{"id":131902,"date":"2024-03-25T21:01:00","date_gmt":"2024-03-25T12:01:00","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%81%ae%e3%83%aa%e3%83%95%e3%83%ac%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3%e3%81%a8%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%81%ae-%e5%91%bc%e3%81%b3%e5%87%ba%e3%81%97%e3%83%a1%e3%82%bd%e3%83%83\/"},"modified":"2024-03-28T11:53:38","modified_gmt":"2024-03-28T02:53:38","slug":"java-%e3%81%ae%e3%83%aa%e3%83%95%e3%83%ac%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3%e3%81%a8%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%81%ae-%e5%91%bc%e3%81%b3%e5%87%ba%e3%81%97%e3%83%a1%e3%82%bd%e3%83%83","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%81%ae%e3%83%aa%e3%83%95%e3%83%ac%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3%e3%81%a8%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%81%ae-%e5%91%bc%e3%81%b3%e5%87%ba%e3%81%97%e3%83%a1%e3%82%bd%e3%83%83\/","title":{"rendered":"Java \u306e\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3068\u30e1\u30bd\u30c3\u30c9\u306e \u547c\u3073\u51fa\u3057\u30e1\u30bd\u30c3\u30c9"},"content":{"rendered":"<p>Java \u306e\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u306f\u3001\u5b9f\u884c\u6642\u306b\u52d5\u7684\u306b\u30af\u30e9\u30b9\u60c5\u5831\u3092\u53d6\u5f97\u3057\u3001\u30af\u30e9\u30b9\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3001\u30e1\u30bd\u30c3\u30c9\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306a\u3069\u3092\u64cd\u4f5c\u3059\u308b\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u5b9f\u884c\u6642\u306b\u52d5\u7684\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u305f\u308a\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u305f\u308a\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5024\u3092\u53d6\u5f97\u3057\u305f\u308a\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u5b9f\u884c\u6642\u306e\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u52d5\u7684\u306b\u52d5\u4f5c\u3092\u8abf\u6574\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>Java \u306e\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u6a5f\u80fd\u306f\u3001Class \u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30af\u30e9\u30b9\u60c5\u5831\u3092\u53d6\u5f97\u3057\u3001Method \u30af\u30e9\u30b9\u306f\u30e1\u30bd\u30c3\u30c9\u3092\u8868\u3057\u307e\u3059\u3002Method \u30af\u30e9\u30b9\u306b\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u305f\u3081\u306b invoke \u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002invoke \u30e1\u30bd\u30c3\u30c9\u306e\u30b7\u30b0\u30cd\u30c1\u30e3\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<p>public Object invoke(Object obj, Object&#8230; args) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException<\/p>\n<p>\u6307\u5b9a\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3001\u6307\u5b9a\u3055\u308c\u305f\u5f15\u6570\u3092\u30e1\u30bd\u30c3\u30c9\u306b\u6e21\u3059\u3053\u3068\u3092\u76ee\u7684\u3068\u3057\u3066\u3044\u307e\u3059\u3002obj\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u5143\u3067\u3042\u308a\u3001args\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3067\u3059\u3002<\/p>\n<p>\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.lang.reflect.Method;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">ReflectionExample<\/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> Exception {\r\n<span class=\"hljs-comment\">\/\/ \u83b7\u53d6Person\u7c7b\u7684Class\u5bf9\u8c61<\/span>\r\nClass&lt;?&gt; personClass = Class.forName(<span class=\"hljs-string\">\"com.example.Person\"<\/span>);\r\n<span class=\"hljs-comment\">\/\/ \u521b\u5efaPerson\u7c7b\u7684\u5b9e\u4f8b<\/span>\r\n<span class=\"hljs-type\">Object<\/span> <span class=\"hljs-variable\">personObj<\/span> <span class=\"hljs-operator\">=<\/span> personClass.newInstance();\r\n<span class=\"hljs-comment\">\/\/ \u83b7\u53d6setName\u65b9\u6cd5<\/span>\r\n<span class=\"hljs-type\">Method<\/span> <span class=\"hljs-variable\">setNameMethod<\/span> <span class=\"hljs-operator\">=<\/span> personClass.getMethod(<span class=\"hljs-string\">\"setName\"<\/span>, String.class);\r\n<span class=\"hljs-comment\">\/\/ \u8c03\u7528setName\u65b9\u6cd5<\/span>\r\nsetNameMethod.invoke(personObj, <span class=\"hljs-string\">\"John Doe\"<\/span>);\r\n<span class=\"hljs-comment\">\/\/ \u83b7\u53d6getName\u65b9\u6cd5<\/span>\r\n<span class=\"hljs-type\">Method<\/span> <span class=\"hljs-variable\">getNameMethod<\/span> <span class=\"hljs-operator\">=<\/span> personClass.getMethod(<span class=\"hljs-string\">\"getName\"<\/span>);\r\n<span class=\"hljs-comment\">\/\/ \u8c03\u7528getName\u65b9\u6cd5<\/span>\r\n<span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">name<\/span> <span class=\"hljs-operator\">=<\/span> (String) getNameMethod.invoke(personObj);\r\nSystem.out.println(<span class=\"hljs-string\">\"Name: \"<\/span> + name);\r\n}\r\n}\r\n<\/code><\/pre>\n<p>Person\u30af\u30e9\u30b9\u306eClass\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092Class.forName\u30e1\u30bd\u30c3\u30c9\u3067\u53d6\u5f97\u3057\u3001newInstance\u30e1\u30bd\u30c3\u30c9\u3067Person\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u3002\u3064\u3065\u3044\u3066setName\u3068getName\u30e1\u30bd\u30c3\u30c9\u306eMethod\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092getMethod\u30e1\u30bd\u30c3\u30c9\u3067\u53d6\u308a\u51fa\u3057\u3001invoke\u30e1\u30bd\u30c3\u30c9\u3067\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3002<\/p>\n<p>invoke\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306fObject\u578b\u306a\u306e\u3067\u3001\u578b\u5909\u63db\u304c\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001invoke\u30e1\u30bd\u30c3\u30c9\u306f\u3001IllegalAccessException\u3001IllegalArgumentException\u3001InvocationTargetException\u306a\u3069\u306e\u4f8b\u5916\u3092\u30b9\u30ed\u30fc\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u9069\u5207\u306a\u30a8\u30e9\u30fc\u51e6\u7406\u3092\u884c\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>Java\u306e\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u6a5f\u80fd\u3068Method\u30af\u30e9\u30b9\u306einvoke\u30e1\u30bd\u30c3\u30c9\u306e\u6982\u8981\u3068\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306b\u3064\u3044\u3066\u7c21\u5358\u306b\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u306e\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u306f\u3001\u5b9f\u884c\u6642\u306b\u52d5\u7684\u306b\u30af\u30e9\u30b9\u60c5\u5831\u3092\u53d6\u5f97\u3057\u3001\u30af\u30e9\u30b9\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3001\u30e1\u30bd\u30c3\u30c9\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306a\u3069\u3092\u64cd\u4f5c\u3059\u308b\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u5b9f\u884c\u6642\u306b\u52d5\u7684\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u305f\u308a\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073 [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-131902","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is 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\u306e\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u306f\u3001\u5b9f\u884c\u6642\u306b\u52d5\u7684\u306b\u30af\u30e9\u30b9\u60c5\u5831\u3092\u53d6\u5f97\u3057\u3001\u30af\u30e9\u30b9\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3001\u30e1\u30bd\u30c3\u30c9\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306a\u3069\u3092\u64cd\u4f5c\u3059\u308b\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u5b9f\u884c\u6642\u306b\u52d5\u7684\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u305f\u308a\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java-\u306e\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3068\u30e1\u30bd\u30c3\u30c9\u306e-\u547c\u3073\u51fa\u3057\u30e1\u30bd\u30c3\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" 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