1. \u4ec0\u4e48\u662f\u53cd\u5c04\uff1f<\/strong><\/div>\n
\u4ec0\u4e48\u662f\u53cd\u5c04\uff1f\u5728\u5b98\u65b9\u6587\u6863\u4e2d\u662f\u8fd9\u6837\u8bf4\u7684\uff1a
\n Reflection is commonly used by programs which require the ability to examine ormodify the runtime behavior of applications running in the Java virtual machine.
\nThis is a relatively advanced feature and should be used only by developers whohave a strong grasp of the fundamentals of the language.
\n With that caveat in mind, reflection is a powerful technique and can enable applications to perform operations which would otherwise be impossible<\/p>\n
\u7ffb\u8bd1\u4e00\u4e0b\uff1a<\/p>\n
\u53cd\u5c04\u6280\u672f\u901a\u5e38\u88ab\u7528\u6765\u68c0\u6d4b\u548c\u6539\u53d8\u5e94\u7528\u7a0b\u5e8f\u5728 Java \u865a\u62df\u673a\u4e2d\u7684\u884c\u4e3a\u8868\u73b0\u3002\u5b83\u662f\u4e00\u4e2a\u76f8\u5bf9\u800c\u8a00\u6bd4\u8f83\u9ad8\u7ea7\u7684\u6280\u672f\uff0c\u901a\u5e38\u5b83\u5e94\u7528\u7684\u524d\u63d0\u662f\u5f00\u53d1\u8005\u672c\u8eab\u5bf9\u4e8e Java \u8bed\u8a00\u7279\u6027\u6709\u5f88\u5f3a\u7684\u7406\u89e3\u7684\u57fa\u7840\u4e0a\u3002\u503c\u5f97\u8bf4\u660e\u7684\u662f\uff0c\u53cd\u5c04\u662f\u4e00\u79cd\u5f3a\u6709\u529b\u7684\u6280\u672f\u7279\u6027\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u5f97\u5e94\u7528\u7a0b\u5e8f\u6267\u884c\u4e00\u4e9b\u5e38\u89c4\u624b\u6bb5\u65e0\u6cd5\u4f01\u53ca\u7684\u76ee\u7684\u3002<\/p>\n
\u4e2a\u4eba\u7406\u89e3\uff1a\u53cd\u5c04\u662f\u4e00\u79cd\u5f88\u725bx\u7684\u6280\u672f\uff0c\u4f7f\u7528\u53cd\u5c04\u7684\u6761\u4ef6\u662f\u7a0b\u5e8f\u733f\u662f\u4e00\u4e2a\u5927\u733f\uff0c\u5bf9java\u7684\u7279\u6027\u975e\u5e38\u7406\u89e3\u3002\u53cd\u5c04\u7684\u725b\u903c\u4e4b\u5904\u5728\u4e8e\u4ed6\u53ef\u4ee5\u5b8c\u6210\u4e00\u4e9b\u975e\u5e38\u89c4\u64cd\u4f5c\u3002<\/p>\n
\u4e3e\u4e2a\u6817\u5b50\u6765\u8bf4\u660e\u4e00\u4e0b\uff1a<\/p>\n
\u7a0d\u5fae\u60f3\u4e86\u4e00\u4e0b\uff0c\u89c9\u5f97\u7528\u716e\u996d\u8fd9\u4e2a\u6817\u5b50\u6765\u8bf4\u660e\u5427\uff0c\u4e0d\u77e5\u9053\u51c6\u4e0d\u51c6\u786e\uff08^,^\uff09\u3002\u5e73\u65f6\u6211\u4eec\u5728\u5bb6\u91cc\u4e00\u822c\u662f\u7528\u7535\u996d\u7172\u6765\u716e\u996d\u7684\uff0c\u716e\u996d\u7684\u6b65\u9aa4\u4e00\u822c\u662f\uff1a\u6dd8\u7c73\u2014\u2014>\u64e6\u5e72\u9505\u5e95\u2014\u2014>\u628a\u9505\u653e\u5230\u7535\u996d\u7172\u91cc\u2014\u2014>\u5408\u4e0a\u76d6\u5b50\uff0c\u901a\u7535\uff0c\u7535\u996d\u7172\u5de5\u4f5c\u2014\u2014>\u996d\u716e\u719f\u4e86\uff0c\u53ef\u4ee5\u5403\u4e86\uff0c\u4f46\u73b0\u5728\u6709\u4e2a\u9700\u6c42\uff0c\u6211\u8981\u5728\u716e\u996d\u7684\u8fc7\u7a0b\u4e2d\u52a0\u4e2a\u9e21\u86cb\uff0c\u8fd9\u65f6\u600e\u4e48\u89e3\u51b3\u5462\uff1f\u662f\u4e0d\u662f\u6253\u5f00\u6b63\u5728\u901a\u7535\u716e\u996d\u7684\u7535\u996d\u7172\uff0c\u7136\u540e\u628a\u9e21\u86cb\u653e\u8fdb\u53bb\u5462\uff1f\uff08\u6765\u81ea\u5403\u8d27\u7684\u9700\u6c42^_^\uff09\u5176\u5b9e\u53cd\u5c04\u5c31\u76f8\u5f53\u4e8e\u521a\u624d\u52a0\u9e21\u86cb\u7684\u8fc7\u7a0b\u3002\u6240\u4ee5\u53cd\u5c04\u5f88\u725b\u903c\uff0c\u4ed6\u4e0d\u6309\u5e38\u89c4\u5957\u8def\u51fa\u724c\uff0c\u5728\u7a0b\u5e8f\u8fd0\u884c\u7684\u8fc7\u7a0b\u4e2d\u641e\u4e00\u4e9b\u5c0f\u52a8\u4f5c\uff0c\u4ee5\u8fbe\u5230\u201c\u5403\u8d27\u201d\u7684\u76ee\u7684\u3002\u8865\u5145\u4e00\u4e0b\uff1a\u201c\u6dd8\u7c73\u2014\u2014>\u64e6\u5e72\u9505\u5e95\u2014\u2014>\u628a\u9505\u653e\u5230\u7535\u996d\u7172\u91cc\u2014\u2014>\u201d\u8fd9\u4e2a\u8fc7\u7a0b\u53ef\u4ee5\u770b\u505a\u7f16\u7801\u7f16\u8bd1\u8fc7\u7a0b\uff0c\u201c\u2014\u2014>\u5408\u4e0a\u76d6\u5b50\uff0c\u901a\u7535\uff0c\u7535\u996d\u7172\u5de5\u4f5c\u201d\u53ef\u4ee5\u770b\u505a\u662f\u7a0b\u5e8f\u8fd0\u884c\u8fc7\u7a0b\uff0c\u201c\u2014\u2014>\u996d\u716e\u719f\u4e86\uff0c\u53ef\u4ee5\u5403\u4e86\u201d\u53ef\u4ee5\u770b\u505a\u7a0b\u5e8f\u8fd0\u884c\u7ed3\u675f\u3002
\n $\"\"$ <\/p>\n
2.java\u4e2d\u7684\u53cd\u5c04\u673a\u5236<\/strong><\/div>\n
2.1 \u53cd\u5c04\u4e2d\u5e38\u89c1\u7684\u7c7b<\/strong><\/span><\/div>\n
\u7406\u89e3\u53cd\u5c04\u673a\u5236\u65f6\uff0c\u9996\u5148\u719f\u6089\u4e00\u4e0b\u51e0\u4e2a\u7c7b\uff1a<\/p>\n
1\uff09Class\u7c7b<\/strong><\/p>\n
Class\u7c7b\u5b9e\u4f8b\u8868\u793a\u6b63\u5728\u8fd0\u884c\u7684Java\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684\u7c7b\u548c\u63a5\u53e3\u3002Class\u662f\u666e\u901a\u7c7b\u3001\u63a5\u53e3\u3001\u679a\u4e3e\u7c7b\u3001\u6570\u7ec4\u7b49\u7684\u62bd\u8c61\uff0c\u5373\u5b83\u4eec\u7684\u7c7b\u578b\u5c31\u662fClass\uff0c\u5b83\u4eec\u662fClass\u7684\u5b9e\u4f8b\u3002<\/p>\n
\u65e2\u7136Class\u4ee3\u8868\u7740\u7c7b\u548c\u63a5\u53e3\uff0c\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4ed6\u7684\u5b9e\u4f8b\uff08\u5b57\u8282\u7801\u6587\u4ef6\uff09\u6765\u83b7\u53d6\u5bf9\u5e94\u7c7b\u6216\u63a5\u53e3\u7684\u4fe1\u606f\uff0c\u5982\uff1a\u6ce8\u89e3\u3001\u4fee\u9970\u7b26\u3001\u7c7b\u578b\u3001\u7c7b\u7684\u540d\u79f0\u3001\u5c5e\u6027\u3001\u65b9\u6cd5\u3001\u6784\u9020\u65b9\u6cd5\u3001\u76f4\u63a5\u7236\u7c7b\u548c\u5b50\u7c7b\u7b49\uff0c\u8fd8\u6709\u53ef\u4ee5\u521b\u5efa\u5b83\u7684\u5b9e\u4f8b\uff0c\u4f46\u53ea\u80fd\u8c03\u7528\u65e0\u53c2\u6784\u9020\u65b9\u6cd5\u6765\u521b\u5efa\u3002<\/p>\n
\u4ec0\u4e48\u770b\u4e0d\u61c2\uff1f\u4e3e\u4e2a\u6817\u5b50\uff0c\u6211\u4eec\u90fd\u77e5\u9053\uff0c\u751f\u7269\u53ef\u4ee5\u5206\u4e3a\u52a8\u7269\u3001\u690d\u7269\u3001\u5fae\u751f\u7269\u548c\u75c5\u6bd2\u7b49\uff0c\u800c\u52a8\u7269\u53c8\u6709\u4eba\u3001\u55b5\u661f\u4eba\u3001\u5c0f\u72d7\u7b49\uff0c\u690d\u7269\u3001\u5fae\u751f\u7269\u548c\u75c5\u6bd2\u4e5f\u4e00\u6837\u3002\u540c\u6837\uff0c\u6211\u4eec\u53ef\u4ee5\u7c7b\u6bd4\u4e00\u4e0b\uff0c\u751f\u7269\u5c31\u662fClass\uff0c\u52a8\u7269\u662f\u666e\u901a\u7c7b\uff0c\u690d\u7269\u662f\u63a5\u53e3\uff0c\u5fae\u751f\u7269\u662f\u679a\u4e3e\u7c7b\u3001\u75c5\u6bd2\u662f\u6570\u7ec4\uff08\u679a\u4e3e\u548c\u6570\u7ec4\u662f\u7279\u6b8a\u7684\u7c7b\uff09\uff0c\u800c\u4eba\u3001\u55b5\u661f\u4eba\u3001\u5c0f\u72d7\u662f\u6211\u4eec\u719f\u6089\u7684\u5bf9\u8c61\uff0c\u5982\u56fe
\n $\"\"$
\n\u8fd9\u4e0b\u53ef\u6574\u660e\u767d\u4e86\u5427\uff0c\u666e\u901a\u7c7b\u3001\u63a5\u53e3\u3001\u679a\u4e3e\u3001\u6570\u7ec4\u5176\u5b9e\u90fd\u53ef\u4ee5\u5f53\u505aClass\u7684\u5bf9\u8c61\u3002<\/p>\n
2\uff09Field\u7c7b<\/strong><\/p>\n
Field\u8868\u793a\u7c7b\u7684\u5c5e\u6027\uff0c\u5c5e\u6027\u542b\u6709\u4fee\u9970\u7b26\u3001\u7c7b\u578b\u3001\u5c5e\u6027\u540d\u79f0\u548c\u503c\u3002\u6240\u4ee5\u53ef\u4ee5\u901a\u8fc7Field\u7684\u5b9e\u4f8b\u83b7\u53d6\u5c5e\u6027\u7684\u4fee\u9970\u7b26\u3001\u7c7b\u578b\u3001\u5c5e\u6027\u540d\u79f0\uff0c\u5e76\u4e14\u53ef\u4ee5\u4fee\u6539\u5c5e\u6027\u7684\u503c\u3002<\/p>\n
3\uff09Method\u7c7b<\/strong><\/p>\n
Method\u8868\u793a\u7c7b\u7684\u6210\u5458\u65b9\u6cd5\uff0c\u65b9\u6cd5\u5305\u62ec\u6ce8\u89e3\u3001\u4fee\u9970\u7b26\u3001\u8fd4\u56de\u7c7b\u578b\u3001\u65b9\u6cd5\u540d\uff0c\u53c2\u6570\u7b49\u3002\u6240\u4ee5\u53ef\u4ee5\u901a\u8fc7Method\u7684\u5b9e\u4f8b\u83b7\u53d6\u65b9\u6cd5\u7684\u7684\u4fe1\u606f\uff0c\u5982\uff0c\u6ce8\u89e3\u3001\u4fee\u9970\u7b26\u3001\u8fd4\u56de\u7c7b\u578b\u3001\u65b9\u6cd5\u540d\u5e76\u4e14\u53ef\u4ee5\u8c03\u7528\u6240\u8868\u793a\u7684\u65b9\u6cd5\u3002<\/p>\n
4\uff09Constructor\u7c7b<\/strong><\/p>\n
Constructor\u8868\u793a\u6784\u9020\u65b9\u6cd5\uff0c\u53ef\u4ee5\u901a\u8fc7Constructor\u7684\u5b9e\u4f8b\u83b7\u53d6\u6784\u9020\u65b9\u6cd5\u7684\u4fe1\u606f\uff0c\u5982\uff0c\u4fee\u9970\u7b26\u7b49\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7\u5b83\u6765\u521b\u5efa\u5b83\u6240\u5728\u7c7b\u7684\u7684\u5b9e\u4f8b\u3002<\/p>\n
5\uff09Modifier\u7c7b<\/strong><\/p>\n
Modifier\u8868\u793a\u4fee\u9970\u7b26\uff0c\u53ef\u901a\u8fc7\u5b83\u6765\u83b7\u53d6\u4fee\u9970\u7b26\u7684\u4fe1\u606f\uff0c\u4f8b\u5982\u4f55\u79cd\u4fee\u9970\u7b26\u7b49<\/p>\n
6\uff09Annotation<\/strong><\/p>\n
Annotation\u4ee3\u8868\u6ce8\u89e3<\/p>\n
\u4ee5\u4e0a\u7c7b\u90fd\u4f4d\u4e8ejava.lang\u4e2d<\/p>\n
2.2 \u83b7\u53d6Class\u5bf9\u8c61\u7684\u65b9\u6cd5<\/strong><\/span><\/div>\n
\u4e86\u89e3\u4e86\u4ec0\u4e48\u662f\u53cd\u5c04\u540e\uff0c\u662f\u4e0d\u662f\u4e5f\u60f3\u4f53\u9a8c\u4e00\u4e0b\u53cd\u5c04\u8fd9\u79cd\u9a9a\u64cd\u4f5c\uff1f<\/p>\n
\u60f3\u79c0\u64cd\u4f5c\uff0c\u9996\u5148\u8981\u83b7\u53d6Class\u5bf9\u8c61\u5427\uff0c\u56e0\u4e3aClass\u5bf9\u8c61\u662f\u4ee3\u8868\u7740\u5404\u79cd\u7c7b\uff0c\u6709\u4e86\u5b83\u4e4b\u540e\u624d\u53ef\u4ee5\u5f97\u5230\u7c7b\u7684\u5404\u79cd\u4fe1\u606f\u3002\u83b7\u53d6\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n
1\uff09\u901a\u8fc7object.getClass()<\/strong><\/p>\n
\r\npublic static void main(String[] args) {\r\n \r\n Car car = new Car();\r\n \r\n Class clazz = car.getClass();\r\n }\r\n<\/pre>\n
\u6ce8\u610f\uff1a\u6b64\u65b9\u6cd5\u4e0d\u9002\u7528\u4e8eint\u3001float\u7b49\u7c7b\u578b<\/p>\n
2\uff09\u901a\u8fc7(\u7c7b\u578b\u540d).class\u3001\u5305\u88c5\u7c7b.Type<\/strong><\/p>\n
\r\npublic static void main(String[] args) {\r\n Class clazz = Car.class;\r\n Class cls1 = int.class;\r\n Class cls2 = String.class;\r\n Class cls3=Iteger.Type\r\n }\r\n<\/pre>\n
3\uff09\u901a\u8fc7Class.forClass(String \u7c7b\u7684\u5168\u9650\u5b9a\u540d\uff09<\/strong><\/p>\n
\r\n1 try {\r\n2 Class clz = Class.forName(\"com.frank.test.Car\");\r\n3 } catch (ClassNotFoundException e) {\r\n4 e.printStackTrace();\r\n5 }\r\n<\/pre>\n
\u91c7\u7528\u54ea\u79cd\u65b9\u6cd5\u6765\u83b7\u53d6\uff0c\u770b\u5b9e\u9645\u60c5\u51b5\u800c\u5b9a\u3002<\/p>\n
2.3\u83b7\u53d6\u7c7b\u4fe1\u606f<\/strong><\/span><\/div>\n
\u6709\u4e86Class\u5bf9\u8c61\u540e\uff0c\u5c31\u53ef\u4ee5\u83b7\u53d6\u7c7b\u7684\u6210\u5458\uff08\u65b9\u6cd5+\u5c5e\u6027\uff09\u3001\u6ce8\u89e3\u548c\u7c7b\u7684\u4fee\u9970\u7b26\u7b49\u3002\u4e0a\u9762\u4e5f\u8bf4\u4e86\uff0cjava\u4e2d\u65b9\u6cd5\u7528Method\u7c7b\u8868\u793a\u3001\u5c5e\u6027\u7528Field\u7c7b\u8868\u793a\u3001\u6ce8\u89e3\u7528Annotation\u7c7b\u6765\u8868\u793a\u3001\u4fee\u9970\u7b26\u7528Modifier\u7c7b\u8868\u793a\u3002Class\u7c7b\u4e2d\u6709\u5bf9\u5e94\u7684\u65b9\u6cd5\u6765\u83b7\u53d6\u4ed6\u4eec\u3002\u5982\u4e0b\uff1a<\/p>\n
2.3.1 \u83b7\u53d6\u5c5e\u6027Field\u7684\u5bf9\u8c61<\/strong><\/p>\n
\r\n\/\/\u83b7\u53d6\u6240\u6709\u7684\u5c5e\u6027\uff0c\u4f46\u4e0d\u5305\u62ec\u4ece\u7236\u7c7b\u7ee7\u627f\u4e0b\u6765\u7684\u5c5e\u6027\r\npublic Field[] getDeclaredFields() throws SecurityException \r\n\/\/\u83b7\u53d6\u81ea\u8eab\u7684\u6240\u6709\u7684 public \u5c5e\u6027\uff0c\u5305\u62ec\u4ece\u7236\u7c7b\u7ee7\u627f\u4e0b\u6765\u7684\u3002\r\npublic Field[] getFields() throws SecurityException\r\n\/\/\u83b7\u53d6\u5728\u672c\u7c7b\u4e2d\u58f0\u660e\u7684\u6307\u5b9a\u7684\u5c5e\u6027\uff0c\u53c2\u6570\u4e3a\u5c5e\u6027\u7684\u540d\u79f0\r\npublic Field getDeclaredField(String name) \r\n\/\/\u83b7\u53d6\u6307\u5b9a\u7684\u516c\u6709\u5c5e\u6027\uff0c\u5305\u62ec\u7236\u7c7b\u7684\uff0c\u53c2\u6570\u4e3a\u5c5e\u6027\u7684\u540d\u79f0\r\npublic Field getField(String name)\r\n<\/pre>\n
2.3.2 \u83b7\u53d6\u65b9\u6cd5Method\u5bf9\u8c61<\/strong><\/p>\n
\r\n\/\/\u83b7\u53d6\u672c\u7c7b\u58f0\u660e\u6307\u5b9a\u7684\u7684\u65b9\u6cd5\uff0c\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u65b9\u6cd5\u7684\u540d\u79f0\uff0c\u540e\u9762\u7684\u53c2\u6570\u662f\u65b9\u6cd5\u53c2\u6570\u7c7b\u578b\u7684\u7c7b\uff0c\r\n\/\/\u5982\u83b7\u53d6setName\uff08String name\uff09\u65b9\u6cd5\uff0cgetDeclareMethod\uff08\u201csetName\u201d\uff0cString.Class\uff09\r\npublic Method getDeclaredMethod(String name, Class< ?>... parameterTypes)\r\n\/\/\u83b7\u53d6\u516c\u6709\u7684\u65b9\u6cd5\uff0c\u5305\u62ec\u7236\u7c7b\u7684\r\npublic Method getMethod(String name, Class< ?>... parameterTypes)\r\n\/\/\u83b7\u53d6\u672c\u7c7b\u4e2d\u58f0\u660e\u7684\u6240\u6709\u65b9\u6cd5\r\npublic Method[] getDeclaredMethods()\r\n\/\/\u83b7\u53d6\u6240\u6709\u7684\u516c\u6709\u65b9\u6cd5\uff0c\u5305\u62ec\u7236\u7c7b\u7684\r\npublic Method[] getMethods()\r\n<\/pre>\n
2.3.3 \u83b7\u53d6\u6784\u9020\u5668Constructor\u5bf9\u8c61<\/strong><\/p>\n
\r\n \/\/\u83b7\u53d6\u672c\u7c7b\u4e2d\u6307\u5b9a\u7684\u6784\u9020\u65b9\u6cd5\r\npublic Constructor getDeclaredConstructor(Class< ?>... parameterTypes)\r\n\/\/\u83b7\u53d6\u6307\u5b9a\u7684\u516c\u6709\u6784\u9020\u65b9\u6cd5\r\npublic Constructor<\/t> getConstructor(Class< ?>... parameterTypes)\r\n\/\/\u83b7\u53d6\u672c\u7c7b\u4e2d\u6240\u6709\u7684\u6784\u9020\u65b9\u6cd5\r\npublic Constructor< ?>[] getDeclaredConstructors() throws SecurityException \r\n\/\/\u83b7\u53d6\u672c\u7c7b\u4e2d\u6240\u6709\u7684\u516c\u6709\u6784\u9020\u65b9\u6cd5\r\npublic Constructor< ?>[] getConstructors()\r\n<\/t><\/pre>\n
\u6784\u9020\u65b9\u6cd5\u7684\u83b7\u53d6\u4e0e\u666e\u901a\u65b9\u6cd5\u7684\u83b7\u53d6\u5927\u81f4\u662f\u4e00\u6837\u7684\u3002<\/p>\n
------------------------------------------------------------------<\/p>\n
\u4ee5\u4e0a\u7684\u65b9\u6cd5\u90fd\u662f\u5728Class\u7c7b\u4e2d\uff0c\u522b\u50bb\u50bb\u4e0d\u77e5\u9053\uff08\u522b\u95ee\u6211\u600e\u4e48\u77e5\u9053\u7684>_>\uff09,\u7136\u540e\u901a\u8fc7Class\u5bf9\u8c61\u8c03\u7528\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n
\u8fd9\u91cc\u53ea\u662f\u5217\u4e3e\u4e86\u5e38\u7528\u7c7b\u4fe1\u606f\u7684\u7684\u83b7\u53d6\u65b9\u6cd5\uff0c\u5176\u4ed6\u4fe1\u606f\u7684\u83b7\u53d6\u65b9\u6cd5\uff0c\u770bAPI\u6587\u6863\u5427\uff0c\u5982\u6ce8\u89e3\u3001\u7c7b\u7684Class\u7684\u5bf9\u8c61\uff08\u989d\u597d\u50cf\u6709\u70b9\u7ed5\u3002\u3002\u3002\uff09\u7b49.<\/p>\n
2.4 \u83b7\u53d6\u7c7b\u6210\u5458\u4fe1\u606f<\/strong><\/span><\/div>\n
\u4e0a\u9762\u53ea\u662f\u83b7\u53d6\u4e86\u7c7b\u7684\u6210\u5458\u6240\u4ee3\u8868\u7c7b\u7684\u5bf9\u8c61\uff0c\u6211\u4eec\u8fd8\u8981\u4f7f\u7528\u4ed6\u4eec\u6216\u8005\u83b7\u53d6\u6210\u5458\u7684\u4fe1\u606f\uff08\u540d\u79f0\u3001\u4fee\u9970\u7b26\u7b49\uff09\u3002\u56e0\u4e3a\u6709\u4e86\u4ee3\u8868\u6210\u5458\u7684\u5bf9\u8c61\uff0c\u4f7f\u7528\u5bf9\u8c61\u8c03\u7528\u5b9e\u4f8b\u65b9\u6cd5\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n
2.4.1 Field\u7c7b<\/strong><\/p>\n
Field\u7c7b\u7684\u65b9\u6cd5\u5927\u6982\u53ef\u4ee5\u5206\u4e3a\u4e24\u79cd\uff0c\u4e00\u79cd\u662f\u83b7\u53d6\u5c5e\u6027\u7684\u4fe1\u606f\uff0c\u53e6\u5916\u4e00\u79cd\u662f\u8bbe\u7f6e\u5c5e\u6027\u7684\u503c\u3002<\/p>\n
\u7b2c\u4e00\u79cd\uff1a<\/p>\n
\r\n\/\/\u8fd4\u56de\u7531\u6b64 Field\u5bf9\u8c61\u8868\u793a\u7684\u5b57\u6bb5\u7684\u540d\u79f0\r\n String getName() \r\n\/\/\u8fd4\u56de\u4e00\u4e2a \u7c7b\u5bf9\u8c61\u6807\u8bc6\u4e86\u6b64\u8868\u793a\u7684\u5b57\u6bb5\u7684\u58f0\u660e\u7c7b\u578b Field\u5bf9\u8c61\u3002 \r\nClass< ?> getType() \r\n\/\/\u8fd4\u56de\u7531\u8be5 Field\u5bf9\u8c61\u8868\u793a\u7684\u5b57\u6bb5\u7684Java\u8bed\u8a00\u4fee\u9970\u7b26\uff0c\u4f5c\u4e3a\u6574\u6570\u3002\u628a\u6574\u6570\u4f5c\u4e3aModifier\u7684\u6784\u9020\u65b9\u6cd5\u7684\u53c2\u6570\uff0c\u5c31\u53ef\u4ee5\u83b7\u53d6\u8be5\u6574\u6570\u4ee3\u8868\u7684\u4fee\u9970\u7b26\u7c7b\u7684\u5bf9\u8c61\u4e86\r\nint getModifiers() \r\n----------------------------------------------------------------\r\n\r\n\/\/\u83b7\u53d6\u7c7b\u578b\u4e3a int\u7684\u9759\u6001\u6216\u5b9e\u4f8b\u5b57\u6bb5\u7684\u503c\uff0c\u6216\u901a\u8fc7\u6269\u5c55\u8f6c\u6362\u8f6c\u6362\u4e3a\u7c7b\u578b int\u7684\u53e6\u4e00\u4e2a\u539f\u59cb\u7c7b\u578b\u7684\u503c\u3002\r\nint getInt(Object obj) \r\n\/\/\u83b7\u53d6\u7c7b\u578b\u4e3a long\u7684\u9759\u6001\u6216\u5b9e\u4f8b\u5b57\u6bb5\u7684\u503c\uff0c\u6216\u901a\u8fc7\u6269\u5927\u8f6c\u6362\u83b7\u5f97\u53ef\u8f6c\u6362\u4e3a\u7c7b\u578b long\u7684\u53e6\u4e00\u4e2a\u57fa\u672c\u7c7b\u578b\u7684\u503c\u3002 \r\nlong getLong(Object obj) \r\n......\u6b64\u5904\u7701\u7565\u4e00\u5806get**\uff08Object obj\uff09\u7684\u65b9\u6cd5\uff0c\u5c5e\u6027\u662f\u4ec0\u4e48\u57fa\u672c\u7c7b\u578b\uff0c\u5c31get\u4ec0\u4e48\u5c31\u884c\u4e86\r\n14\u5c5e\u6027\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u90a3\u4e48\u5c31\u8c03\u7528\u4ee5\u4e0b\u65b9\u6cd5\r\n\/\/\u8fd4\u56de\u8be5\u6240\u8868\u793a\u7684\u5b57\u6bb5\u7684 Field \uff0c\u6307\u5b9a\u7684\u5bf9\u8c61\u4e0a\u3002 16 Object get(Object obj)\r\n<\/pre>\n
\u7b2c\u4e8c\u79cd\uff1a<\/p>\n
\r\n\/\/\u8bbe\u7f6e\u4f5c\u4e3a\u4e00\u4e2a\u5b57\u6bb5\u7684\u503c double\u6307\u5b9a\u7684\u5bf9\u8c61\u4e0a\u3002 \r\nvoid setDouble(Object obj, double d) \r\n\/\/\u8bbe\u7f6e\u4f5c\u4e3a\u4e00\u4e2a\u5b57\u6bb5\u7684\u503c float\u6307\u5b9a\u7684\u5bf9\u8c61\u4e0a\u3002 \r\nvoid setFloat(Object obj, float f) \r\n\/\/\u8bbe\u7f6e\u4f5c\u4e3a\u4e00\u4e2a\u5b57\u6bb5\u7684\u503c int\u6307\u5b9a\u7684\u5bf9\u8c61\u4e0a\u3002\r\nvoid setInt(Object obj, int i) \r\n........\u6b64\u5904\u7701\u7565\u4e00\u5806set**()\u65b9\u6cd5\uff0c\u5c5e\u6027\u662f\u4ec0\u4e48\u57fa\u672c\u7c7b\u578b\u5c31set\u4ec0\u4e48\u5c31\u884c\u4e86\r\n\u5c5e\u6027\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u90a3\u4e48\u5c31\u8c03\u7528\u4ee5\u4e0b\u65b9\u6cd5\r\n\/\/\u5c06\u6307\u5b9a\u5bf9\u8c61\u53c2\u6570\u4e0a\u7684\u6b64 Field\u5bf9\u8c61\u8868\u793a\u7684\u5b57\u6bb5\u8bbe\u7f6e\u4e3a\u6307\u5b9a\u7684\u65b0\u503c\u3002\r\nvoid set(Object obj, Object value)\r\n<\/pre>\n
\u6ce8\u610f\u5566\uff1a\u5982\u679c\u6ca1\u6709\u8bbf\u95ee\u6743\u9650\u7684\u8bdd\uff0c\u9ed8\u8ba4\u662f\u4e0d\u80fd\u8bbe\u7f6e\u5c5e\u6027\u503c\u7684\uff0c\u90a3\ufffd\ufffd\u4e48\u529e\u5462\uff1f\u662f\u4e0d\u662f\u5c31\u79c0\u4e0d\u4e86\u64cd\u4f5c\u4e86\uff1f\u7136\u800c\uff0c\u524d\u9762\u4e5f\u8bf4\u4e86\uff0c\u53cd\u5c04\u5f88\u725b\u903c\uff0c\u53ef\u4ee5\u6765\u4e00\u4e9b\u975e\u5e38\u89c4\u64cd\u4f5c\uff0c
\n\u8fd9\u65f6\u6211\u4eec\u8c03\u7528Class\u5bf9\u8c61\u7684setAccessible\uff08true\uff09\u65b9\u6cd5\u5c31\u53ef\u4ee5\u4e86\uff01
\n\u662f\u4e0d\u662f\u89c9\u5f97\u53cd\u5c04\u53ef\u4ee5\u5f88\u5f3a\uff1f
\n2.4.2 Method\u7c7b<\/strong>
\nMethod\u7c7b\u7684\u65b9\u6cd5\u4e3b\u8981\u662f\u83b7\u53d6\u65b9\u6cd5\u7684\u4fe1\u606f
\n\u90e8\u5206\u65b9\u6cd5\uff1a<\/p>\n
\r\n1 int getModifiers() \/\/\u8fd4\u56de\u7531\u8be5\u5bf9\u8c61\u8868\u793a\u7684\u53ef\u6267\u884c\u6587\u4ef6\u7684Java\u8bed\u8a00modifiers \u3002 \r\n2 String getName() \/\/\u8fd4\u56de\u7531\u6b64 \u65b9\u6cd5\u5bf9\u8c61\u8868\u793a\u7684\u65b9\u6cd5\u7684\u540d\u79f0\uff0c\u4f5c\u4e3a String \u3002 \r\n3 Annotation[][] getParameterAnnotations() \/\/\u8fd4\u56de\u4e00\u4e2a Annotation s\u7684\u6570\u7ec4\u6570\u7ec4\uff0c\u8868\u793a\u7531\u8be5\u5bf9\u8c61\u8868\u793a\u7684Executable\u7684\u5f62\u5f0f\u53c2\u6570\u7684\u58f0\u660e\u987a\u5e8f\u7684 Executable \u3002 \r\n4 int getParameterCount() \/\/\u8fd4\u56de\u7531\u6b64\u5bf9\u8c61\u8868\u793a\u7684\u53ef\u6267\u884c\u6587\u4ef6\u7684\u5f62\u5f0f\u53c2\u6570\uff08\u65e0\u8bba\u662f\u663e\u5f0f\u58f0\u660e\u8fd8\u662f\u9690\u5f0f\u58f0\u660e\uff09\u7684\u6570\u91cf\u3002 \r\n5 Class< ?>[] getParameterTypes() \/\/\u8fd4\u56de\u4e00\u4e2a \u7c7b\u5bf9\u8c61\u7684\u6570\u7ec4\uff0c \u7c7b\u4ee5\u58f0\u660e\u987a\u5e8f\u8868\u793a\u7531\u8be5\u5bf9\u8c61\u8868\u793a\u7684\u53ef\u6267\u884c\u6587\u4ef6\u7684\u5f62\u5f0f\u53c2\u6570\u7c7b\u578b\u3002 \r\n<\/pre>\n
2.4.3 Constructor\u7c7b<\/strong>
\nConstructor\u7c7b\u7684\u65b9\u6cd5\u4e3b\u8981\u662f\u83b7\u53d6\u6784\u65b9\u6cd5\u7684\u4fe1\u606f\u548c\u521b\u5efa\u5bf9\u8c61<\/p>\n
\u83b7\u53d6\u65b9\u6cd5\u4fe1\u606f\uff1a<\/p>\n
\r\n1 int getModifiers() \/\/\u8fd4\u56de\u7531\u8be5\u5bf9\u8c61\u8868\u793a\u7684\u53ef\u6267\u884c\u6587\u4ef6\u7684Java\u8bed\u8a00modifiers \u3002 \r\n2 String getName() \/\/\u4ee5\u5b57\u7b26\u4e32\u5f62\u5f0f\u8fd4\u56de\u6b64\u6784\u9020\u51fd\u6570\u7684\u540d\u79f0\u3002 \r\n3 Annotation[][] getParameterAnnotations() \/\/\u8fd4\u56de\u7684\u6570\u7ec4\u7684\u6570\u7ec4 Annotation\u8868\u793a\u7684\u5f62\u53c2\u8fdb\u884c\u6ce8\u91cas\u65f6\uff0c\u58f0\u660e\u987a\u5e8f\u7684\u7684 Executable\u8be5\u5bf9\u8c61\u8868\u793a\u3002 \r\n4 int getParameterCount() \/\/\u8fd4\u56de\u7531\u6b64\u5bf9\u8c61\u8868\u793a\u7684\u53ef\u6267\u884c\u6587\u4ef6\u7684\u5f62\u5f0f\u53c2\u6570\uff08\u65e0\u8bba\u662f\u663e\u5f0f\u58f0\u660e\u8fd8\u662f\u9690\u5f0f\u58f0\u660e\uff09\u7684\u6570\u91cf\u3002 \r\n5 Class< ?>[] getParameterTypes() \/\/\u8fd4\u56de\u4e00\u4e2a \u7c7b\u5bf9\u8c61\u7684\u6570\u7ec4\uff0c \u7c7b\u4ee5\u58f0\u660e\u987a\u5e8f\u8868\u793a\u7531\u8be5\u5bf9\u8c61\u8868\u793a\u7684\u53ef\u6267\u884c\u6587\u4ef6\u7684\u5f62\u5f0f\u53c2\u6570\u7c7b\u578b\u3002 \r\n<\/pre>\n
\u521b\u5efa\u5bf9\u8c61\u7684\u65b9\u6cd5\u5148\u4e0d\u8bf4\uff0c\u653e\u5230\u540e\u9762\u53bb\u3002<\/p>\n
2.5 \u53cd\u5c04\u521b\u5efa\u5bf9\u8c61\u548c\u8c03\u7528\u65b9\u6cd5<\/strong><\/span><\/div>\n
2.5.1 \u521b\u5efa\u666e\u901a\u7c7b\u7684\u5bf9\u8c61<\/strong><\/p>\n
\u521b\u5efa\u666e\u901a\u7c7b\u7684\u5bf9\u8c61\u53ef\u4ee5\u5206\u4e3a\u4e24\u79cd\u65b9\u6cd5<\/p>\n
\u7b2c\u4e00\u79cd\uff1a\u8c03\u7528Class\u5bf9\u8c61\u7684\u65b9\u6cd5<\/p>\n
\r\n4 \/\/\u9996\u5148\u83b7\u53d6Class\u5bf9\u8c61\r\n5 Class clazz=Class.forClass(\"test.Student\");\r\n6 \/\/\u521b\u5efa\u5bf9\u8c61\r\n7 Student stu=(Student)clazz.newInstance();\r\n\u6ce8\uff1a\u6b64\u65b9\u6cd5\u53ea\u80fd\u521b\u5efa\u65e0\u53c2\u6784\u9020\u51fd\u6570\u7684\u7c7b\u7684\u5bf9\u8c61\r\n<\/pre>\n
\u7b2c\u4e8c\u79cd\uff1a\u901a\u8fc7Constructor\u7684newInstance\uff08\uff09\u65b9\u6cd5<\/p>\n
\r\n \/\/\u9996\u5148\u521b\u5efaClass\u5bf9\u8c61\r\nClass clazz=Class.forClass(\"test.Student\");\r\n\/\/\u83b7\u53d6\u60f3\u8c03\u7528\u7684\u6784\u9020\u51fd\u6570\r\nConstructor constructor=clazz.getConstructor(String.class, int.class);\r\n\/\/\u8c03\u7528Constructor\u7684newInstance\uff08\uff09\u65b9\u6cd5\r\nStudent stu=(Student)constructor.newInstance(\"\u5927\u738b\"\uff0c20);\r\n<\/pre>\n
2.5.2 \u521b\u5efa\u6570\u7ec4<\/strong><\/p>\n
\u6570\u7ec4\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a Class\uff0c\u800c\u5728 Class \u4e2d\u5b58\u5728\u4e00\u4e2a\u65b9\u6cd5\u7528\u6765\u8bc6\u522b\u5b83\u662f\u5426\u4e3a\u4e00\u4e2a\u6570\u7ec4\u3002<\/p>\n
\u53cd\u5c04\u521b\u5efa\u6570\u7ec4\u662f\u901a\u8fc7 Array.newInstance(T.class,\u7ef4\u6570) \u8fd9\u4e2a\u65b9\u6cd5\u3002<\/p>\n
\u7b2c\u4e00\u4e2a\u53c2\u6570\u6307\u5b9a\u7684\u662f\u6570\u7ec4\u5185\u7684\u5143\u7d20\u7c7b\u578b\uff0c\u540e\u9762\u7684\u662f\u53ef\u53d8\u53c2\u6570\uff0c\u8868\u793a\u7684\u662f\u76f8\u5e94\u7ef4\u5ea6\u7684\u6570\u7ec4\u957f\u5ea6\u9650\u5236\u3002<\/p>\n
\u6bd4\u5982\uff0c\u6211\u8981\u521b\u5efa\u4e00\u4e2a int[2][3] \u7684\u6570\u7ec4\u3002<\/p>\n
\r\n1 Int[][] a=Array.newInstance(Integer.TYPE, 2, 3);\r\n<\/pre>\n
2.5.3 \u8c03\u7528\u65b9\u6cd5<\/strong><\/p>\n
\u7528\u4e86\u4e0a\u9762\u7684\u65b9\u6cd5\uff0c\u5c31\u6709Class\u5bf9\u8c61\uff0c\u6709\u65b9\u6cd5Method\u5bf9\u8c61\uff0c\u6709\u5b9e\u4f8b\uff0c\u73b0\u5728\u5df2\u7ecf\u4e07\u4e8b\u4ff1\u5907\uff0c\u53ea\u6b20\u4e1c\u98ce\u4e86\u3002<\/p>\n
\u90a3\u6211\u4eec\u600e\u4e48\u8c03\u7528\u65b9\u6cd5\u5462\uff1f\u5728Method\u7c7b\u6709\u8fd9\u4e48\u4e00\u4e2a\u65b9\u6cd5Object invoke(Object obj, Object... args\uff09\uff0cobject\u4e3a\u5b9e\u4f8b\u5bf9\u8c61\uff0cargs\u4e3a\u8c03\u7528\u65b9\u6cd5\u7684\u53c2\u6570<\/p>\n
\u6765\u4e2a\u6817\u5b50\uff1a<\/p>\n
\r\nClass< ?> c = Class.forName(\"com.kal01.reflect05.Person\");\/\/\u83b7\u53d6Class\u5bf9\u8c61\r\nPerson p1 = (Person) c.newInstance();\/\/\u83b7\u53d6\u5b9e\u4f8b\r\nMethod m3 = c.getDeclaredMethod(\"test\");\/\/\u83b7\u53d6\u65b9\u6cd5\r\nm3.setAccessible(true);\/\/\u5f53\u6ca1\u6709\u8bbf\u95ee\u6743\u9650\u65f6\uff0c\u8bbe\u7f6e\u4e00\u4e0b\u5c31\u53ef\u4ee5\r\nm3.invoke(p1);\/\/\u8c03\u7528\u65b9\u6cd5\r\nm3.setAccessible(false);\/\/\u4fee\u6539\u4e86\u8bbf\u95ee\u6743\u9650\uff0c\u8bb0\u5f97\u4fee\u6539\u56de\u6765\r\n<\/pre>\n
2.6 \u9759\u6001\u52a0\u8f7d\u4e0e\u52a8\u6001\u52a0\u8f7d<\/strong><\/span><\/div>\n
\u770b\u5230\u8fd9\u91cc\u662f\u4e0d\u662f\u6709\u4e2a\u7591\u95ee\uff0c\u53cd\u5c04\u8c03\u7528\u7c7b\u7684\u65b9\u6cd5\u597d\u50cf\u9664\u4e86\u590d\u6742\u4e4b\u5916\uff0c\u8ddf\u6211\u4eec\u5e73\u65f6\u8c03\u7528\u6ca1\u4ec0\u4e48\u533a\u522b\u3002\u4f55\u5fc5\u5f04\u90a3\u4e48\u82b1\u91cc\u80e1\u54e8\uff1f<\/p>\n
\u6240\u4ee5\u5728\u8fd9\u91cc\u7b80\u5355\u8bf4\u4e00\u4e0b\u9759\u6001\u52a0\u8f7d\u4e0e\u52a8\u6001\u52a0\u8f7d\u3002<\/p>\n
\u56de\u60f3\u4e00\u4e0b\u4e4b\u524d\u716e\u996d\u7684\u90a3\u4e2a\u6817\u5b50\uff0c\u9759\u6001\u52a0\u8f7d\u548c\u52a8\u6001\u52a0\u8f7d\u7684\u8fd9\u4e2a\u4f8b\u5b50\u6709\u70b9\u76f8\u4f3c\u3002<\/p>\n
\u9759\u6001\u52a0\u8f7d\uff1a\u6211\u4eec\u5728\u7a0b\u5e8f\u4e2d\u4f7f\u7528\u7c7b\u65f6\uff0c\u9759\u6001\u52a0\u8f7d\u662f\u8981\u6c42\u8981\u4f7f\u7528\u7684\u7c7b\u5fc5\u987b\u8981\u6c42\u5728\u7f16\u8bd1\u7684\u65f6\u5019\u5b58\u5728\uff0c\u5426\u5219\u7f16\u8bd1\u5668\u62a5\u9519\uff0c\u65e0\u6cd5\u8fd0\u884c\u7a0b\u5e8f\u3002\u7f16\u7801\u65f6\u5fd8\u8bb0\u5bfc\u5305\u65f6\uff0c\u7ecf\u5e38\u4f1a\u51fa\u73b0\u8fd9\u79cd\u9519\u8bef\u3002<\/p>\n
\u52a8\u6001\u52a0\u8f7d\uff1a\u5229\u7528\u53cd\u5c04\u6765\u52a0\u8f7d\u7c7b\uff08\u5373\u83b7\u5f97Class\u5bf9\u8c61\uff09\uff0c\u4e0d\u8981\u6c42\u6211\u4eec\u5728\u7f16\u8bd1\u671f\u5b58\u5728\u8981\u662f\u7528\u7684\u90a3\u4e2a\u7c7b\uff0c\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\uff0c\u624d\u53bb\u5bfb\u627e\u7c7b\uff08\u53ef\u4ee5\u4ecejar\u5305\uff0c\u7f51\u7edc\u7b49\u5bfb\u627e\uff09\uff0c\u7136\u540e\u628a\u7c7b\u52a0\u8f7d\u5230\u65b9\u6cd5\u533a\u4e2d\uff0c\u5982\u679c\u6ca1\u6709\u627e\u5230\u8fd9\u4e2a\u7c7b\u4f1a\u629b\u51faClassNotFoundException\u5f02\u5e38\u3002<\/p>\n
\u6709\u56fe\u6709\u771f\u76f8\uff1a
\n $\"\"$ <\/p>\n
\u8fd9\u4e0b\u770b\u51fa\u6765\u53cd\u5c04\u7684\u725b\u903c\u4e4b\u5904\u4e86\u5427\uff0c\u5229\u7528\u53cd\u5c04\u4f7f\u7528\u7c7b\u65f6\uff0c\u5e76\u4e0d\u9700\u8981\u8fd9\u4e2a\u7c7b\u5728\u7f16\u8bd1\u671f\u5b58\u5728\uff0c\u8fd9\u5c31\u589e\u52a0\u4e86\u7a0b\u5e8f\u7684\u7075\u6d3b\u6027\uff0c\u53ef\u4ee5\u5b8c\u6210\u6211\u4eec\u7684\u9a9a\u64cd\u4f5c\uff01<\/p>\n
\u6700\u540e\u603b\u7ed3\u4e00\u4e0b\uff1a<\/p>\n
\u4f7f\u7528\u53cd\u5c04\u65f6\uff0c\u8bb0\u4f4f\u4e00\u53e5\u8bdd\uff1a\u8001\u54e5\uff0c\u7a33\u4f4f\uff0c\u522b\u7ffb\u8f66\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
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