{"id":134393,"date":"2024-03-26T07:36:45","date_gmt":"2024-03-25T22:36:45","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%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%a7%e3%83%87%e3%83%95%e3%82%a9%e3%83%ab%e3%83%88%e5%80%a4%e3%82%92%e8%a8%ad%e5%ae%9a%e3%81%99\/"},"modified":"2024-04-04T06:06:48","modified_gmt":"2024-04-03T21:06:48","slug":"java%e3%81%ae%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%a7%e3%83%87%e3%83%95%e3%82%a9%e3%83%ab%e3%83%88%e5%80%a4%e3%82%92%e8%a8%ad%e5%ae%9a%e3%81%99","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%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%a7%e3%83%87%e3%83%95%e3%82%a9%e3%83%ab%e3%83%88%e5%80%a4%e3%82%92%e8%a8%ad%e5%ae%9a%e3%81%99\/","title":{"rendered":"Java\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>Java\u3067\u306f\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3059. \u4ee5\u4e0b\u306f\u305d\u306e\u4f8b\u3067\u3059<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Entity<\/span> {\r\n<span class=\"hljs-meta\">@DefaultValue(\"John\")<\/span>\r\n<span class=\"hljs-keyword\">private<\/span> String name;\r\n<span class=\"hljs-meta\">@DefaultValue(\"25\")<\/span>\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-type\">int<\/span> age;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title function_\">Entity<\/span><span class=\"hljs-params\">()<\/span> {\r\n<span class=\"hljs-comment\">\/\/ \u4f7f\u7528\u53cd\u5c04\u83b7\u53d6\u5b57\u6bb5\u4e0a\u7684DefaultValue\u6ce8\u89e3\uff0c\u5e76\u5c06\u6ce8\u89e3\u4e2d\u6307\u5b9a\u7684\u503c\u8d4b\u7ed9\u5b57\u6bb5<\/span>\r\n<span class=\"hljs-keyword\">for<\/span> (Field field : getClass().getDeclaredFields()) {\r\n<span class=\"hljs-type\">DefaultValue<\/span> <span class=\"hljs-variable\">annotation<\/span> <span class=\"hljs-operator\">=<\/span> field.getAnnotation(DefaultValue.class);\r\n<span class=\"hljs-keyword\">if<\/span> (annotation != <span class=\"hljs-literal\">null<\/span>) {\r\n<span class=\"hljs-keyword\">try<\/span> {\r\nfield.setAccessible(<span class=\"hljs-literal\">true<\/span>);\r\nfield.set(<span class=\"hljs-built_in\">this<\/span>, annotation.value());\r\n} <span class=\"hljs-keyword\">catch<\/span> (IllegalAccessException e) {\r\ne.printStackTrace();\r\n}\r\n}\r\n}\r\n}\r\n<span class=\"hljs-keyword\">public<\/span> String <span class=\"hljs-title function_\">getName<\/span><span class=\"hljs-params\">()<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> name;\r\n}\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">getAge<\/span><span class=\"hljs-params\">()<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> age;\r\n}\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001\u72ec\u81ea\u306eDefaultValue\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\u3057\u307e\u3057\u305f\u3002 \u6b21\u306b\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4e2d\u3067\u3001\u53cd\u5c04\u3092\u4f7f\u3063\u3066\u3059\u3079\u3066\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u53d6\u5f97\u3057\u3001DefaultValue\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u4ed8\u3044\u305f\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u691c\u51fa\u3057\u307e\u3059\u3002 \u305d\u3057\u3066\u53cd\u5c04\u3092\u4f7f\u3063\u3066\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u6307\u5b9a\u3055\u308c\u305f\u5024\u3092\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>\u30c7\u30d5\u30a9\u30eb\u30c8\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u5b9a\u7fa9\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.lang.annotation.*;\r\n<span class=\"hljs-meta\">@Retention(RetentionPolicy.RUNTIME)<\/span>\r\n<span class=\"hljs-meta\">@Target(ElementType.FIELD)<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-meta\">@interface<\/span> DefaultValue {\r\nString <span class=\"hljs-title function_\">value<\/span><span class=\"hljs-params\">()<\/span> <span class=\"hljs-keyword\">default<\/span> <span class=\"hljs-string\">\"\"<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306b@DefaultValue(&#8220;\u30c7\u30d5\u30a9\u30eb\u30c8\u5024&#8221;)\u3092\u8ffd\u52a0\u3059\u308b\u3060\u3051\u3067\u3001\u3053\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u306e\u4f7f\u7528\u6cd5\uff1a<\/p>\n<pre class=\"post-pre\"><code><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\">Entity<\/span> <span class=\"hljs-variable\">entity<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Entity<\/span>();\r\nSystem.out.println(entity.getName());  <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\uff1aJohn<\/span>\r\nSystem.out.println(entity.getAge());  <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\uff1a25<\/span>\r\n}\r\n<\/code><\/pre>\n<p>\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u305f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306e\u65e2\u5b9a\u5024\u306e\u8a2d\u5b9a\u65b9\u6cd5\u3067\u3059\u3002\u304a\u5f79\u306b\u7acb\u3066\u308c\u3070\u5e78\u3044\u3067\u3059\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3059. \u4ee5\u4e0b\u306f\u305d\u306e\u4f8b\u3067\u3059 public class Entity { @DefaultValue(&#8220;John&#8221;) private String [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-134393","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\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\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\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30af\u30e9\u30b9\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\u3059\/\" 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