{"id":31085,"date":"2023-11-30T05:51:52","date_gmt":"2023-01-22T13:32:14","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e3%80%91%e6%b3%a8%e8%a7%a3\/"},"modified":"2025-08-12T22:14:55","modified_gmt":"2025-08-12T14:14:55","slug":"%e3%80%90java%e3%80%91%e6%b3%a8%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e3%80%91%e6%b3%a8%e8%a7%a3\/","title":{"rendered":"\u3010Java\u3011\u6ce8\u89e3"},"content":{"rendered":"<h1>\u6ce8\u91ca<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30af\u30e9\u30b9\u30fb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306a\u3069\u306e\u578b\u3001\u30e1\u30f3\u30d0\u30fc\u306b\u4ed8\u4e0e\u3067\u304d\u308b\u30de\u30fc\u30af<\/ul>\n<\/li>\n<\/ul>\n<p>\u30a2\u30d7\u30ea\u672c\u6765\u306e\u30ed\u30b8\u30c3\u30af\u3068\u306f\u76f4\u63a5\u95a2\u4fc2\u3057\u306a\u3044\u4ed8\u968f\u60c5\u5831\u3092\u30b3\u30fc\u30c9\u306b\u8ffd\u52a0\u3067\u304d\u308b<br \/>\n\u5bfe\u8c61\u3068\u306a\u308b\u5ba3\u8a00\u306e\u5148\u982d\u306b\u8a18\u8ff0<\/p>\n<h2>&#8220;@Override&#8221;\u7528\u4e8eJava\u4e2d\u7684\u65b9\u6cd5\uff0c\u8868\u793a\u6b64\u65b9\u6cd5\u662f\u4ece\u5176\u7236\u7c7b\u7ee7\u627f\u5e76\u8fdb\u884c\u4e86\u91cd\u5199\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u63d0\u4f9b\u3055\u308c\u308b\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5bfe\u8c61\u30e1\u30bd\u30c3\u30c9\u304c\u57fa\u5e95\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u5ba3\u8a00<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5f15\u6570\u306e\u30df\u30b9\u3067\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3067\u304d\u3066\u306a\u3044\u6642\u3082\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u8b66\u544a\u3057\u3066\u304f\u308c\u308b<\/ul>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Person<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">firstName<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">lastName<\/span><span class=\"o\">;<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"nf\">Person<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">firstName<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">lastName<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">firstName<\/span> <span class=\"o\">=<\/span> <span class=\"n\">firstName<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">lastName<\/span> <span class=\"o\">=<\/span> <span class=\"n\">lastName<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"o\">}<\/span>\r\n\r\n  <span class=\"nd\">@Override<\/span>\r\n  <span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">toString<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"nc\">String<\/span><span class=\"o\">.<\/span><span class=\"na\">format<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u540d\u524d\u306f\u3001%s %s \u3067\u3059\u3002\"<\/span><span class=\"o\">,<\/span>\r\n        <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">lastName<\/span><span class=\"o\">,<\/span> <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">firstName<\/span><span class=\"o\">);<\/span>\r\n  <span class=\"o\">}<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">getLastName<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">lastName<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"o\">}<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">getFirstName<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">firstName<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>@WebServlet\u6ce8\u89e3<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u3068\u306f\u30b5\u30fc\u30d0\u30fc\u74b0\u5883\u3067Java\u30a2\u30d7\u30ea\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306e\u57fa\u672c\u6280\u8853\u306e\u4e00\u7a2e<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u306e\u57fa\u672c\u7684\u306a\u69cb\u6210\u60c5\u5831<\/ul>\n<\/li>\n<\/ul>\n<p>urlPatterns\uff1a\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u3092\u547c\u3076\u305f\u3081\u306eURL<\/p>\n<p>initParams\uff1a\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u3067\u5229\u7528\u3067\u304d\u308b\u30d1\u30e9\u30e1\u30fc\u30bf\u60c5\u5831<\/p>\n<h2>\u6ce8\u91ca\u7684\u91cd\u70b9<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u5165\u308c\u5b50\u304c\u53ef\u80fd<\/ul>\n<\/li>\n<\/ul>\n<p>\u8981\u7d201\u500b\u306a\u3089\u914d\u5217\u306e{&#8230;}\u7701\u7565\u53ef\u80fd<\/p>\n<p>urlPatterns = &#8220;\/init-param&#8221;<\/p>\n<p>\u5c5e\u6027\u540dvalues\u306f\u7701\u7565\u53ef\u80fd<\/p>\n<p>@WebServlet (values=&#8221;init-param&#8221;)<\/p>\n<p>@WebServlet (&#8220;init-param&#8221;)<\/p>\n<p>\u5c5e\u6027\u304c\u306a\u3044\u5834\u5408\u3001()\u7701\u7565\u53ef\u80fd<\/p>\n<p>\u30de\u30fc\u30ab\u30fc\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\uff08@Override\u306a\u3069\uff09<\/p>\n<h1>\u6a19\u6e96\u8a3b\u91cb@Override\uff1a\u57fa\u5e95\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4e0a\u66f8\u304d\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u5ba3\u8a00<\/p>\n<p>@Deprecated\uff1a\u30af\u30e9\u30b9\u3084\u30e1\u30f3\u30d0\u30fc\u306a\u3069\u304c\u975e\u63a8\u5968\u3067\u3042\u308b\u3053\u3068\u3092\u5ba3\u8a00<\/p>\n<p>@SuppressWarnings\uff1a\u30b3\u30f3\u30d1\u30a4\u30e9\u30fc\u8b66\u544a\u3092\u6291\u5236<\/p>\n<p>@SafeVarargs\uff1a\u53ef\u5909\u9577\u5f15\u6570\u306e\u578b\u5b89\u5168\u3092\u5ba3\u8a00<\/p>\n<p>@FunctionalInterface\uff1a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u3057\u3066\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3092\u5ba3\u8a00<\/p>\n<h2>@\u4e0d\u63a8\u8350\u4f7f\u7528\u7684<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30af\u30e9\u30b9\u3001\u30e1\u30bd\u30c3\u30c9\u306a\u3069\u304c\u975e\u63a8\u5968\u3067\u3042\u308b\u3053\u3068\u3092\u5ba3\u8a00<\/ul>\n<\/li>\n<\/ul>\n<p>Integer\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306fJava9\u4ee5\u964d\u3067\u975e\u63a8\u5968\uff08since=&#8221;9&#8243;\uff09<\/p>\n<p>\u30c9\u30ad\u30e5\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u3082\u8a18\u8ff0<\/p>\n<p>\u30b3\u30f3\u30d1\u30a4\u30eb\u306f\u901a\u308b\u304c\u8b66\u544a\u304c\u3067\u308b<\/p>\n<pre class=\"post-pre\"><code><span class=\"cm\">\/**\r\n * \u4e2d\u7565\r\n * @deprecated\r\n * It is rarely appropriate to use this constructor. The static factory\r\n * {@link #valueOf(int)} is generally a better choice, as it is\r\n * likely to yield significantly better space and time performance.\r\n *\/<\/span>\r\n\r\n<span class=\"nd\">@Deprecated<\/span><span class=\"o\">(<\/span><span class=\"n\">since<\/span><span class=\"o\">=<\/span><span class=\"s\">\"9\"<\/span><span class=\"o\">)<\/span>\r\n<span class=\"kd\">public<\/span> <span class=\"nf\">Integer<\/span><span class=\"o\">(<\/span><span class=\"kt\">int<\/span> <span class=\"n\">value<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">value<\/span> <span class=\"o\">=<\/span> <span class=\"n\">value<\/span><span class=\"o\">;<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<\/code><\/pre>\n<h2>@\u6291\u5236\u8b66\u544a<br \/>\n\u7279\u5b9a\u7bc4\u56f2\/\u7a2e\u985e\u306e\u30b3\u30f3\u30d1\u30a4\u30e9\u30fc\u8b66\u544a\u3092\u975e\u8868\u793a<\/p>\n<p>\u4ed6\u306e\u672c\u6765\u78ba\u8a8d\u3059\u3079\u304d\u8b66\u544a\u306e\u898b\u843d\u3068\u3057\u3092\u9632\u3052\u308b<br \/>\n\u610f\u56f3\u3057\u3066\u8b66\u544a\u5bfe\u8c61\u306e\u30b3\u30fc\u30c9\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u3068\u3044\u3046\u610f\u601d\u8868\u793a<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">AnnotationBasic<\/span> <span class=\"o\">{<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"nc\">Integer<\/span> <span class=\"nf\">process<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n   <span class=\"nd\">@SuppressWarnings<\/span><span class=\"o\">(<\/span><span class=\"s\">\"deprecation\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"kt\">var<\/span> <span class=\"n\">i<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Integer<\/span><span class=\"o\">(<\/span><span class=\"mi\">108<\/span><span class=\"o\">);<\/span>\r\n   <span class=\"k\">return<\/span> <span class=\"n\">i<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"o\">}<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">process<\/span><span class=\"o\">());<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>@SafeVarargs\u53ef\u5909\u9577\u5f15\u6570\u306e\u578b\u5b89\u5168\u3092\u5ba3\u8a00\u3057\u3001\u8b66\u544a\u304c\u8868\u793a\u3055\u308c\u306a\u3044<\/p>\n<p>\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u578b\u3092\u53ef\u5909\u9577\u5f15\u6570\u3068\u3059\u308b\u3068\u8b66\u544a\u304c\u51fa\u308b<\/p>\n<p>\u3042\u304f\u307e\u3067\u3082\u578b\u5b89\u5168\u3067\u3042\u308b\u3053\u3068\u3092\u958b\u767a\u8005\u304c\u8a8d\u8b58\u3057\u3066\u308b\u3068\u3044\u3046\u5ba3\u8a00<\/p>\n<h1>\u81ea\u5df1\u505a\u7684\u6ce8\u91ca<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u4fee\u98fe\u5b50\u3068\u9055\u3063\u3066\u81ea\u4f5c\u3067\u304d\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f@interface\u547d\u4ee4\u3067\u5b9a\u7fa9<\/ul>\n<\/li>\n<\/ul>\n<p>@interface\u914d\u4e0b\u3067\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u5229\u7528\u3067\u304d\u308b\u5c5e\u6027\u3092\u5ba3\u8a00<\/p>\n<p>\u4ee5\u4e0b\u306e@ClassInfo\u3067\u306f\u30d0\u30fc\u30b8\u30e7\u30f3\u5c5e\u6027\u3092version\u5c5e\u6027\u3001value\u5c5e\u6027\u3067\u6307\u5b9a\u3059\u308b<\/p>\n<p>@ClassInfo(version=&#8221;2.1&#8243;, description=&#8221;\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u30c6\u30b9\u30c8&#8221;)<br \/>\n@ClassInfo(version=&#8221;2.1&#8243;)<\/p>\n<p>\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u69cb\u6210\u60c5\u5831\u5ba3\u8a00\u3059\u308b\u30e1\u30bf\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u8a18\u8ff0<\/p>\n<p>@Documented\uff1ajavadoc\u306b\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u60c5\u5831\u53cd\u6620<\/p>\n<p>@Target\uff1a\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u3069\u306e\u8981\u7d20\u306b\u9069\u7528\u3059\u308b\u304b\u6c7a\u3081\u308b<\/p>\n<p>@Inherited\uff1a\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u6d3e\u751f\u30af\u30e9\u30b9\u306b\u3082\u7d99\u627f<\/p>\n<p>@Retention\uff1a\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u60c5\u5831\u3092\u3069\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u307e\u3067\u4fdd\u6301\u3059\u308b\u304b<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.lang.annotation.Documented<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.lang.annotation.ElementType<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.lang.annotation.Retention<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.lang.annotation.RetentionPolicy<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.lang.annotation.Target<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"c1\">\/\/\u69cb\u6210\u60c5\u5831\u5ba3\u8a00<\/span>\r\n<span class=\"nd\">@Documented<\/span>\r\n<span class=\"nd\">@Retention<\/span><span class=\"o\">(<\/span><span class=\"nc\">RetentionPolicy<\/span><span class=\"o\">.<\/span><span class=\"na\">RUNTIME<\/span><span class=\"o\">)<\/span>\r\n<span class=\"nd\">@Target<\/span><span class=\"o\">(<\/span><span class=\"nc\">ElementType<\/span><span class=\"o\">.<\/span><span class=\"na\">TYPE<\/span><span class=\"o\">)<\/span>\r\n<span class=\"c1\">\/\/@interface\u547d\u4ee4\u3067\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u5b9a\u7fa9<\/span>\r\n<span class=\"kd\">public<\/span> <span class=\"nd\">@interface<\/span> <span class=\"nc\">ClassInfo<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"c1\">\/\/\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u5229\u7528\u3067\u304d\u308b\u5c5e\u6027\u3092\u5ba3\u8a00<\/span>\r\n  <span class=\"nc\">String<\/span> <span class=\"nf\">value<\/span><span class=\"o\">()<\/span> <span class=\"k\">default<\/span> <span class=\"s\">\"\"<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"nc\">String<\/span> <span class=\"nf\">version<\/span><span class=\"o\">()<\/span> <span class=\"k\">default<\/span> <span class=\"s\">\"\"<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"nc\">String<\/span> <span class=\"nf\">description<\/span><span class=\"o\">()<\/span> <span class=\"k\">default<\/span> <span class=\"s\">\"\"<\/span><span class=\"o\">;<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h1>\u5728\u53cd\u601d\u4e2d\u4f7f\u7528\u6279\u6ce8<br \/>\n\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\uff08Reflection\uff09\uff1a\u30b3\u30fc\u30c9\u306e\u5b9f\u884c\u4e2d\u306b\u578b\u60c5\u5831\u53d6\u5f97\u3001\u64cd\u4f5c\u3059\u308b<br \/>\n\u4ee5\u4e0b\u3067\u306fClass.forName\u30e1\u30bd\u30c3\u30c9\u3067\u6307\u5b9a\u3057\u305f\u578b\u60c5\u5831\u3092Class\u30af\u30e9\u30b9\u3067\u53d6\u5f97<br \/>\n\u30de\u30fc\u30ab\u30fc\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\uff1a\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u4fdd\u6301\u3059\u308b\u60c5\u5831\uff08\u5c5e\u6027\uff09\u3067\u306f\u306a\u304f\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u5b58\u5728\u305d\u306e\u3082\u306e\u306b\u95a2\u5fc3\u304c\u3042\u308b<\/p>\n<p>isAnnotationPresent\u30e1\u30bd\u30c3\u30c9\u3067\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u6709\u7121\u78ba\u8a8d<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">mypackage<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"c1\">\/\/ClassInfo\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u6307\u5b9a<\/span>\r\n<span class=\"nd\">@ClassInfo<\/span><span class=\"o\">(<\/span><span class=\"n\">version<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"2.1\"<\/span><span class=\"o\">,<\/span> <span class=\"n\">description<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u52d5\u4f5c\u30c6\u30b9\u30c8\"<\/span><span class=\"o\">)<\/span>\r\n<span class=\"c1\">\/\/ @ClassInfo(\"2.1\")<\/span>\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">AnnotationClient<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"kd\">throws<\/span> <span class=\"nc\">ClassNotFoundException<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"c1\">\/\/Class\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u7d4c\u7531\u3057\u3066\u914d\u4e0b\u306e\u30e1\u30f3\u30d0\u30fc\u53d6\u5f97<\/span>\r\n    <span class=\"kt\">var<\/span> <span class=\"n\">clazz<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Class<\/span><span class=\"o\">.<\/span><span class=\"na\">forName<\/span><span class=\"o\">(<\/span><span class=\"s\">\"mypackage.AnnotationClient\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"c1\">\/\/getAnnotation\u30e1\u30bd\u30c3\u30c9\u3067\u30af\u30e9\u30b9\u306b\u4ed8\u4e0e\u3055\u308c\u305f\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u53d6\u5f97<\/span>\r\n    <span class=\"kt\">var<\/span> <span class=\"n\">info<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"nc\">ClassInfo<\/span><span class=\"o\">)<\/span>\r\n <span class=\"n\">clazz<\/span><span class=\"o\">.<\/span><span class=\"na\">getAnnotation<\/span><span class=\"o\">(<\/span><span class=\"nc\">ClassInfo<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u30d0\u30fc\u30b8\u30e7\u30f3\uff1a\"<\/span> <span class=\"o\">+<\/span>\r\n        <span class=\"o\">(<\/span><span class=\"n\">info<\/span><span class=\"o\">.<\/span><span class=\"na\">value<\/span><span class=\"o\">().<\/span><span class=\"na\">equals<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\"<\/span><span class=\"o\">)<\/span> <span class=\"o\">?<\/span> <span class=\"n\">info<\/span><span class=\"o\">.<\/span><span class=\"na\">version<\/span><span class=\"o\">()<\/span> <span class=\"o\">:<\/span> <span class=\"n\">info<\/span><span class=\"o\">.<\/span><span class=\"na\">value<\/span><span class=\"o\">()));<\/span>\r\n    <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u8aac\u660e\uff1a\"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">info<\/span><span class=\"o\">.<\/span><span class=\"na\">description<\/span><span class=\"o\">());<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h1>\u53cd\u5c04\u65b9\u6cd5<\/p>\n<h2>\u5bf9\u8c61\u521b\u5efa<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u7d4c\u7531\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210<\/ul>\n<\/li>\n<\/ul>\n<p>\u547c\u3073\u51fa\u3059\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092Class\u30af\u30e9\u30b9\u306egetConstructor\u30e1\u30bd\u30c3\u30c9\u3067\u751f\u6210<\/p>\n<p>newInstance\u30e1\u30bd\u30c3\u30c9\u3067\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210<\/p>\n<p>Array.newInstance\u30e1\u30bd\u30c3\u30c9\u3067\u914d\u5217\u751f\u6210<\/p>\n<p>set\u30e1\u30bd\u30c3\u30c9\u3067\u914d\u5217\u8981\u7d20\u8a2d\u5b9a<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.io.File<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.lang.reflect.Array<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.lang.reflect.InvocationTargetException<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.util.Arrays<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">ReflectInstance<\/span> <span class=\"o\">{<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"c1\">\/\/File\u30af\u30e9\u30b9\u53d6\u5f97<\/span>\r\n      <span class=\"kt\">var<\/span> <span class=\"n\">clazz<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">File<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">;<\/span>\r\n\r\n      <span class=\"c1\">\/\/\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u7d4c\u7531\u3067File\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210<\/span>\r\n      <span class=\"kt\">var<\/span> <span class=\"n\">c<\/span> <span class=\"o\">=<\/span> <span class=\"n\">clazz<\/span><span class=\"o\">.<\/span><span class=\"na\">getConstructor<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"kt\">var<\/span> <span class=\"n\">fl<\/span> <span class=\"o\">=<\/span> <span class=\"n\">c<\/span><span class=\"o\">.<\/span><span class=\"na\">newInstance<\/span><span class=\"o\">(<\/span><span class=\"s\">\".\/data\/data.txt\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">fl<\/span><span class=\"o\">);<\/span>\r\n\r\n      <span class=\"c1\">\/\/\u30b5\u30a4\u30ba2\u306e\u914d\u5217\u751f\u6210<\/span>\r\n      <span class=\"kt\">var<\/span> <span class=\"n\">list<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"nc\">File<\/span><span class=\"o\">[])<\/span> <span class=\"nc\">Array<\/span><span class=\"o\">.<\/span><span class=\"na\">newInstance<\/span><span class=\"o\">(<\/span><span class=\"nc\">File<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">,<\/span> <span class=\"mi\">2<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"nc\">Array<\/span><span class=\"o\">.<\/span><span class=\"na\">set<\/span><span class=\"o\">(<\/span><span class=\"n\">list<\/span><span class=\"o\">,<\/span> <span class=\"mi\">0<\/span><span class=\"o\">,<\/span> <span class=\"n\">fl<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"nc\">Arrays<\/span><span class=\"o\">.<\/span><span class=\"na\">toString<\/span><span class=\"o\">(<\/span><span class=\"n\">list<\/span><span class=\"o\">));<\/span>\r\n    <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">InstantiationException<\/span> <span class=\"o\">|<\/span> <span class=\"nc\">IllegalAccessException<\/span> <span class=\"o\">|<\/span>\r\n        <span class=\"nc\">IllegalArgumentException<\/span> <span class=\"o\">|<\/span> <span class=\"nc\">InvocationTargetException<\/span>\r\n        <span class=\"o\">|<\/span> <span class=\"nc\">NoSuchMethodException<\/span> <span class=\"o\">|<\/span> <span class=\"nc\">SecurityException<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u83b7\u53d6\u6240\u6709\u65b9\u6cd5<br \/>\ngetMethods\u30e1\u30bd\u30c3\u30c9\u3067File\u30af\u30e9\u30b9\u306ePublic\u30e1\u30bd\u30c3\u30c9\u5217\u6319<\/p>\n<p>public\u30e1\u30bd\u30c3\u30c9\u3092Method\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u914d\u5217\u3068\u3057\u3066\u8fd4\u3059<\/p>\n<p>public\u4ee5\u5916\u3082\u53d6\u308a\u305f\u3044\u3068\u304d\u306fgetDeclaredMethods\u30e1\u30bd\u30c3\u30c9\u3067\u5168\u30e1\u30bd\u30c3\u30c9\u53d6\u5f97<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.io.File<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">ReflectMethods<\/span> <span class=\"o\">{<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"c1\">\/\/File\u30af\u30e9\u30b9\u53d6\u5f97<\/span>\r\n    <span class=\"kt\">var<\/span> <span class=\"n\">str<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">File<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"c1\">\/\/File\u30af\u30e9\u30b9\u914d\u4e0b\u306epublic\u30e1\u30bd\u30c3\u30c9\u3092getName\u3067\u30e1\u30bd\u30c3\u30c9\u540d\u5217\u6319<\/span>\r\n    <span class=\"k\">for<\/span> <span class=\"o\">(<\/span><span class=\"kt\">var<\/span> <span class=\"n\">m<\/span> <span class=\"o\">:<\/span> <span class=\"n\">str<\/span><span class=\"o\">.<\/span><span class=\"na\">getMethods<\/span><span class=\"o\">())<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">m<\/span><span class=\"o\">.<\/span><span class=\"na\">getName<\/span><span class=\"o\">());<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u6267\u884c\u65b9\u6cd5<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Method\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4ecb\u3057\u3066\u5b9f\u884c<\/ul>\n<\/li>\n<\/ul>\n<p>getMethod\u30e1\u30bd\u30c3\u30c9\u3067\u500b\u5225\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u53d6\u5f97\u3057\u3001invoke\u30e1\u30bd\u30c3\u30c9\u3067\u5b9f\u884c<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.io.File<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.lang.reflect.InvocationTargetException<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.lang.reflect.Method<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">ReflectInvoke<\/span> <span class=\"o\">{<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"c1\">\/\/File\u30af\u30e9\u30b9\u53d6\u5f97<\/span>\r\n      <span class=\"kt\">var<\/span> <span class=\"n\">clazz<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">File<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">;<\/span>\r\n      <span class=\"c1\">\/\/File\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210<\/span>\r\n      <span class=\"kt\">var<\/span> <span class=\"n\">f1<\/span> <span class=\"o\">=<\/span> <span class=\"n\">clazz<\/span><span class=\"o\">.<\/span><span class=\"na\">getConstructor<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">).<\/span><span class=\"na\">newInstance<\/span><span class=\"o\">(<\/span><span class=\"s\">\".\/data\/data.txt\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"kt\">var<\/span> <span class=\"n\">f2<\/span> <span class=\"o\">=<\/span> <span class=\"n\">clazz<\/span><span class=\"o\">.<\/span><span class=\"na\">getConstructor<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">).<\/span><span class=\"na\">newInstance<\/span><span class=\"o\">(<\/span><span class=\"s\">\".\/data\/sample.txt\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"c1\">\/\/renameTo\u30e1\u30bd\u30c3\u30c9\u53d6\u5f97\u3001\u5b9f\u884c<\/span>\r\n      <span class=\"nc\">Method<\/span> <span class=\"n\">m<\/span> <span class=\"o\">=<\/span> <span class=\"n\">clazz<\/span><span class=\"o\">.<\/span><span class=\"na\">getMethod<\/span><span class=\"o\">(<\/span><span class=\"s\">\"renameTo\"<\/span><span class=\"o\">,<\/span> <span class=\"nc\">File<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">m<\/span><span class=\"o\">.<\/span><span class=\"na\">invoke<\/span><span class=\"o\">(<\/span><span class=\"n\">f1<\/span><span class=\"o\">,<\/span> <span class=\"n\">f2<\/span><span class=\"o\">));<\/span>\r\n    <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">NoSuchMethodException<\/span> <span class=\"o\">|<\/span> <span class=\"nc\">SecurityException<\/span> <span class=\"o\">|<\/span>\r\n        <span class=\"nc\">InstantiationException<\/span> <span class=\"o\">|<\/span> <span class=\"nc\">IllegalAccessException<\/span>\r\n        <span class=\"o\">|<\/span> <span class=\"nc\">IllegalArgumentException<\/span> <span class=\"o\">|<\/span> <span class=\"nc\">InvocationTargetException<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u83b7\u53d6\u548c\u8bbe\u7f6e\u5b57\u6bb5<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">public\u30d5\u30a3\u30fc\u30eb\u30c9\u306fgetField\u30e1\u30bd\u30c3\u30c9\u3067\u53d6\u5f97<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u305d\u306e\u4ed6\u30d5\u30a3\u30fc\u30eb\u30c9\u306fgetDeclaredFiled\u30e1\u30bd\u30c3\u30c9\u3067\u53d6\u5f97<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5f15\u6570\u306f\u53d6\u5f97\u3057\u305f\u3044\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u540d\u524d\u3092\u6307\u5b9a<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Field\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u53d6\u5f97\u3057\u305f\u3089get\/set\u30e1\u30bd\u30c3\u30c9\u3067\u30d5\u30a3\u30fc\u30eb\u30c9\u5024\u3092\u53d6\u5f97\/\u8a2d\u5b9a<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">private\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u305d\u306e\u307e\u307e\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u306e\u3067\u3001setAccessible\u30e1\u30bd\u30c3\u30c9\u3067\u30a2\u30af\u30bb\u30b9\u3092\u660e\u793a\u7684\u306b\u8a31\u53ef<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u6ce8\u610f\uff1a\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u306f\u4f4e\u901f<\/ul>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/Person\u30af\u30e9\u30b9\u306elastName\u30d5\u30a3\u30fc\u30eb\u30c9\u53d6\u5f97<\/span>\r\n\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.lang.reflect.InvocationTargetException<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">example.Person<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">ReflectField<\/span> <span class=\"o\">{<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"kt\">var<\/span> <span class=\"n\">clazz<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Person<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">;<\/span>\r\n      <span class=\"kt\">var<\/span> <span class=\"n\">con<\/span> <span class=\"o\">=<\/span> <span class=\"n\">clazz<\/span><span class=\"o\">.<\/span><span class=\"na\">getConstructor<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"kt\">var<\/span> <span class=\"n\">p<\/span> <span class=\"o\">=<\/span> <span class=\"n\">con<\/span><span class=\"o\">.<\/span><span class=\"na\">newInstance<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u592a\u90ce\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"\u5c71\u7530\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"c1\">\/\/\u30d5\u30a3\u30fc\u30eb\u30c9\u53d6\u5f97<\/span>\r\n      <span class=\"kt\">var<\/span> <span class=\"n\">last<\/span> <span class=\"o\">=<\/span> <span class=\"n\">clazz<\/span><span class=\"o\">.<\/span><span class=\"na\">getDeclaredField<\/span><span class=\"o\">(<\/span><span class=\"s\">\"lastName\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"c1\">\/\/private\u30d5\u30a3\u30fc\u30eb\u30c9\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u660e\u793a\u7684\u306b\u8a31\u53ef<\/span>\r\n      <span class=\"n\">last<\/span><span class=\"o\">.<\/span><span class=\"na\">setAccessible<\/span><span class=\"o\">(<\/span><span class=\"kc\">true<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"c1\">\/\/get\/set\u30e1\u30bd\u30c3\u30c9\u3067\u30d5\u30a3\u30fc\u30eb\u30c9\u5024\u53d6\u5f97\/\u8a2d\u5b9a<\/span>\r\n      <span class=\"n\">last<\/span><span class=\"o\">.<\/span><span class=\"na\">set<\/span><span class=\"o\">(<\/span><span class=\"n\">p<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"\u9234\u6728\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">last<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"n\">p<\/span><span class=\"o\">));<\/span> <span class=\"c1\">\/\/\u9234\u6728<\/span>\r\n    <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">NoSuchMethodException<\/span> <span class=\"o\">|<\/span> <span class=\"nc\">SecurityException<\/span> <span class=\"o\">|<\/span>\r\n        <span class=\"nc\">InstantiationException<\/span> <span class=\"o\">|<\/span> <span class=\"nc\">IllegalAccessException<\/span>\r\n        <span class=\"o\">|<\/span> <span class=\"nc\">IllegalArgumentException<\/span> <span class=\"o\">|<\/span> <span class=\"nc\">InvocationTargetException<\/span> <span class=\"o\">|<\/span>\r\n        <span class=\"nc\">NoSuchFieldException<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">example<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Person<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">firstName<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">lastName<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"kd\">public<\/span> <span class=\"nf\">Person<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">firstName<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">lastName<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">firstName<\/span> <span class=\"o\">=<\/span> <span class=\"n\">firstName<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">lastName<\/span> <span class=\"o\">=<\/span> <span class=\"n\">lastName<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"o\">}<\/span>\r\n  <span class=\"nd\">@Override<\/span>\r\n  <span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">toString<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"nc\">String<\/span><span class=\"o\">.<\/span><span class=\"na\">format<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u540d\u524d\u306f\u3001%s %s \u3067\u3059\u3002\"<\/span><span class=\"o\">,<\/span>\r\n        <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">lastName<\/span><span class=\"o\">,<\/span> <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">firstName<\/span><span class=\"o\">);<\/span>\r\n  <span class=\"o\">}<\/span>\r\n  <span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">getLastName<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">lastName<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"o\">}<\/span>\r\n  <span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">getFirstName<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">firstName<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u6ce8\u91ca \u30af\u30e9\u30b9\u30fb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306a\u3069\u306e\u578b\u3001\u30e1\u30f3\u30d0\u30fc\u306b\u4ed8\u4e0e\u3067\u304d\u308b\u30de\u30fc\u30af \u30a2\u30d7\u30ea\u672c\u6765\u306e\u30ed\u30b8\u30c3\u30af\u3068\u306f\u76f4\u63a5\u95a2\u4fc2\u3057\u306a\u3044\u4ed8\u968f [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31085","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"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>\u3010Java\u3011\u6ce8\u89e3 - Blog - Silicon 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content=\"2025-08-12T14:14:55+00:00\" \/>\n<meta name=\"author\" content=\"\u97f5, \u79d1\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u97f5, \u79d1\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e3%80%91%e6%b3%a8%e8%a7%a3\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e3%80%91%e6%b3%a8%e8%a7%a3\/\",\"name\":\"\u3010Java\u3011\u6ce8\u89e3 - Blog - Silicon 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