{"id":117404,"date":"2024-03-23T10:15:45","date_gmt":"2024-03-23T01:15:45","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%82%a4%e3%83%b3%e3%82%b9%e3%82%bf%e3%83%b3%e3%82%b9-%e3%82%ad%e3%83%bc%e3%83%af%e3%83%bc%e3%83%89%e3%81%ae-java-%e3%81%a7%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9\/"},"modified":"2024-03-26T22:30:11","modified_gmt":"2024-03-26T13:30:11","slug":"%e3%82%a4%e3%83%b3%e3%82%b9%e3%82%bf%e3%83%b3%e3%82%b9-%e3%82%ad%e3%83%bc%e3%83%af%e3%83%bc%e3%83%89%e3%81%ae-java-%e3%81%a7%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%82%a4%e3%83%b3%e3%82%b9%e3%82%bf%e3%83%b3%e3%82%b9-%e3%82%ad%e3%83%bc%e3%83%af%e3%83%bc%e3%83%89%e3%81%ae-java-%e3%81%a7%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9\/","title":{"rendered":"\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9 \u30ad\u30fc\u30ef\u30fc\u30c9\u306e Java \u3067\u306e\u4f7f\u3044\u65b9"},"content":{"rendered":"<p>Java\u3067\u306f\u3001\u300cinstance\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u307e\u305f\u306f\u305d\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3057\u307e\u3059\u3002\u578b\u30c1\u30a7\u30c3\u30af\u3068\u578b\u5909\u63db\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u300cinstance\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4f7f\u3044\u304b\u305f\u3067\u3059\u3002<\/p>\n<ol>\n<li>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528<\/li>\n<\/ol>\n<p>\u6587\u6cd5\uff1a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 instanceof \u30af\u30e9\u30b9\u540d<\/p>\n<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30de\u30a4\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u5834\u5408\uff1a { \u2026 }<\/p>\n<ol>\n<li>\u7279\u5b9a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3059\u308b\u305f\u3081\u306b\u7528\u3044\u308b\uff1a<\/li>\n<\/ol>\n<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 instanceof \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u540d<\/p>\n<p>\u3082\u3057 (obj \u304c MyInterface \u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306a\u3089) { \u2026 }<\/p>\n<ol>\n<li>\u30c0\u30a6\u30f3\u30ad\u30e3\u30b9\u30c8\uff08\u30c0\u30a6\u30f3\u30ad\u30e3\u30b9\u30c8\u3057\u307e\u3059\uff09<\/li>\n<\/ol>\n<p>\u578b\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304b\u3089\u578b\u5909\u63db\u3092\u3059\u308b\u3068\u304d\u306f\u300cinstance\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u4f7f\u3048\u308b<\/p>\n<p>\u30b5\u30d6\u30af\u30e9\u30b9\u578b\uff08\u306e\uff09\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/p>\n<p>MyClass obj = (MyClass) \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30ad\u30e3\u30b9\u30c8\u3059\u308b;<\/p>\n<p>\u300cinstance\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u578b\u5909\u63db\u3092\u884c\u3046\u3068\u304d\u306f\u3001\u5bfe\u8c61\u304c\u5b9f\u969b\u306b\u76ee\u7684\u306e\u578b\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u5fc5\u8981\u3067\u3042\u308b\u3002\u305d\u3046\u3067\u306a\u3044\u3068ClassCastException\u4f8b\u5916\u304c\u767a\u751f\u3059\u308b\u3002\u305d\u306e\u305f\u3081\u3001\u578b\u5909\u63db\u3092\u884c\u3046\u524d\u306b\u300cinstance\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u578b\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\u3053\u3068\u304c\u671b\u307e\u3057\u3044\u3002<\/p>\n<p>\u7ffb\u8a33\u3059\u308b\u6587\u3092\u66f8\u3044\u3066\u304f\u3060\u3055\u3044\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_\">Main<\/span> {\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n<span class=\"hljs-type\">Object<\/span> <span class=\"hljs-variable\">obj1<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">MyClass<\/span>();\r\n<span class=\"hljs-type\">Object<\/span> <span class=\"hljs-variable\">obj2<\/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<span class=\"hljs-keyword\">if<\/span> (obj1 <span class=\"hljs-keyword\">instanceof<\/span> MyClass) {\r\n<span class=\"hljs-type\">MyClass<\/span> <span class=\"hljs-variable\">myObj1<\/span> <span class=\"hljs-operator\">=<\/span> (MyClass) obj1;\r\nmyObj1.myMethod();\r\n}\r\n<span class=\"hljs-keyword\">if<\/span> (obj2 <span class=\"hljs-keyword\">instanceof<\/span> MyClass) {\r\n<span class=\"hljs-type\">MyClass<\/span> <span class=\"hljs-variable\">myObj2<\/span> <span class=\"hljs-operator\">=<\/span> (MyClass) obj2; <span class=\"hljs-comment\">\/\/ \u8fd9\u91cc\u4f1a\u629b\u51faClassCastException\u5f02\u5e38<\/span>\r\nmyObj2.myMethod();\r\n}\r\n}\r\n}\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyClass<\/span> {\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">myMethod<\/span><span class=\"hljs-params\">()<\/span> {\r\nSystem.out.println(<span class=\"hljs-string\">\"MyClass method\"<\/span>);\r\n}\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001obj1 \u306f MyClass \u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306a\u306e\u3067\u3001\u578b\u5909\u63db\u306f\u5b89\u5168\u306b\u884c\u3048\u307e\u3059\u3002\u4e00\u65b9\u3001obj2 \u306f String \u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308a\u3001MyClass \u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u306f\u306a\u3044\u305f\u3081\u3001\u578b\u5909\u63db\u3059\u308b\u3068 ClassCastException \u4f8b\u5916\u304c\u30b9\u30ed\u30fc\u3055\u308c\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u3001\u300cinstance\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u307e\u305f\u306f\u305d\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3057\u307e\u3059\u3002\u578b\u30c1\u30a7\u30c3\u30af\u3068\u578b\u5909\u63db\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002 \u4ee5\u4e0b\u306f\u300cinstance\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4f7f\u3044\u304b\u305f\u3067 [&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-117404","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>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9 \u30ad\u30fc\u30ef\u30fc\u30c9\u306e Java \u3067\u306e\u4f7f\u3044\u65b9 - 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\/\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9-\u30ad\u30fc\u30ef\u30fc\u30c9\u306e-java-\u3067\u306e\u4f7f\u3044\u65b9\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9 \u30ad\u30fc\u30ef\u30fc\u30c9\u306e Java \u3067\u306e\u4f7f\u3044\u65b9\" \/>\n<meta property=\"og:description\" content=\"Java\u3067\u306f\u3001\u300cinstance\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u307e\u305f\u306f\u305d\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3057\u307e\u3059\u3002\u578b\u30c1\u30a7\u30c3\u30af\u3068\u578b\u5909\u63db\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002 \u4ee5\u4e0b\u306f\u300cinstance\u300d\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4f7f\u3044\u304b\u305f\u3067 [&hellip;]\" \/>\n<meta property=\"og:url\" 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