{"id":24328,"date":"2024-03-17T01:04:40","date_gmt":"2024-03-16T16:04:40","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%e4%b8%ad%e3%81%a7%e3%80%81%e3%81%a8equals%e3%81%ae%e4%bd%bf%e7%94%a8%e5%a0%b4%e9%9d%a2%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/"},"modified":"2024-03-22T08:53:48","modified_gmt":"2024-03-21T23:53:48","slug":"java%e3%81%ae%e4%b8%ad%e3%81%a7%e3%80%81%e3%81%a8equals%e3%81%ae%e4%bd%bf%e7%94%a8%e5%a0%b4%e9%9d%a2%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%e4%b8%ad%e3%81%a7%e3%80%81%e3%81%a8equals%e3%81%ae%e4%bd%bf%e7%94%a8%e5%a0%b4%e9%9d%a2%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/","title":{"rendered":"Java\u306e\u4e2d\u3067\u3001==\u3068equals\u306e\u4f7f\u7528\u5834\u9762\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"<p>Java\u3067\u306f\u3001&#8221;==&#8221;\u6f14\u7b97\u5b50\u3068equals()\u30e1\u30bd\u30c3\u30c9\u306f\u7570\u306a\u308b\u7528\u9014\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ol>\n<li>&#8220;==\u3092\u4f7f\u7528\u3057\u3066\u30012\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u53c2\u7167\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3059\u308b\u65b9\u6cd5\u3067\u3059\u30022\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092==\u3067\u6bd4\u8f03\u3059\u308b\u3068\u3001\u540c\u3058\u30e1\u30e2\u30ea\u30a2\u30c9\u30ec\u30b9\u3092\u53c2\u7167\u3057\u3066\u3044\u308b\u5834\u5408\u306ftrue\u3092\u8fd4\u3057\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306ffalse\u3092\u8fd4\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u901a\u5e38\u30012\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u540c\u3058\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002&#8221;<\/li>\n<\/ol>\n<p>\u65e5\u672c\u8a9e\u3067\u306e\u9069\u5207\u306a\u4f8b\u3067\u3059\u3002<br \/>\n\u4f8b\u3048\u3070\u3001<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">str1<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"hello\"<\/span>;\r\n<span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">str2<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"hello\"<\/span>;\r\n<span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">str3<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">String<\/span>(<span class=\"hljs-string\">\"hello\"<\/span>);\r\n\r\nSystem.out.println(str1 == str2); <span class=\"hljs-comment\">\/\/ true\uff0c\u56e0\u4e3astr1\u548cstr2\u5f15\u7528\u4e86\u540c\u4e00\u4e2a\u5b57\u7b26\u4e32\u5e38\u91cf<\/span>\r\nSystem.out.println(str1 == str3); <span class=\"hljs-comment\">\/\/ false\uff0c\u56e0\u4e3astr1\u548cstr3\u5f15\u7528\u7684\u662f\u4e0d\u540c\u7684\u5bf9\u8c61<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>equals()\u30e1\u30bd\u30c3\u30c9\u306f\u30012\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5185\u5bb9\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u4e00\u822c\u7684\u306b\u306f\u3001\u30ab\u30b9\u30bf\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5185\u5bb9\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306bequals()\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001equals()\u30e1\u30bd\u30c3\u30c9\u306f&#8221;==&#8221;\u3068\u540c\u69d8\u306e\u52d5\u4f5c\u3092\u3057\u30012\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<\/li>\n<\/ol>\n<p>\u4f8b\u3048\u3070\u3001<\/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\r\n    <span class=\"hljs-comment\">\/\/ \u7701\u7565\u6784\u9020\u65b9\u6cd5\u548c\u5176\u4ed6\u4ee3\u7801<\/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) {\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\r\n<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\">\"Bob\"<\/span>, <span class=\"hljs-number\">30<\/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\">\"Alice\"<\/span>, <span class=\"hljs-number\">25<\/span>);\r\n\r\nSystem.out.println(person1.equals(person2)); <span class=\"hljs-comment\">\/\/ false\uff0c\u56e0\u4e3aname\u548cage\u4e0d\u540c<\/span>\r\nSystem.out.println(person1.equals(person3)); <span class=\"hljs-comment\">\/\/ true\uff0c\u56e0\u4e3aname\u548cage\u76f8\u540c<\/span>\r\n<\/code><\/pre>\n<p>\u307e\u3068\u3081\uff1a &#8220;==&#8221; \u3092\u4f7f\u7528\u3057\u30662\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u540c\u3058\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u3001equals\uff08\uff09\u3092\u4f7f\u7528\u3057\u30662\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5185\u5bb9\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002\u901a\u5e38\u3001\u5b9f\u969b\u306e\u30cb\u30fc\u30ba\u306b\u5fdc\u3058\u3066equals\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u518d\u5b9a\u7fa9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u3001&#8221;==&#8221;\u6f14\u7b97\u5b50\u3068equals()\u30e1\u30bd\u30c3\u30c9\u306f\u7570\u306a\u308b\u7528\u9014\u304c\u3042\u308a\u307e\u3059\u3002 &#8220;==\u3092\u4f7f\u7528\u3057\u3066\u30012\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u53c2\u7167\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3059\u308b\u65b9\u6cd5\u3067\u3059\u30022\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092==\u3067 [&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-24328","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\u306e\u4e2d\u3067\u3001==\u3068equals\u306e\u4f7f\u7528\u5834\u9762\u306f\u4f55\u3067\u3059\u304b\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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