{"id":83319,"date":"2024-03-21T02:42:18","date_gmt":"2024-03-20T17:42:18","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aeequals%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%82%92%e4%bd%bf%e3%81%86%e3%81%ab%e3%81%af%e3%80%81%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e3%81%99%e3%82%8c%e3%81%b0%e3%81%84%e3%81%84\/"},"modified":"2024-04-04T04:03:39","modified_gmt":"2024-04-03T19:03:39","slug":"java%e3%81%aeequals%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%82%92%e4%bd%bf%e3%81%86%e3%81%ab%e3%81%af%e3%80%81%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e3%81%99%e3%82%8c%e3%81%b0%e3%81%84%e3%81%84","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aeequals%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%82%92%e4%bd%bf%e3%81%86%e3%81%ab%e3%81%af%e3%80%81%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e3%81%99%e3%82%8c%e3%81%b0%e3%81%84%e3%81%84\/","title":{"rendered":"Java\u306eequals\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u306b\u306f\u3001\u3069\u306e\u3088\u3046\u306b\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f"},"content":{"rendered":"<p>Java\u3067\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306eequals()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u3001\u4e8c\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3067\u304d\u307e\u3059\u3002equals()\u30e1\u30bd\u30c3\u30c9\u306fObject\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308a\u3001\u5168\u3066\u306eJava\u30af\u30e9\u30b9\u306fObject\u30af\u30e9\u30b9\u3092\u7d99\u627f\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u5168\u3066\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>equals() \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u4e00\u822c\u7684\u306a\u624b\u9806\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059:<\/p>\n<ol>\n<li>\u7b2c1\u306b\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u3001null\u306e\u5834\u5408\u306ffalse\u3092\u8fd4\u3057\u307e\u3059\u3002<\/li>\n<li>2 \u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u540c\u3058\u53c2\u7167\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u307e\u3059\u3002\u540c\u3058\u53c2\u7167\u3067\u3042\u308c\u3070 true \u3092\u8fd4\u3057\u307e\u3059\u3002<\/li>\n<li>2\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u578b\u304c\u540c\u3058\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3057\u3001\u578b\u304c\u7570\u306a\u308c\u3070false\u3092\u8fd4\u3059\u3002<\/li>\n<li>2\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u578b\u304c\u540c\u4e00\u3067\u3042\u308c\u3070\u3001\u305d\u308c\u305e\u308c\u306e\u6027\u8cea\u3092\u5177\u4f53\u7684\u306a\u30d3\u30b8\u30cd\u30b9\u306e\u30cb\u30fc\u30ba\u306b\u5408\u308f\u305b\u3066\u6bd4\u8f03\u3057\u3066\u3001\u6027\u8cea\u304c\u540c\u4e00\u3067\u3042\u308c\u3070true\u3092\u8fd4\u5374\u3057\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u3070false\u3092\u8fd4\u5374\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u4f8b\u3048\u3070\u3001\u300cPerson\u300d\u3068\u3044\u3046\u540d\u524d\u306e\u30af\u30e9\u30b9\u304c\u3042\u308a\u3001\u305d\u306e\u30af\u30e9\u30b9\u306b\u306f\u300cname\u300d\u3068\u3044\u3046\u5c5e\u6027\u304c\u3042\u308b\u3053\u3068\u3092\u60f3\u5b9a\u3057\u307e\u3059\u30022\u3064\u306e\u300cPerson\u300d\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u300cname\u300d\u5c5e\u6027\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3059\u308b\u305f\u3081\u306b\u3001\u6b21\u306e\u3088\u3046\u306a\u300cequals()\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3067\u304d\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\r\n    <span class=\"hljs-comment\">\/\/ \u6784\u9020\u65b9\u6cd5\u3001getter\u548csetter\u7b49\u7701\u7565...<\/span>\r\n\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) { <span class=\"hljs-comment\">\/\/ \u5224\u65ad\u662f\u5426\u4e3a\u540c\u4e00\u5f15\u7528<\/span>\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()) { <span class=\"hljs-comment\">\/\/ \u5224\u65ad\u662f\u5426\u4e3anull\u6216\u7c7b\u578b\u4e0d\u540c<\/span>\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\">other<\/span> <span class=\"hljs-operator\">=<\/span> (Person) obj; <span class=\"hljs-comment\">\/\/ \u5c06obj\u8f6c\u6362\u4e3aPerson\u7c7b\u578b<\/span>\r\n        <span class=\"hljs-keyword\">return<\/span> name.equals(other.name); <span class=\"hljs-comment\">\/\/ \u5224\u65adname\u5c5e\u6027\u662f\u5426\u76f8\u7b49<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>Person\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306ename\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3059\u308b\u306b\u306f\u3001equals()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/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>);\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>);\r\n\r\nSystem.out.println(person1.equals(person2)); <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\uff1atrue<\/span>\r\n<\/code><\/pre>\n<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u7b49\u4fa1\u6027\u3092\u5224\u65ad\u3059\u308b\u305f\u3081\u306b\u72ec\u81ea\u306b\u5b9a\u7fa9\u3057\u305f\u30af\u30e9\u30b9\u3067equals()\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30e9\u30a4\u30c9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u901a\u5e38\uff12\u3064\u306e\u7b49\u4fa1\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u540c\u3058\u30cf\u30c3\u30b7\u30e5\u5024\u3092\u6301\u3064\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u306b\u306f\u3001hashCode()\u30e1\u30bd\u30c3\u30c9\u3082\u30aa\u30fc\u30d0\u30e9\u30a4\u30c9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306eequals()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u3001\u4e8c\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3067\u304d\u307e\u3059\u3002equals()\u30e1\u30bd\u30c3\u30c9\u306fObject\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308a\u3001\u5168\u3066\u306eJava\u30af\u30e9\u30b9\u306fObject\u30af\u30e9 [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-83319","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\u306eequals\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u306b\u306f\u3001\u3069\u306e\u3088\u3046\u306b\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f - 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\" 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content=\"Java\u3067\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306eequals()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u3001\u4e8c\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3067\u304d\u307e\u3059\u3002equals()\u30e1\u30bd\u30c3\u30c9\u306fObject\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308a\u3001\u5168\u3066\u306eJava\u30af\u30e9\u30b9\u306fObject\u30af\u30e9 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u306eequals\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u306b\u306f\u3001\u3069\u306e\u3088\u3046\u306b\u3059\u308c\u3070\u3044\u3044\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-20T17:42:18+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-03T19:03:39+00:00\" \/>\n<meta name=\"author\" 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