{"id":11954,"date":"2024-03-15T10:40:47","date_gmt":"2024-03-15T01:40:47","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%81%ae%e3%83%81%e3%82%a7%e3%83%bc%e3%83%b3%e3%82%aa%e3%83%96%e3%83%ac%e3%82%b9%e3%83%9d%e3%83%b3%e3%82%b7%e3%83%93%e3%83%aa%e3%83%86%e3%82%a3%e3%83%bc%e3%83%91%e3%82%bf%e3%83%bc%e3%83%b3\/"},"modified":"2025-08-05T10:12:46","modified_gmt":"2025-08-05T01:12:46","slug":"java-%e3%81%ae%e3%83%81%e3%82%a7%e3%83%bc%e3%83%b3%e3%82%aa%e3%83%96%e3%83%ac%e3%82%b9%e3%83%9d%e3%83%b3%e3%82%b7%e3%83%93%e3%83%aa%e3%83%86%e3%82%a3%e3%83%bc%e3%83%91%e3%82%bf%e3%83%bc%e3%83%b3","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%81%ae%e3%83%81%e3%82%a7%e3%83%bc%e3%83%b3%e3%82%aa%e3%83%96%e3%83%ac%e3%82%b9%e3%83%9d%e3%83%b3%e3%82%b7%e3%83%93%e3%83%aa%e3%83%86%e3%82%a3%e3%83%bc%e3%83%91%e3%82%bf%e3%83%bc%e3%83%b3\/","title":{"rendered":"Java \u306e\u30c1\u30a7\u30fc\u30f3\u30aa\u30d6\u30ec\u30b9\u30dd\u30f3\u30b7\u30d3\u30ea\u30c6\u30a3\u30fc\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"<p>Java\u306b\u304a\u3051\u308b\u8cac\u4efb\u9023\u9396\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u65b9\u6cd5\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<ol>\n<li>Handler\u3068\u3044\u3046\u62bd\u8c61\u51e6\u7406\u30af\u30e9\u30b9\u3092\u5b9a\u7fa9\u3057\u3001\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u51e6\u7406\u3059\u308b\u305f\u3081\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u542b\u307f\u3001\u6b21\u306e\u51e6\u7406\u30af\u30e9\u30b9\u3078\u306e\u53c2\u7167\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u3053\u306e\u30af\u30e9\u30b9\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u307e\u305f\u306f\u62bd\u8c61\u30af\u30e9\u30b9\u3068\u3057\u3066\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n<li>\u5177\u4f53\u51e6\u7406\u8005\uff08ConcreteHandler\uff09\u30af\u30e9\u30b9\u3092\u5b9a\u7fa9\u3057\u3001\u62bd\u8c61\u51e6\u7406\u8005\u30af\u30e9\u30b9\u3092\u7d99\u627f\u307e\u305f\u306f\u5b9f\u88c5\u3057\u3001\u305d\u306e\u51e6\u7406\u65b9\u6cd5\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002\u51e6\u7406\u65b9\u6cd5\u306e\u4e2d\u3067\u3001\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u51e6\u7406\u3067\u304d\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u3001\u53ef\u80fd\u3067\u3042\u308c\u3070\u51e6\u7406\u3057\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u6b21\u306e\u51e6\u7406\u8005\u306b\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u6e21\u3057\u307e\u3059\u3002<\/li>\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u306e\u30b3\u30fc\u30c9\u3067\u3001\u51e6\u7406\u30c1\u30a7\u30fc\u30f3\u3092\u4f5c\u6210\u3057\u3001\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u9806\u756a\u306b\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u30c1\u30a7\u30fc\u30f3\u5185\u306e\u51e6\u7406\u5668\u306b\u6e21\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u4ee5\u4e0b\u306f\u4f8b\u3067\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-comment\">\/\/ \u62bd\u8c61\u5904\u7406\u5668\u7c7b<\/span>\r\n<span class=\"hljs-keyword\">abstract<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Handler<\/span> {\r\n    <span class=\"hljs-keyword\">protected<\/span> Handler nextHandler;\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">setNextHandler<\/span><span class=\"hljs-params\">(Handler nextHandler)<\/span> {\r\n        <span class=\"hljs-built_in\">this<\/span>.nextHandler = nextHandler;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">abstract<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">handleRequest<\/span><span class=\"hljs-params\">(String request)<\/span>;\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ \u5177\u4f53\u5904\u7406\u5668\u7c7b1<\/span>\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">ConcreteHandler1<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">Handler<\/span> {\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">handleRequest<\/span><span class=\"hljs-params\">(String request)<\/span> {\r\n        <span class=\"hljs-keyword\">if<\/span> (request.equals(<span class=\"hljs-string\">\"request1\"<\/span>)) {\r\n            System.out.println(<span class=\"hljs-string\">\"ConcreteHandler1 handles request1\"<\/span>);\r\n        } <span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-keyword\">if<\/span> (nextHandler != <span class=\"hljs-literal\">null<\/span>) {\r\n            nextHandler.handleRequest(request);\r\n        }\r\n    }\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ \u5177\u4f53\u5904\u7406\u5668\u7c7b2<\/span>\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">ConcreteHandler2<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">Handler<\/span> {\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">handleRequest<\/span><span class=\"hljs-params\">(String request)<\/span> {\r\n        <span class=\"hljs-keyword\">if<\/span> (request.equals(<span class=\"hljs-string\">\"request2\"<\/span>)) {\r\n            System.out.println(<span class=\"hljs-string\">\"ConcreteHandler2 handles request2\"<\/span>);\r\n        } <span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-keyword\">if<\/span> (nextHandler != <span class=\"hljs-literal\">null<\/span>) {\r\n            nextHandler.handleRequest(request);\r\n        }\r\n    }\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ \u5ba2\u6237\u7aef\u4ee3\u7801<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Client<\/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\">Handler<\/span> <span class=\"hljs-variable\">handler1<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ConcreteHandler1<\/span>();\r\n        <span class=\"hljs-type\">Handler<\/span> <span class=\"hljs-variable\">handler2<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ConcreteHandler2<\/span>();\r\n\r\n        handler1.setNextHandler(handler2);\r\n\r\n        handler1.handleRequest(<span class=\"hljs-string\">\"request1\"<\/span>);\r\n        handler1.handleRequest(<span class=\"hljs-string\">\"request2\"<\/span>);\r\n        handler1.handleRequest(<span class=\"hljs-string\">\"request3\"<\/span>);\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u7d50\u679c\u306f\u51fa\u529b\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"post-pre\"><code>ConcreteHandler1 handles request1\r\nConcreteHandler2 handles request2\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001\u62bd\u8c61\u51e6\u7406\u30af\u30e9\u30b9\u306fhandleRequest\u3068\u3044\u3046\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u3001\u5177\u4f53\u7684\u306a\u51e6\u7406\u30af\u30e9\u30b9\u306f\u305d\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u7d99\u627f\u3057\u3066\u5b9f\u88c5\u3057\u3066\u3044\u307e\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b3\u30fc\u30c9\u3067\u306f\u3001\u30cf\u30f3\u30c9\u30e9\u30fc\u30c1\u30a7\u30fc\u30f3\u304c\u4f5c\u6210\u3055\u308c\u3001\u30ea\u30af\u30a8\u30b9\u30c8\u304c\u9806\u756a\u306b\u30cf\u30f3\u30c9\u30e9\u30fc\u306b\u6e21\u3055\u308c\u307e\u3059\u3002\u30cf\u30f3\u30c9\u30e9\u30fc\u306e1\u3064\u304c\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u51e6\u7406\u3067\u304d\u308c\u3070\u51e6\u7406\u3057\u3001\u51e6\u7406\u3067\u304d\u306a\u3044\u5834\u5408\u306f\u6b21\u306e\u30cf\u30f3\u30c9\u30e9\u30fc\u306b\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u6e21\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306b\u304a\u3051\u308b\u8cac\u4efb\u9023\u9396\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u65b9\u6cd5\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a Handler\u3068\u3044\u3046\u62bd\u8c61\u51e6\u7406\u30af\u30e9\u30b9\u3092\u5b9a\u7fa9\u3057\u3001\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u51e6\u7406\u3059\u308b\u305f\u3081\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u542b\u307f\u3001\u6b21\u306e\u51e6\u7406\u30af\u30e9\u30b9\u3078\u306e\u53c2\u7167\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u3053\u306e\u30af\u30e9\u30b9\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u307e\u305f [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-11954","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"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\u30c1\u30a7\u30fc\u30f3\u30aa\u30d6\u30ec\u30b9\u30dd\u30f3\u30b7\u30d3\u30ea\u30c6\u30a3\u30fc\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Java \u306e\u30c1\u30a7\u30fc\u30f3\u30aa\u30d6\u30ec\u30b9\u30dd\u30f3\u30b7\u30d3\u30ea\u30c6\u30a3\u30fc\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\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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