{"id":126680,"date":"2024-03-24T23:21:56","date_gmt":"2024-03-24T14:21:56","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e7%89%b9%e5%ae%9a%e3%81%ae%e3%83%95%e3%82%a3%e3%83%bc%e3%83%ab%e3%83%89%e3%81%ae%e5%a4%89%e6%9b%b4%e5%86%85%e5%ae%b9%e3%82%92%e7%9b%a3%e8%a6%96%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/"},"modified":"2024-04-04T14:22:57","modified_gmt":"2024-04-04T05:22:57","slug":"java%e3%81%a7%e7%89%b9%e5%ae%9a%e3%81%ae%e3%83%95%e3%82%a3%e3%83%bc%e3%83%ab%e3%83%89%e3%81%ae%e5%a4%89%e6%9b%b4%e5%86%85%e5%ae%b9%e3%82%92%e7%9b%a3%e8%a6%96%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e7%89%b9%e5%ae%9a%e3%81%ae%e3%83%95%e3%82%a3%e3%83%bc%e3%83%ab%e3%83%89%e3%81%ae%e5%a4%89%e6%9b%b4%e5%86%85%e5%ae%b9%e3%82%92%e7%9b%a3%e8%a6%96%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java\u3067\u7279\u5b9a\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5909\u66f4\u5185\u5bb9\u3092\u76e3\u8996\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>Java\u3067\u306f\u3001\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30fb\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3001\u3042\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5185\u5bb9\u5909\u66f4\u3092\u76e3\u8996\u3067\u304d\u307e\u3059\u3002\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30fb\u30d1\u30bf\u30fc\u30f3\u3068\u306f\u3001\u3042\u308b\u4e3b\u984c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8907\u6570\u306e\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30fb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u76e3\u8996\u3057\u3001\u4e3b\u984c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5909\u66f4\u3055\u308c\u305f\u6642\u70b9\u3067\u3001\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30fb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u901a\u77e5\u3092\u53d7\u3051\u308b\u30011\u5bfe\u591a\u306e\u95a2\u4fc2\u3092\u5b9a\u7fa9\u3059\u308b\u884c\u52d5\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n<p>\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30d1\u30bf\u30fc\u30f3\u3092\u5229\u7528\u3057\u3066\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5909\u66f4\u5185\u5bb9\u3092\u76e3\u8996\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u6b21\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u3001\u300c\u30ea\u30b9\u30f3\u3059\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u300d\u3068\u300c\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30ea\u30b9\u30c8\u300d\u3092\u6301\u3064Subject\u30af\u30e9\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.util.ArrayList;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.List;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Subject<\/span> {\r\n<span class=\"hljs-keyword\">private<\/span> String field;\r\n<span class=\"hljs-keyword\">private<\/span> List&lt;Observer&gt; observers = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ArrayList<\/span>&lt;&gt;();\r\n<span class=\"hljs-keyword\">public<\/span> String <span class=\"hljs-title function_\">getField<\/span><span class=\"hljs-params\">()<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> field;\r\n}\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">setField<\/span><span class=\"hljs-params\">(String field)<\/span> {\r\n<span class=\"hljs-built_in\">this<\/span>.field = field;\r\nnotifyObservers();\r\n}\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">attach<\/span><span class=\"hljs-params\">(Observer observer)<\/span> {\r\nobservers.add(observer);\r\n}\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">detach<\/span><span class=\"hljs-params\">(Observer observer)<\/span> {\r\nobservers.remove(observer);\r\n}\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">notifyObservers<\/span><span class=\"hljs-params\">()<\/span> {\r\n<span class=\"hljs-keyword\">for<\/span> (Observer observer : observers) {\r\nobserver.update();\r\n}\r\n}\r\n}\r\n<\/code><\/pre>\n<p>\u6b21\u306b\u3001\u66f4\u65b0\u30e1\u30bd\u30c3\u30c9\u3092\u542b\u3080\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">interface<\/span> <span class=\"hljs-title class_\">Observer<\/span> {\r\n<span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">update<\/span><span class=\"hljs-params\">()<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>\u6b21\u306b\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5909\u66f4\u5185\u5bb9\u3092\u51e6\u7406\u3059\u308b\u5177\u4f53\u7684\u306aObserver\u30af\u30e9\u30b9\u3092\u5b9f\u88c5\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_\">ConcreteObserver<\/span> <span class=\"hljs-keyword\">implements<\/span> <span class=\"hljs-title class_\">Observer<\/span> {\r\n<span class=\"hljs-keyword\">private<\/span> Subject subject;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title function_\">ConcreteObserver<\/span><span class=\"hljs-params\">(Subject subject)<\/span> {\r\n<span class=\"hljs-built_in\">this<\/span>.subject = subject;\r\nsubject.attach(<span class=\"hljs-built_in\">this<\/span>);\r\n}\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_\">update<\/span><span class=\"hljs-params\">()<\/span> {\r\n<span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">field<\/span> <span class=\"hljs-operator\">=<\/span> subject.getField();\r\n<span class=\"hljs-comment\">\/\/ \u5904\u7406\u5b57\u6bb5\u4fee\u6539\u7684\u5185\u5bb9<\/span>\r\nSystem.out.println(<span class=\"hljs-string\">\"\u5b57\u6bb5\u5185\u5bb9\u5df2\u4fee\u6539\u4e3a\uff1a\"<\/span> + field);\r\n}\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u308c\u3089\u306e\u30af\u30e9\u30b9\u306f\u6700\u5f8c\u306b main \u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u4f7f\u7528\u3055\u308c\u3001\u7279\u5b9a\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5909\u66f4\u3092\u76e3\u8996\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_\">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\">Subject<\/span> <span class=\"hljs-variable\">subject<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Subject<\/span>();\r\n<span class=\"hljs-type\">ConcreteObserver<\/span> <span class=\"hljs-variable\">observer<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ConcreteObserver<\/span>(subject);\r\nsubject.setField(<span class=\"hljs-string\">\"New Value\"<\/span>); <span class=\"hljs-comment\">\/\/ \u5b57\u6bb5\u5185\u5bb9\u5df2\u4fee\u6539\u4e3a\uff1aNew Value<\/span>\r\n}\r\n}\r\n<\/code><\/pre>\n<p>\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u5024\u3092\u8a2d\u5b9a\u3059\u308bsubject.setField(&#8220;\u65b0\u3057\u3044\u5024&#8221;)\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3068\u3001\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30aa\u30d6\u30b8\u30a7\u30af\u30c8observer\u306b\u901a\u77e5\u3055\u308c\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5909\u66f4\u5185\u5bb9\u304c\u51e6\u7406\u3055\u308c\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u3001\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30fb\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3001\u3042\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5185\u5bb9\u5909\u66f4\u3092\u76e3\u8996\u3067\u304d\u307e\u3059\u3002\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30fb\u30d1\u30bf\u30fc\u30f3\u3068\u306f\u3001\u3042\u308b\u4e3b\u984c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8907\u6570\u306e\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30fb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u76e3\u8996\u3057\u3001\u4e3b\u984c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5909\u66f4\u3055\u308c\u305f\u6642\u70b9\u3067\u3001\u30aa\u30d6 [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-126680","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\u3067\u7279\u5b9a\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5909\u66f4\u5185\u5bb9\u3092\u76e3\u8996\u3059\u308b\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\u3067\u7279\u5b9a\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5909\u66f4\u5185\u5bb9\u3092\u76e3\u8996\u3059\u308b\u65b9\u6cd5\/\" \/>\n<meta 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