{"id":121158,"date":"2024-03-24T01:29:02","date_gmt":"2024-03-23T16:29:02","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%ab%e5%8b%95%e7%9a%84%e3%81%ab%e3%83%97%e3%83%ad%e3%83%91%e3%83%86%e3%82%a3%e3%82%92%e8%bf%bd%e5%8a%a0%e3%81%99%e3%82%8b%e6%96%b9\/"},"modified":"2024-04-04T11:03:28","modified_gmt":"2024-04-04T02:03:28","slug":"java-%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%ab%e5%8b%95%e7%9a%84%e3%81%ab%e3%83%97%e3%83%ad%e3%83%91%e3%83%86%e3%82%a3%e3%82%92%e8%bf%bd%e5%8a%a0%e3%81%99%e3%82%8b%e6%96%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%ab%e5%8b%95%e7%9a%84%e3%81%ab%e3%83%97%e3%83%ad%e3%83%91%e3%83%86%e3%82%a3%e3%82%92%e8%bf%bd%e5%8a%a0%e3%81%99%e3%82%8b%e6%96%b9\/","title":{"rendered":"Java \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u52d5\u7684\u306b\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8ffd\u52a0\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b?"},"content":{"rendered":"<p>Java\u3067\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u901a\u5e38\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u78ba\u5b9a\u3057\u3066\u304a\u308a\u3001\u5b9f\u884c\u6642\u306b\u52d5\u7684\u306b\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u304c\u3001Java\u306e\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u6a5f\u80fd\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u52d5\u7684\u30d7\u30ed\u30d1\u30c6\u30a3\u8ffd\u52a0\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u3001\u56fa\u5b9a\u3055\u308c\u305f\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u308b\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u304b\u3001\u65e2\u5b58\u306e\u30af\u30e9\u30b9\u3092\u30d9\u30fc\u30b9\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u6b21\u306b\u3001Java \u306e\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u30e1\u30ab\u30cb\u30ba\u30e0\u306e Field \u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u52d5\u7684\u306b\u8ffd\u52a0\u3059\u308b\u3002<\/p>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306f\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.lang.reflect.Field;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">DynamicAttributeExample<\/span> {\r\n<span class=\"hljs-keyword\">private<\/span> String name;\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-keyword\">void<\/span> <span class=\"hljs-title function_\">setName<\/span><span class=\"hljs-params\">(String name)<\/span> {\r\n<span class=\"hljs-built_in\">this<\/span>.name = name;\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> <span class=\"hljs-keyword\">throws<\/span> NoSuchFieldException, IllegalAccessException {\r\n<span class=\"hljs-comment\">\/\/ \u521b\u5efa\u5bf9\u8c61<\/span>\r\n<span class=\"hljs-type\">DynamicAttributeExample<\/span> <span class=\"hljs-variable\">example<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">DynamicAttributeExample<\/span>();\r\nexample.setName(<span class=\"hljs-string\">\"John\"<\/span>);\r\n<span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u5bf9\u8c61\u7684Class\u5bf9\u8c61<\/span>\r\nClass&lt;?&gt; clazz = example.getClass();\r\n<span class=\"hljs-comment\">\/\/ \u52a8\u6001\u589e\u52a0\u5c5e\u6027<\/span>\r\n<span class=\"hljs-type\">Field<\/span> <span class=\"hljs-variable\">field<\/span> <span class=\"hljs-operator\">=<\/span> clazz.getDeclaredField(<span class=\"hljs-string\">\"age\"<\/span>);\r\nfield.setAccessible(<span class=\"hljs-literal\">true<\/span>);\r\nfield.set(example, <span class=\"hljs-number\">30<\/span>);\r\n<span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u52a8\u6001\u589e\u52a0\u7684\u5c5e\u6027<\/span>\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">age<\/span> <span class=\"hljs-operator\">=<\/span> (<span class=\"hljs-type\">int<\/span>) field.get(example);\r\nSystem.out.println(<span class=\"hljs-string\">\"name: \"<\/span> + example.getName());\r\nSystem.out.println(<span class=\"hljs-string\">\"age: \"<\/span> + age);\r\n}\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u306e\u4f8b\u3067\u306f\u3001\u6700\u521d\u306bDynamicAttributeExample\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3057\u3001name\u5c5e\u6027\u306e\u5024\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u6b21\u306b\u3001getClass()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306eClass\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002\u3055\u3089\u306b\u3001getDeclaredField()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u305d\u306e\u5c5e\u6027\u306eField\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3057\u3001setAccessible()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001set()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u5c5e\u6027\u306e\u5024\u3092\u52d5\u7684\u306b\u8a2d\u5b9a\u3057\u3001get()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u52d5\u7684\u306b\u8ffd\u52a0\u3057\u305f\u5c5e\u6027\u306e\u5024\u3092\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u52d5\u7684\u3067\u5c5e\u6027\u3092\u8ffd\u52a0\u3059\u308b\u305f\u3081\u306b\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30b3\u30fc\u30c9\u306e\u5224\u8aad\u6027\u3068\u4fdd\u5b88\u6027\u304c\u4f4e\u4e0b\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u5b9f\u969b\u306e\u958b\u767a\u3067\u306f\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u52d5\u7684\u306b\u5c5e\u6027\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u306f\u614e\u91cd\u306b\u884c\u3044\u3001Java\u306e\u9759\u7684\u578b\u8a00\u8a9e\u306e\u7279\u5fb4\u306b\u3067\u304d\u308b\u9650\u308a\u5f93\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u901a\u5e38\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u78ba\u5b9a\u3057\u3066\u304a\u308a\u3001\u5b9f\u884c\u6642\u306b\u52d5\u7684\u306b\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u304c\u3001Java\u306e\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u6a5f\u80fd\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u52d5\u7684\u30d7\u30ed\u30d1\u30c6\u30a3\u8ffd\u52a0\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002 \u307e\u305a\u3001\u56fa\u5b9a\u3055\u308c [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-121158","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 \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u52d5\u7684\u306b\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8ffd\u52a0\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b? - 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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