{"id":226,"date":"2017-08-23T10:32:03","date_gmt":"2017-08-23T10:32:03","guid":{"rendered":""},"modified":"2020-09-29T14:12:51","modified_gmt":"2020-09-29T06:12:51","slug":"java%e7%9a%84%e5%8f%8d%e5%b0%84%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"http:\/\/weizn.net\/?p=226","title":{"rendered":"Java\u7684\u53cd\u5c04\u673a\u5236"},"content":{"rendered":"

\u4e00\u00a0 \u53cd\u5c04\u673a\u5236\u7684\u6982\u5ff5:<\/strong><\/span><\/p>\n

\u6307\u5728\u8fd0\u884c\u72b6\u6001\u4e2d,\u5bf9\u4e8e\u4efb\u610f\u4e00\u4e2a\u7c7b,\u90fd\u80fd\u591f\u77e5\u9053\u8fd9\u4e2a\u7c7b\u7684\u6240\u6709\u5c5e\u6027\u548c\u65b9\u6cd5,\u5bf9\u4e8e\u4efb\u610f\u4e00\u4e2a\u5bf9\u8c61,\u90fd\u80fd\u8c03\u7528\u5b83\u7684\u4efb\u610f\u4e00\u4e2a\u65b9\u6cd5.\u8fd9\u79cd\u52a8\u6001\u83b7\u53d6\u4fe1\u606f,\u4ee5\u53ca\u52a8\u6001\u8c03\u7528\u5bf9\u8c61\u65b9\u6cd5\u7684\u529f\u80fd\u53ebjava\u8bed\u8a00\u7684\u53cd\u5c04\u673a\u5236.<\/span><\/p>\n

\u4e8c\u00a0 \u53cd\u5c04\u673a\u5236\u7684\u5e94\u7528:<\/strong><\/span><\/p>\n

\u751f\u6210\u52a8\u6001\u4ee3\u7406,\u9762\u5411\u5207\u7247\u7f16\u7a0b(\u5728\u8c03\u7528\u65b9\u6cd5\u7684\u524d\u540e\u5404\u52a0\u6808\u5e27).<\/span><\/p>\n

\u4e09\u00a0 \u53cd\u5c04\u673a\u5236\u7684\u539f\u7406:<\/strong><\/span><\/p>\n

1\u00a0 \u9996\u5148\u660e\u786e\u7684\u6982\u5ff5: \u4e00\u5207\u7686\u5bf9\u8c61—-\u7c7b\u4e5f\u662f\u5bf9\u8c61.<\/span><\/p>\n

2\u00a0 \u7136\u540e\u77e5\u9053\u7c7b\u4e2d\u7684\u5185\u5bb9 :modifier \u00a0constructor \u00a0field \u00a0method.<\/span><\/p>\n

3\u00a0 \u5176\u6b21\u660e\u767d\u52a0\u8f7d: \u5f53Animal.class\u5728\u786c\u76d8\u4e2d\u65f6,\u662f\u4e00\u4e2a\u6587\u4ef6,\u5f53\u8f7d\u5165\u5230\u5185\u5b58\u4e2d,\u53ef\u4ee5\u8ba4\u4e3a\u662f\u4e00\u4e2a\u5bf9\u8c61,\u662fjava.lang.class\u7684\u5bf9\u8c61.<\/span><\/p>\n

\u56db \u00a0\u53cd\u5c04\u673a\u5236\u7b80\u5355\u5b9e\u4f8b\u4ee3\u7801<\/strong><\/span><\/p>\n

\/*-----------------------------\u6784\u9020\u51fd\u6570\u4e0d\u5e26\u53c2\u6570--------------------------------*\/<\/pre>\n
\/**\n\u00a0* Created by weizinan on 2017\/8\/23.\n\u00a0*\/\nimport java.lang.reflect.Method;\n\npublic class ReflectTest {\n\u00a0 \u00a0 public static void main(String[] args) throws Exception{\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u83b7\u53d6\u7c7b\n\u00a0 \u00a0 \u00a0 \u00a0 Class<?> c = Class.forName(\"Processor\");\n\u00a0 \u00a0 \u00a0 \u00a0 \/*\n\u00a0 \u00a0 \u00a0 \u00a0 \u83b7\u53d6\u67d0\u4e2a\u7279\u5b9a\u7684\u65b9\u6cd5\n\u00a0 \u00a0 \u00a0 \u00a0 \u901a\u8fc7\uff1a\u65b9\u6cd5\u540d+\u5f62\u53c2\u5217\u8868\n\u00a0 \u00a0 \u00a0 \u00a0 *\/\n\u00a0 \u00a0 \u00a0 \u00a0 Method m = c.getDeclaredMethod(\"print\",String.class);\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u901a\u8fc7\u53cd\u5c04\u673a\u5236\u6267\u884cprint\u65b9\u6cd5.\n\u00a0 \u00a0 \u00a0 \u00a0 Object o = c.newInstance();\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u8c03\u7528o\u5bf9\u8c61\u7684m\u65b9\u6cd5,\u4f20\u9012\u53c2\u6570\uff0c\u65b9\u6cd5\u7684\u6267\u884c\u7ed3\u679c\u662fretValue\n\u00a0 \u00a0 \u00a0 \u00a0 Object retValue = m.invoke(o, \"Hello World\");\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(retValue);\n\u00a0 \u00a0 }\n}<\/pre>\n
<\/pre>\n
\/**\n\u00a0* Created by weizinan on 2017\/8\/23.\n\u00a0*\/\npublic class Processor {\n\u00a0 \u00a0 public String print(String str){\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"Function invoke succeeded. Parameter: \" + str);\n\u00a0 \u00a0 \u00a0 \u00a0 return \"Return String.\";\n\u00a0 \u00a0 }\n}<\/pre>\n
\/*---------------------------------------\u6784\u9020\u51fd\u6570\u5e26\u53c2\u6570-------------------------------------*\/<\/pre>\n
\/**\n\u00a0* Created by weizinan on 2017\/8\/23.\n\u00a0*\/\nimport java.lang.reflect.Constructor;\nimport java.lang.reflect.Method;\n\npublic class ReflectTest {\n\u00a0 \u00a0 public static void main(String[] args) throws Exception{\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u83b7\u53d6\u7c7b\n\u00a0 \u00a0 \u00a0 \u00a0 Class<?> c = Class.forName(\"Processor\");\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u8bbe\u5b9a\u6784\u9020\u51fd\u6570\u7684\u53c2\u6570\u7c7b\u578b\n\u00a0 \u00a0 \u00a0 \u00a0 Class<?>[] parTypes=new Class<?>[2];\n\u00a0 \u00a0 \u00a0 \u00a0 parTypes[0]=String.class;\n\u00a0 \u00a0 \u00a0 \u00a0 parTypes[1]=int.class;\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u83b7\u53d6\u6784\u9020\u5668\n\u00a0 \u00a0 \u00a0 \u00a0 Constructor<?> con = c.getConstructor(parTypes);\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u521d\u59cb\u5316\u6784\u9020\u53c2\u6570\n\u00a0 \u00a0 \u00a0 \u00a0 Object[] pars=new Object[2];\n\u00a0 \u00a0 \u00a0 \u00a0 pars[0]=\"1234567890\";\n\u00a0 \u00a0 \u00a0 \u00a0 pars[1]=1024;\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u6784\u9020\u5bf9\u8c61\n\u00a0 \u00a0 \u00a0 \u00a0 Object o=con.newInstance(pars);\n\u00a0 \u00a0 \u00a0 \u00a0 \/*\n\u00a0 \u00a0 \u00a0 \u00a0 \u83b7\u53d6\u67d0\u4e2a\u7279\u5b9a\u7684\u65b9\u6cd5\n\u00a0 \u00a0 \u00a0 \u00a0 \u901a\u8fc7\uff1a\u65b9\u6cd5\u540d+\u5f62\u53c2\u5217\u8868\n\u00a0 \u00a0 \u00a0 \u00a0 *\/\n\u00a0 \u00a0 \u00a0 \u00a0 Method m = c.getDeclaredMethod(\"print\",String.class);\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u8c03\u7528o\u5bf9\u8c61\u7684m\u65b9\u6cd5,\u4f20\u9012\u53c2\u6570\uff0c\u65b9\u6cd5\u7684\u6267\u884c\u7ed3\u679c\u662fretValue\n\u00a0 \u00a0 \u00a0 \u00a0 String retValue = (String)m.invoke(o, \"Hello World\");\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(retValue);\n\u00a0 \u00a0 }\n}<\/pre>\n
\/**\n\u00a0* Created by weizinan on 2017\/8\/23.\n\u00a0*\/\npublic class Processor {\n\u00a0 \u00a0 public Processor(String str, int i){\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"Constructor parameter: \" + str + \": \" + i);\n\u00a0 \u00a0 }\n\u00a0 \u00a0 public String print(String str){\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"Function invoke succeeded. Parameter: \" + str);\n\u00a0 \u00a0 \u00a0 \u00a0 return \"Return String.\";\n\u00a0 \u00a0 }\n}<\/pre>\n
<\/pre>\n
\/*---------------------------------------\u53cd\u5c04\u56de\u8c03\u3001\u6570\u7ec4\u4f20\u53c2-------------------------------------*\/<\/pre>\n
\/**\n\u00a0* Created by weizinan on 2017\/8\/23.\n\u00a0*\/\nimport java.lang.reflect.Constructor;\nimport java.lang.reflect.Method;\n\npublic class ReflectTest {\n\u00a0 \u00a0 public static void main(String[] args) throws Exception{\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u83b7\u53d6\u7c7b\n\u00a0 \u00a0 \u00a0 \u00a0 Class<?> c = Class.forName(\"Processor\");\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u8bbe\u5b9a\u6784\u9020\u51fd\u6570\u7684\u53c2\u6570\u7c7b\u578b\n\u00a0 \u00a0 \u00a0 \u00a0 Class<?>[] parTypes=new Class<?>[1];\n\u00a0 \u00a0 \u00a0 \u00a0 parTypes[0]=HandlerIntf.class;\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u83b7\u53d6\u6784\u9020\u5668\n\u00a0 \u00a0 \u00a0 \u00a0 Constructor<?> con = c.getConstructor(parTypes);\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u521d\u59cb\u5316\u6784\u9020\u53c2\u6570\n\u00a0 \u00a0 \u00a0 \u00a0 Object[] pars=new Object[1];\n\u00a0 \u00a0 \u00a0 \u00a0 pars[0]=new Handler();\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u6784\u9020\u5bf9\u8c61\n\u00a0 \u00a0 \u00a0 \u00a0 Object o=con.newInstance(pars);\n\u00a0 \u00a0 \u00a0 \u00a0 \/*\n\u00a0 \u00a0 \u00a0 \u00a0 \u83b7\u53d6\u67d0\u4e2a\u7279\u5b9a\u7684\u65b9\u6cd5\n\u00a0 \u00a0 \u00a0 \u00a0 \u901a\u8fc7\uff1a\u65b9\u6cd5\u540d+\u5f62\u53c2\u5217\u8868\n\u00a0 \u00a0 \u00a0 \u00a0 *\/\n\u00a0 \u00a0 \u00a0 \u00a0 Method m = c.getDeclaredMethod(\"print\",String.class);\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u8c03\u7528o\u5bf9\u8c61\u7684m\u65b9\u6cd5,\u4f20\u9012\u53c2\u6570\uff0c\u65b9\u6cd5\u7684\u6267\u884c\u7ed3\u679c\u662fretValue\n\u00a0 \u00a0 \u00a0 \u00a0 String retValue = (String)m.invoke(o, \"Hello World\");\n\n\u00a0 \u00a0 \u00a0 \u00a0 Method m1 = c.getDeclaredMethod(\"print_list\", String[].class, int.class, String[].class);\n\u00a0 \u00a0 \u00a0 \u00a0 String[] strList = new String[]{\"11\", \"22\", \"33\"};\n\u00a0 \u00a0 \u00a0 \u00a0 String[] strList1 = new String[]{\"aa\", \"bb\", \"cc\"};\n\u00a0 \u00a0 \u00a0 \u00a0 m1.invoke(o, new Object[]{strList, 1, strList1});\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(retValue);\n\u00a0 \u00a0 }\n}<\/pre>\n
\/**\n\u00a0* Created by weizinan on 2017\/8\/23.\n\u00a0*\/\npublic class Processor {\n\u00a0 \u00a0 public Processor(HandlerIntf handler){\n\u00a0 \u00a0 \u00a0 \u00a0 handler.print();\n\u00a0 \u00a0 \u00a0 \u00a0 handler.print1(\"Callback.\");\n\u00a0 \u00a0 }\n\n\u00a0 \u00a0 public String print(String str){\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"Function invoke succeeded. Parameter: \" + str);\n\u00a0 \u00a0 \u00a0 \u00a0 return \"Return String.\";\n\u00a0 \u00a0 }\n\n\u00a0 \u00a0 public void print_list(String[] strList, int i, String[] strList1){\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(i);\n\n\u00a0 \u00a0 \u00a0 \u00a0 for(String str : strList){\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 System.out.println(str);\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\n\u00a0 \u00a0 \u00a0 \u00a0 for(String str : strList1){\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 System.out.println(str);\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 }\n}<\/pre>\n
\/**\n\u00a0* Created by weizinan on 2017\/8\/23.\n\u00a0*\/\npublic class Handler implements HandlerIntf {\n\u00a0 \u00a0 @Override\n\u00a0 \u00a0 public void print() {\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"I'm Interface.\");\n\u00a0 \u00a0 }\n\n\u00a0 \u00a0 @Override\n\u00a0 \u00a0 public void print1(String str) {\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(str);\n\u00a0 \u00a0 }\n}<\/pre>\n
\/**\n\u00a0* Created by weizinan on 2017\/8\/23.\n\u00a0*\/\npublic interface HandlerIntf {\n\u00a0 \u00a0 void print();\n\u00a0 \u00a0 void print1(String str);\n}<\/pre>\n
<\/pre>\n
\/*-----------------------------\u53cd\u5c04\u8c03\u7528\u7236\u7c7b\u65b9\u6cd5--------------------------------*\/<\/pre>\n
\/**\n\u00a0* Created by weizinan on 2017\/8\/23.\n\u00a0*\/\nimport java.lang.reflect.Constructor;\nimport java.lang.reflect.Method;\n\npublic class ReflectTest {\n\u00a0 \u00a0 public static void main(String[] args) throws Exception{\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u83b7\u53d6\u7c7b\n\u00a0 \u00a0 \u00a0 \u00a0 Class<?> c = Class.forName(\"Subclass\");\n\u00a0 \u00a0 \u00a0 \u00a0 Class<?> c1 = Class.forName(\"Subclass\").getSuperclass();\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u83b7\u53d6\u6784\u9020\u5668\n\u00a0 \u00a0 \u00a0 \u00a0 Constructor<?> con = c.getConstructor();\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u6784\u9020\u5bf9\u8c61\n\u00a0 \u00a0 \u00a0 \u00a0 Object o=con.newInstance();\n\u00a0 \u00a0 \u00a0 \u00a0 \/*\n\u00a0 \u00a0 \u00a0 \u00a0 \u83b7\u53d6\u67d0\u4e2a\u7279\u5b9a\u7684\u65b9\u6cd5\n\u00a0 \u00a0 \u00a0 \u00a0 \u901a\u8fc7\uff1a\u65b9\u6cd5\u540d+\u5f62\u53c2\u5217\u8868\n\u00a0 \u00a0 \u00a0 \u00a0 *\/\n\u00a0 \u00a0 \u00a0 \u00a0 Method m = c1.getDeclaredMethod(\"print\", String.class);\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/\u8c03\u7528o\u5bf9\u8c61\u7684m\u65b9\u6cd5,\u4f20\u9012\u53c2\u6570\uff0c\u65b9\u6cd5\u7684\u6267\u884c\u7ed3\u679c\u662fretValue\n\u00a0 \u00a0 \u00a0 \u00a0 m.invoke(o, \"Hello World\");\n\n\u00a0 \u00a0 \u00a0 \u00a0 Method m1 = c.getDeclaredMethod(\"sub_print\", String.class);\n\u00a0 \u00a0 \u00a0 \u00a0 m1.invoke(o, \"Hello Son\");\n\u00a0 \u00a0 }\n}<\/pre>\n
\/**\n\u00a0* Created by weizinan on 2017\/8\/24.\n\u00a0*\/\npublic class Base {\n\u00a0 \u00a0 public void print(String str){\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"I'm your father. Paramter: \" + str);\n\u00a0 \u00a0 }\n}<\/pre>\n
\/**\n\u00a0* Created by weizinan on 2017\/8\/24.\n\u00a0*\/\npublic class Subclass extends Base {\n\u00a0 \u00a0 public void sub_print(String str){\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"I'm son. Parameter: \" + str);\n\u00a0 \u00a0 }\n}<\/pre>\n
<\/div>\n
<\/div>\n
<\/div>\n
\n","protected":false},"excerpt":{"rendered":"
\n\t\u4e00  \u53cd\u5c04\u673a\u5236\u7684\u6982\u5ff5:<\/strong><\/span>\n<\/p>\n
\n\t\u6307\u5728\u8fd0\u884c\u72b6\u6001\u4e2d,\u5bf9\u4e8e\u4efb\u610f\u4e00\u4e2a\u7c7b,\u90fd\u80fd\u591f\u77e5\u9053\u8fd9\u4e2a\u7c7b\u7684\u6240\u6709\u5c5e\u6027\u548c\u65b9\u6cd5,\u5bf9\u4e8e\u4efb\u610f\u4e00\u4e2a\u5bf9\u8c61,\u90fd\u80fd\u8c03\u7528\u5b83\u7684\u4efb\u610f\u4e00\u4e2a\u65b9\u6cd5.\u8fd9\u79cd\u52a8\u6001\u83b7\u53d6\u4fe1\u606f,\u4ee5\u53ca\u52a8\u6001\u8c03\u7528\u5bf9\u8c61\u65b9\u6cd5\u7684\u529f\u80fd\u53ebjava\u8bed\u8a00\u7684\u53cd\u5c04\u673a\u5236.<\/span>\n<\/p>\n
\n\t\u4e8c  \u53cd\u5c04\u673a\u5236\u7684\u5e94\u7528:<\/strong><\/span>\n<\/p>\n
\n\t\u751f\u6210\u52a8\u6001\u4ee3\u7406,\u9762\u5411\u5207\u7247\u7f16\u7a0b(\u5728\u8c03\u7528\u65b9\u6cd5\u7684\u524d\u540e\u5404\u52a0\u6808\u5e27).<\/span>\n<\/p>\n
\n\t\u4e09  \u53cd\u5c04\u673a\u5236\u7684\u539f\u7406:<\/strong><\/span>\n<\/p>\n
\n\t1  \u9996\u5148\u660e\u786e\u7684\u6982\u5ff5: \u4e00\u5207\u7686\u5bf9\u8c61—-\u7c7b\u4e5f\u662f\u5bf9\u8c61.<\/span>\n<\/p>\n
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