Java Note 10: Reflection in java

　　

A Object String s = "aaa" a = 3 Integer B = Integer (4 A (abc (0 System. out. println ("actionreceivmed ()" f1 (f2 (main (String [] args) A a = Class c = Field [] fields = c. getFields (); (I = 0; I <fields. length; I ++ Class c1 = fields [I]. getType (); System. out. println ("private attribute in the reflection class" Field f = c. getDeclaredField ("a" f. setAccessible (); System. out. println (f. get ());}

              main(String[] args)          Class c = A.         String className = c.getName();         Constructor[] cons = c.getConstructors();            ( i = 0; i < cons.length; i++             Class[] parameterTypes =             System.out.print(className+"("              ( j = 0; j < parameterTypes.length; j++                 System.out.print(parameterTypes[j].getName()+" "              System.out.print(")"           Constructor con = c.getConstructor(.,String.);      }

                     Class c = A.                  Class[] interfaces =          ( i = 0; i < interfaces.length; i++                    Class superClass =   }

               main(String[] args)          Class c = A.         A a =                   Method[] methods = c.getMethods();            ( i = 0; i < methods.length; i++                                        System.out.print(" "+methods[i].getName()+"("                          Class[] paramTypes =              ( j = 0; j < paramTypes.length; j++                  (paramTypes.length>j+1                     System.out.print(","               System.out.print(")"                    Method m = c.getDeclaredMethod("f2",.);                   m.setAccessible(         m.invoke(a, 5   }

C. getDeclaredMethod (String methodName, Class param): to obtain a specific method, enter the method name and method parameters.