{"id":118387,"date":"2024-03-23T14:12:37","date_gmt":"2024-03-23T05:12:37","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%81%ae%e3%82%b8%e3%82%a7%e3%83%8d%e3%83%aa%e3%82%af%e3%82%b9%e3%82%92%e3%82%a8%e3%83%b3%e3%83%86%e3%82%a3%e3%83%86%e3%82%a3%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99\/"},"modified":"2024-03-28T06:25:56","modified_gmt":"2024-03-27T21:25:56","slug":"java-%e3%81%ae%e3%82%b8%e3%82%a7%e3%83%8d%e3%83%aa%e3%82%af%e3%82%b9%e3%82%92%e3%82%a8%e3%83%b3%e3%83%86%e3%82%a3%e3%83%86%e3%82%a3%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%81%ae%e3%82%b8%e3%82%a7%e3%83%8d%e3%83%aa%e3%82%af%e3%82%b9%e3%82%92%e3%82%a8%e3%83%b3%e3%83%86%e3%82%a3%e3%83%86%e3%82%a3%e3%82%af%e3%83%a9%e3%82%b9%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99\/","title":{"rendered":"Java \u306e\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3092\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>Java\u3067\u306f\u3001\u578b\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3092\u4f7f\u7528\u3067\u304d\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306b\u5909\u63db\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u4f7f\u7528\u3057\u3066\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u3001T \u304c\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u578b\u3092\u8868\u3059\u3001\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u30af\u30e9\u30b9 MyClass \u304c\u3042\u308b\u3068\u4eee\u5b9a\u3057\u307e\u3059\u3002\u3053\u306e\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u578b\u3092\u5b9f\u4f53\u30af\u30e9\u30b9\u306b\u5909\u63db\u3059\u308b\u306b\u306f\u3001\u6b21\u306e\u624b\u9806\u3092\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u578b\u306e\u578b\u5f15\u6570\u53d6\u5f97\uff1aClass \u3092\u7528\u3044\u3066\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u578b\u5f15\u6570\u53d6\u5f97\u304c\u53ef\u80fd\u3002\u4f8b\u3048\u3070\u3001Class clazz = (Class) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0]; \u3068\u8a18\u8ff0\u3002getClass().getGenericSuperclass() \u3067\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u578b\u306e\u89aa\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3057\u3001getActualTypeArguments() \u3067\u578b\u5f15\u6570\u914d\u5217\u3092\u53d6\u5f97\u5f8c\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9 0 \u3067\u5177\u4f53\u7684\u306a\u578b\u5f15\u6570\u53d6\u5f97\u3002<\/li>\n<li>\u53cd\u5c04\u3092\u4f7f\u7528\u3057\u3066\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3 \u043a\u043b\u0430 \u043a\u043b\u0430\u0441\u0441\u0430sses\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001T entity = clazz.newInstance()\u3067\u3059\u3002clazz.newInstance()\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3 \u043a\u043b\u0430 \u043a\u043b\u0430\u0441\u0441\u0430sses\u30af\u30e9\u30b9\u306e\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n<li>\u5b9f\u4f53\u30af\u30e9\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u64cd\u4f5c\uff1a\u5177\u4f53\u7684\u306a\u30cb\u30fc\u30ba\u306b\u57fa\u3065\u3044\u3066\u3001\u5b9f\u4f53\u30af\u30e9\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u64cd\u4f5c\u3067\u304d\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u5024\u306e\u8a2d\u5b9a\u3084\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u306a\u3069\u3067\u3059\u3002<\/li>\n<\/ol>\n<p>\u4ee5\u4e0b\u306b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.lang.reflect.ParameterizedType;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyClass<\/span>&lt;T&gt; {\r\n<span class=\"hljs-keyword\">private<\/span> Class&lt;T&gt; clazz;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title function_\">MyClass<\/span><span class=\"hljs-params\">()<\/span> {\r\n<span class=\"hljs-built_in\">this<\/span>.clazz = (Class&lt;T&gt;) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[<span class=\"hljs-number\">0<\/span>];\r\n}\r\n<span class=\"hljs-keyword\">public<\/span> T <span class=\"hljs-title function_\">convertToEntity<\/span><span class=\"hljs-params\">()<\/span> <span class=\"hljs-keyword\">throws<\/span> IllegalAccessException, InstantiationException {\r\n<span class=\"hljs-type\">T<\/span> <span class=\"hljs-variable\">entity<\/span> <span class=\"hljs-operator\">=<\/span> clazz.newInstance();\r\n<span class=\"hljs-comment\">\/\/ <span class=\"hljs-doctag\">TODO:<\/span> \u5bf9\u5b9e\u4f53\u7c7b\u5bf9\u8c61\u8fdb\u884c\u64cd\u4f5c<\/span>\r\n<span class=\"hljs-keyword\">return<\/span> entity;\r\n}\r\n}\r\n<\/code><\/pre>\n<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u3092\u5b9a\u7fa9\u3057\u3066\u304b\u3089\u3001\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3057\u3001convertToEntity()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3068\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\uff08\u4f8b\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyEntity<\/span> {\r\n<span class=\"hljs-comment\">\/\/ <span class=\"hljs-doctag\">TODO:<\/span> \u5b9a\u4e49\u5b9e\u4f53\u7c7b\u7684\u5c5e\u6027\u548c\u65b9\u6cd5<\/span>\r\n}\r\n<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> <span class=\"hljs-keyword\">throws<\/span> InstantiationException, IllegalAccessException {\r\nMyClass&lt;MyEntity&gt; myClass = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">MyClass<\/span>&lt;&gt;();\r\n<span class=\"hljs-type\">MyEntity<\/span> <span class=\"hljs-variable\">entity<\/span> <span class=\"hljs-operator\">=<\/span> myClass.convertToEntity();\r\n<span class=\"hljs-comment\">\/\/ <span class=\"hljs-doctag\">TODO:<\/span> \u5bf9\u5b9e\u4f53\u7c7b\u5bf9\u8c61\u8fdb\u884c\u64cd\u4f5c<\/span>\r\n}\r\n}\r\n<\/code><\/pre>\n<p>Java\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3092\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306f\u4ee5\u4e0a\u3067\u3059\u3002\u5909\u63db\u306b\u306f\u898f\u5247\u304c\u3042\u308a\u3001\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u30af\u30e9\u30b9\u306e\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u3068\u5bfe\u5fdc\u3055\u305b\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306f\u578b\u5909\u63db\u306e\u4f8b\u5916\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\u578b\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3092\u4f7f\u7528\u3067\u304d\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306b\u5909\u63db\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u4f7f\u7528\u3057\u3066\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002 \u307e\u305a\u3001T \u304c\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u578b\u3092\u8868\u3059\u3001\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u30af\u30e9\u30b9 MyClass [&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-118387","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 \u306e\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3092\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306b\u5909\u63db\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-\u306e\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3092\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306b\u5909\u63db\u3059\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java \u306e\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3092\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"Java\u3067\u306f\u3001\u578b\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3092\u4f7f\u7528\u3067\u304d\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306b\u5909\u63db\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u4f7f\u7528\u3057\u3066\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002 \u307e\u305a\u3001T \u304c\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u578b\u3092\u8868\u3059\u3001\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u30af\u30e9\u30b9 MyClass [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java-\u306e\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3092\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306b\u5909\u63db\u3059\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-23T05:12:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-27T21:25:56+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<script type=\"application\/ld+json\" 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