{"id":90829,"date":"2024-03-21T13:02:44","date_gmt":"2024-03-21T04:02:44","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e5%85%a8%e3%81%a6%e3%81%ae%e3%82%b5%e3%83%96%e3%82%af%e3%83%a9%e3%82%b9%e3%82%92%e5%8f%96%e5%be%97%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/"},"modified":"2024-04-04T04:43:31","modified_gmt":"2024-04-03T19:43:31","slug":"java%e3%81%a7%e5%85%a8%e3%81%a6%e3%81%ae%e3%82%b5%e3%83%96%e3%82%af%e3%83%a9%e3%82%b9%e3%82%92%e5%8f%96%e5%be%97%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%e5%85%a8%e3%81%a6%e3%81%ae%e3%82%b5%e3%83%96%e3%82%af%e3%83%a9%e3%82%b9%e3%82%92%e5%8f%96%e5%be%97%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java\u3067\u5168\u3066\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>Java\u3067\u306f\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3059\u3079\u3066\u306e\u5b50\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002\u624b\u9806\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ol>\n<li>\u89aa\u306e class \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002Class.forName() \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u304b\u3001\u89aa\u306e class. \u5c5e\u6027\u3092\u76f4\u63a5\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n<li>\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u901a\u3058\u3066\u3001getSubclasses()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u3001\u89aa\u30af\u30e9\u30b9\u306e\u3059\u3079\u3066\u306e\u5b50\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u30cd\u30a4\u30c6\u30a3\u30d6\u306a\u65e5\u672c\u8a9e\u3067\u306e\u8a00\u3044\u63db\u3048\uff1a\u4e00\u3064\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/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\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">SubClassExample<\/span> {\r\n\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        List&lt;Class&lt;?&gt;&gt; subClasses = getSubClasses(ParentClass.class);\r\n        <span class=\"hljs-keyword\">for<\/span> (Class&lt;?&gt; subClass : subClasses) {\r\n            System.out.println(subClass.getName());\r\n        }\r\n    }\r\n    \r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> List&lt;Class&lt;?&gt;&gt; getSubClasses(Class&lt;?&gt; superClass) {\r\n        List&lt;Class&lt;?&gt;&gt; subClasses = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ArrayList<\/span>&lt;&gt;();\r\n        Package[] packages = Package.getPackages();\r\n        <span class=\"hljs-keyword\">for<\/span> (Package pkg : packages) {\r\n            <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">packageName<\/span> <span class=\"hljs-operator\">=<\/span> pkg.getName();\r\n            List&lt;Class&lt;?&gt;&gt; classes = getClasses(packageName);\r\n            <span class=\"hljs-keyword\">for<\/span> (Class&lt;?&gt; clazz : classes) {\r\n                <span class=\"hljs-keyword\">if<\/span> (superClass.isAssignableFrom(clazz)) {\r\n                    subClasses.add(clazz);\r\n                }\r\n            }\r\n        }\r\n        <span class=\"hljs-keyword\">return<\/span> subClasses;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> List&lt;Class&lt;?&gt;&gt; getClasses(String packageName) {\r\n        List&lt;Class&lt;?&gt;&gt; classes = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ArrayList<\/span>&lt;&gt;();\r\n        <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">path<\/span> <span class=\"hljs-operator\">=<\/span> packageName.replace(<span class=\"hljs-string\">'.'<\/span>, <span class=\"hljs-string\">'\/'<\/span>);\r\n        <span class=\"hljs-keyword\">try<\/span> {\r\n            <span class=\"hljs-type\">ClassLoader<\/span> <span class=\"hljs-variable\">classLoader<\/span> <span class=\"hljs-operator\">=<\/span> Thread.currentThread().getContextClassLoader();\r\n            java.net.<span class=\"hljs-type\">URL<\/span> <span class=\"hljs-variable\">resource<\/span> <span class=\"hljs-operator\">=<\/span> classLoader.getResource(path);\r\n            java.io.<span class=\"hljs-type\">File<\/span> <span class=\"hljs-variable\">directory<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">java<\/span>.io.File(resource.getFile());\r\n            <span class=\"hljs-keyword\">if<\/span> (directory.exists()) {\r\n                String[] files = directory.list();\r\n                <span class=\"hljs-keyword\">for<\/span> (String file : files) {\r\n                    <span class=\"hljs-keyword\">if<\/span> (file.endsWith(<span class=\"hljs-string\">\".class\"<\/span>)) {\r\n                        <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">className<\/span> <span class=\"hljs-operator\">=<\/span> packageName + <span class=\"hljs-string\">'.'<\/span> + file.substring(<span class=\"hljs-number\">0<\/span>, file.length() - <span class=\"hljs-number\">6<\/span>);\r\n                        Class&lt;?&gt; clazz = Class.forName(className);\r\n                        classes.add(clazz);\r\n                    }\r\n                }\r\n            }\r\n        } <span class=\"hljs-keyword\">catch<\/span> (Exception e) {\r\n            e.printStackTrace();\r\n        }\r\n        <span class=\"hljs-keyword\">return<\/span> classes;\r\n    }\r\n}\r\n\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">ParentClass<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u7236\u7c7b\u7684\u4ee3\u7801<\/span>\r\n}\r\n\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">SubClass1<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">ParentClass<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u5b50\u7c7b1\u7684\u4ee3\u7801<\/span>\r\n}\r\n\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">SubClass2<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">ParentClass<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u5b50\u7c7b2\u7684\u4ee3\u7801<\/span>\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306f\u6b21\u306e\u3053\u3068\u3092\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>SubClass1\r\nSubClass2\r\n<\/code><\/pre>\n<p>\u3053\u306e\u4f8b\u306f\u3001\u7279\u5b9a\u306e\u89aa\u30af\u30e9\u30b9\u306e\u3059\u3079\u3066\u306e\u5b50\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u81ea\u5206\u81ea\u8eab\u306e\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u5909\u66f4\u3057\u3066\u62e1\u5f35\u3067\u304d\u307e\u3059\u3002\u5b50\u30af\u30e9\u30b9\u306e\u53d6\u5f97\u30d7\u30ed\u30bb\u30b9\u306f\u5b9f\u884c\u6642\u306b\u5b9f\u884c\u3055\u308c\u308b\u305f\u3081\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3059\u3079\u3066\u306e\u5b50\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002\u624b\u9806\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002 \u89aa\u306e class \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002Class.forName() \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u304b\u3001\u89aa\u306e class. \u5c5e\u6027\u3092\u76f4 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-90829","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\u5168\u3066\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u53d6\u5f97\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\" 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