{"id":24760,"date":"2024-03-17T02:28:49","date_gmt":"2024-03-16T17:28:49","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/%e7%89%b9%e5%ae%9a%e3%81%ae%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ae%e3%81%99%e3%81%b9%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%8bjava\/"},"modified":"2024-03-22T09:54:27","modified_gmt":"2024-03-22T00:54:27","slug":"%e7%89%b9%e5%ae%9a%e3%81%ae%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ae%e3%81%99%e3%81%b9%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%8bjava","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e7%89%b9%e5%ae%9a%e3%81%ae%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ae%e3%81%99%e3%81%b9%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%8bjava\/","title":{"rendered":"\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u306e\u3059\u3079\u3066\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3059\u308bJava"},"content":{"rendered":"<p>Java\u3067\u306f\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u4f7f\u7528\u3057\u3066\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u306e\u3059\u3079\u3066\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\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\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(MyClass.class);\r\n        <span class=\"hljs-keyword\">for<\/span> (Class&lt;?&gt; clazz : subClasses) {\r\n            System.out.println(clazz.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\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\r\n            <span class=\"hljs-keyword\">for<\/span> (Class&lt;?&gt; clazz : classes) {\r\n                <span class=\"hljs-keyword\">if<\/span> (superClass.isAssignableFrom(clazz) &amp;&amp; !superClass.equals(clazz)) {\r\n                    subClasses.add(clazz);\r\n                }\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            String[] classPathEntries = System.getProperty(<span class=\"hljs-string\">\"java.class.path\"<\/span>).split(System.getProperty(<span class=\"hljs-string\">\"path.separator\"<\/span>));\r\n            <span class=\"hljs-keyword\">for<\/span> (String classpathEntry : classPathEntries) {\r\n                <span class=\"hljs-keyword\">if<\/span> (!classpathEntry.endsWith(<span class=\"hljs-string\">\".jar\"<\/span>)) { <span class=\"hljs-comment\">\/\/ \u4e0d\u626b\u63cfjar\u5305\u4e2d\u7684\u7c7b<\/span>\r\n                    <span class=\"hljs-type\">File<\/span> <span class=\"hljs-variable\">base<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">File<\/span>(classpathEntry + File.separatorChar + path);\r\n                    <span class=\"hljs-keyword\">if<\/span> (base.exists() &amp;&amp; base.isDirectory()) {\r\n                        File[] files = base.listFiles();\r\n                        <span class=\"hljs-keyword\">if<\/span> (files != <span class=\"hljs-literal\">null<\/span>) {\r\n                            <span class=\"hljs-keyword\">for<\/span> (File file : files) {\r\n                                <span class=\"hljs-keyword\">if<\/span> (file.isFile() &amp;&amp; file.getName().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.getName().substring(<span class=\"hljs-number\">0<\/span>, file.getName().length() - <span class=\"hljs-number\">6<\/span>);\r\n                                    <span class=\"hljs-keyword\">try<\/span> {\r\n                                        classes.add(Class.forName(className));\r\n                                    } <span class=\"hljs-keyword\">catch<\/span> (ClassNotFoundException e) {\r\n                                        e.printStackTrace();\r\n                                    }\r\n                                }\r\n                            }\r\n                        }\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_\">MyClass<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u7236\u7c7b<\/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_\">MyClass<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u5b50\u7c7b1<\/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_\">MyClass<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u5b50\u7c7b2<\/span>\r\n}\r\n\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">SubClass3<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">MyClass<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u5b50\u7c7b3<\/span>\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001MyClass\u304c\u89aa\u30af\u30e9\u30b9\u3067\u3042\u308a\u3001SubClass1\u3001SubClass2\u3001SubClass3\u304c\u5b50\u30af\u30e9\u30b9\u3067\u3059\u3002getSubClasses\u30e1\u30bd\u30c3\u30c9\u306f\u3059\u3079\u3066\u306e\u30af\u30e9\u30b9\u3092\u8d70\u67fb\u3057\u3001superClass\u3092\u7d99\u627f\u3057\u3066\u3044\u308b\u3059\u3079\u3066\u306e\u5b50\u30af\u30e9\u30b9\u3092\u898b\u3064\u3051\u3001\u305d\u308c\u3089\u3092List&lt;Class&lt;?&gt;&gt;\u306b\u8ffd\u52a0\u3057\u3066\u8fd4\u3057\u307e\u3059\u3002getSubClasses(MyClass.class)\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u3001MyClass\u306e\u3059\u3079\u3066\u306e\u5b50\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u7279\u306b\u591a\u304f\u306e\u30af\u30e9\u30b9\u304c\u3042\u308b\u5834\u5408\u306b\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u4f7f\u7528\u3057\u3066\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u306e\u3059\u3079\u3066\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\uff1a import java.util.ArrayList; import java.uti [&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-24760","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>\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u306e\u3059\u3079\u3066\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3059\u308bJava - 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\/\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u306e\u3059\u3079\u3066\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3059\u308bjava\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u306e\u3059\u3079\u3066\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3059\u308bJava\" \/>\n<meta property=\"og:description\" content=\"Java\u3067\u306f\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u4f7f\u7528\u3057\u3066\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u306e\u3059\u3079\u3066\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\uff1a import java.util.ArrayList; import java.uti [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u306e\u3059\u3079\u3066\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3059\u308bjava\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-16T17:28:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T00:54:27+00:00\" \/>\n<meta name=\"author\" content=\"\u967d, \u5411\u5b87\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u967d, \u5411\u5b87\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"1\u5206\" \/>\n<script type=\"application\/ld+json\" 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