{"id":131644,"date":"2024-03-25T19:55:03","date_gmt":"2024-03-25T10:55:03","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8bequals%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95\/"},"modified":"2024-03-28T07:02:19","modified_gmt":"2024-03-27T22:02:19","slug":"java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8bequals%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8bequals%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java\u306b\u304a\u3051\u308bequals\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u65b9\u6cd5"},"content":{"rendered":"<p>Java\u306b\u304a\u3044\u3066\u3001equals()\u30e1\u30bd\u30c3\u30c9\u306f2\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002equals()\u30e1\u30bd\u30c3\u30c9\u306fJava\u306eObject\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308a\u3001\u3059\u3079\u3066\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306fObject\u30af\u30e9\u30b9\u304b\u3089\u7d99\u627f\u3055\u308c\u308b\u305f\u3081\u3001\u3059\u3079\u3066\u306e\u30af\u30e9\u30b9\u306fequals()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u901a\u5e38\u3001equals()\u30e1\u30bd\u30c3\u30c9\u306f2\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u53c2\u7167\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002\u3064\u307e\u308a\u30012\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u540c\u3058\u30e1\u30e2\u30ea\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3057\u307e\u3059\u30022\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u53c2\u7167\u304c\u7b49\u3057\u3051\u308c\u3070true\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u3001false\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u3060\u304c\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u53c2\u7167\u81ea\u4f53\u3067\u306f\u306a\u304f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5185\u5bb9\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002\u305d\u306e\u305f\u3081\u306b\u306f\u3001equals()\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n<p>Equals()\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u4e00\u822c\u7684\u306a\u624b\u9806\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ol>\n<li>@Override\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3001\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u304c\u89aa\u30af\u30e9\u30b9\u306eequals()\u30e1\u30bd\u30c3\u30c9\u3092\u6b63\u3057\u304f\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n<li>\u6e21\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u3067\u3042\u308b\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u3082\u3057null\u306a\u3089false\u3092\u8fd4\u3059\u3002<\/li>\n<li>\u6e21\u3057\u5024\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u540c\u3058\u578b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u7570\u306a\u308b\u578b\u3067\u3042\u308c\u3070False\u3092\u8fd4\u3059<\/li>\n<li>\u53d7\u4fe1\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u73fe\u5728\u306e\u578b\u306b\u5909\u63db\u3057\u307e\u3059\u3002<\/li>\n<li>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u6e21\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3057\u3001\u3059\u3079\u3066\u4e00\u81f4\u3059\u308c\u3070true\u3092\u8fd4\u3057\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306ffalse\u3092\u8fd4\u3059\u3002<\/li>\n<\/ol>\n<p>\u6b21\u306b\u3001equals() \u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u65b9\u6cd5\u306e\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Person<\/span> {\r\n<span class=\"hljs-keyword\">private<\/span> String name;\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-type\">int<\/span> age;\r\n<span class=\"hljs-comment\">\/\/ \u6784\u9020\u65b9\u6cd5\u548c\u5176\u4ed6\u65b9\u6cd5\u7701\u7565<\/span>\r\n<span class=\"hljs-meta\">@Override<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-type\">boolean<\/span> <span class=\"hljs-title function_\">equals<\/span><span class=\"hljs-params\">(Object obj)<\/span> {\r\n<span class=\"hljs-keyword\">if<\/span> (<span class=\"hljs-built_in\">this<\/span> == obj) {\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">true<\/span>;\r\n}\r\n<span class=\"hljs-keyword\">if<\/span> (obj == <span class=\"hljs-literal\">null<\/span> || getClass() != obj.getClass()) {\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">false<\/span>;\r\n}\r\n<span class=\"hljs-type\">Person<\/span> <span class=\"hljs-variable\">person<\/span> <span class=\"hljs-operator\">=<\/span> (Person) obj;\r\n<span class=\"hljs-keyword\">return<\/span> age == person.age &amp;&amp; Objects.equals(name, person.name);\r\n}\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001Person\u30af\u30e9\u30b9\u306eequals()\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305a\u3001\u6e21\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u6b21\u306b\u6e21\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cPerson\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002\u6b21\u306b\u3001\u6e21\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092Person\u578b\u306b\u5909\u63db\u3057\u3001name\u3068age\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001\u3059\u3079\u3066\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u7b49\u3057\u3044\u5834\u5408\u306ftrue\u3092\u8fd4\u3057\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306ffalse\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>equals()\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u3053\u3068\u3067Person\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u7b49\u4fa1\u6027\u3092\u5224\u5b9a\u3059\u308bequals()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">Person<\/span> <span class=\"hljs-variable\">person1<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Person<\/span>(<span class=\"hljs-string\">\"Alice\"<\/span>, <span class=\"hljs-number\">25<\/span>);\r\n<span class=\"hljs-type\">Person<\/span> <span class=\"hljs-variable\">person2<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Person<\/span>(<span class=\"hljs-string\">\"Alice\"<\/span>, <span class=\"hljs-number\">25<\/span>);\r\n<span class=\"hljs-type\">Person<\/span> <span class=\"hljs-variable\">person3<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Person<\/span>(<span class=\"hljs-string\">\"Bob\"<\/span>, <span class=\"hljs-number\">30<\/span>);\r\nSystem.out.println(person1.equals(person2)); <span class=\"hljs-comment\">\/\/ \u8f93\u51fatrue<\/span>\r\nSystem.out.println(person1.equals(person3)); <span class=\"hljs-comment\">\/\/ \u8f93\u51fafalse<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306b\u304a\u3044\u3066\u3001equals()\u30e1\u30bd\u30c3\u30c9\u306f2\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002equals()\u30e1\u30bd\u30c3\u30c9\u306fJava\u306eObject\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308a\u3001\u3059\u3079\u3066\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306fObject\u30af\u30e9\u30b9 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-131644","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"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\u306b\u304a\u3051\u308bequals\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u306b\u304a\u3051\u308bequals\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u65b9\u6cd5\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u306b\u304a\u3051\u308bequals\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"Java\u306b\u304a\u3044\u3066\u3001equals()\u30e1\u30bd\u30c3\u30c9\u306f2\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002equals()\u30e1\u30bd\u30c3\u30c9\u306fJava\u306eObject\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308a\u3001\u3059\u3079\u3066\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306fObject\u30af\u30e9\u30b9 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u306b\u304a\u3051\u308bequals\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u65b9\u6cd5\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-25T10:55:03+00:00\" 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