3%83%bc%e3%82%b9%e3%81%ae%e8%a8%ad%e5%ae%9a%e6%96%b9%e6%b3%95%e3%81%af%e3%81%a9%e3%81%86%e3%81%99%e3%82%8b%e3%81%ae","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aecomparator%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%bc%e3%83%95%e3%82%a7%e3%83%bc%e3%82%b9%e3%81%ae%e8%a8%ad%e5%ae%9a%e6%96%b9%e6%b3%95%e3%81%af%e3%81%a9%e3%81%86%e3%81%99%e3%82%8b%e3%81%ae\/","title":{"rendered":"Java Comparator\u5fb9\u5e95\u89e3\u8aac\uff1a\u8a2d\u5b9a\u65b9\u6cd5\u3068\u5b9f\u88c5\u4f8b"},"content":{"rendered":"<p>Comparator\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30bd\u30fc\u30c8\u30eb\u30fc\u30eb\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3059\u3002\u3053\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u306f\u30012\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306ecompare(Object o1, Object o2)\u30e1\u30bd\u30c3\u30c9\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>Comparator\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u306b\u306f\u3001\u901a\u5e38\u3001Comparator\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u3001\u305d\u306e\u30af\u30e9\u30b9\u5185\u3067compare\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyComparator<\/span> <span class=\"hljs-keyword\">implements<\/span> <span class=\"hljs-title class_\">Comparator<\/span>&lt;Integer&gt; {\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">compare<\/span><span class=\"hljs-params\">(Integer o1, Integer o2)<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u5b9e\u73b0\u6bd4\u8f83\u903b\u8f91\uff0c\u6bd4\u5982\u6309\u7167\u6570\u5b57\u5927\u5c0f\u5347\u5e8f\u6392\u5e8f<\/span>\r\n        <span class=\"hljs-keyword\">return<\/span> o1.compareTo(o2);\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u305d\u306e\u5f8c\u3001\u3053\u306eComparator\u3092\u4f7f\u7528\u3057\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4e26\u3079\u66ff\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001<\/p>\n<pre class=\"post-pre\"><code>List&lt;Integer&gt; list = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ArrayList<\/span>&lt;&gt;();\r\nlist.add(<span class=\"hljs-number\">3<\/span>);\r\nlist.add(<span class=\"hljs-number\">1<\/span>);\r\nlist.add(<span class=\"hljs-number\">2<\/span>);\r\n\r\n<span class=\"hljs-type\">MyComparator<\/span> <span class=\"hljs-variable\">myComparator<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">MyComparator<\/span>();\r\nCollections.sort(list, myComparator);\r\n\r\nSystem.out.println(list); <span class=\"hljs-comment\">\/\/ \u8f93\u51fa[1, 2, 3]<\/span>\r\n<\/code><\/pre>\n<p>Comparator\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u30af\u30e9\u30b9\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b\u3053\u3068\u4ee5\u5916\u306b\u3082\u3001\u533f\u540d\u30af\u30e9\u30b9\u3084Lambda\u5f0f\u3092\u4f7f\u7528\u3057\u3066Comparator\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001<\/p>\n<pre class=\"post-pre\"><code>List&lt;Integer&gt; list = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ArrayList<\/span>&lt;&gt;();\r\nlist.add(<span class=\"hljs-number\">3<\/span>);\r\nlist.add(<span class=\"hljs-number\">1<\/span>);\r\nlist.add(<span class=\"hljs-number\">2<\/span>);\r\n\r\n<span class=\"hljs-comment\">\/\/ \u4f7f\u7528\u533f\u540d\u7c7b<\/span>\r\nCollections.sort(list, <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Comparator<\/span>&lt;Integer&gt;() {\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">compare<\/span><span class=\"hljs-params\">(Integer o1, Integer o2)<\/span> {\r\n        <span class=\"hljs-keyword\">return<\/span> o1.compareTo(o2);\r\n    }\r\n});\r\n\r\n<span class=\"hljs-comment\">\/\/ \u4f7f\u7528Lambda\u8868\u8fbe\u5f0f<\/span>\r\nCollections.sort(list, (o1, o2) -&gt; o1.compareTo(o2));\r\n\r\nSystem.out.println(list); <span class=\"hljs-comment\">\/\/ \u8f93\u51fa[1, 2, 3]<\/span>\r\n<\/code><\/pre>\n<p>\u7dcf\u3058\u3066\u3001Comparator\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u8a2d\u5b9a\u3059\u308b\u65b9\u6cd5\u306b\u306f\u69d8\u3005\u306a\u3082\u306e\u304c\u3042\u308a\u3001\u5177\u4f53\u7684\u306a\u30cb\u30fc\u30ba\u306b\u5408\u308f\u305b\u305f\u65b9\u6cd5\u3092\u9078\u629e\u3057\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30bd\u30fc\u30c8\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Comparator\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30bd\u30fc\u30c8\u30eb\u30fc\u30eb\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306e\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3059\u3002\u3053\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u306f\u30012\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306ecompare(Object o1, Object [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[890,42,367,91,18],"class_list":["post-9266","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-comparator","tag-java","tag-367","tag-91","tag-18"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java Comparator\u5fb9\u5e95\u89e3\u8aac\uff1a\u8a2d\u5b9a\u65b9\u6cd5\u3068\u5b9f\u88c5\u4f8b - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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