反射机制实现方法调用

import java.lang.reflect.*;class Person{public void sayBye(){System.out.println("bye bye");}public void sayHello(String name){System.out.println("hello "+name);}public void sayWelcome(String name,String address){System.out.println("welcome "+name+" to "+address);}}public class Demo{public static void main(String [] args) throws Exception{Object obj=Class.forName(args[0]).newInstance();String [] str=null;if(args.length>=3)str=args[2].split(",");        invokeMethod(obj,args[1],str);}public static Object invokeMethod(Object obj,String methodName,Object[] args) throws Exception{Class [] argsClass = null;if(args!=null){argsClass=new Class[args.length];for(int i=0;i<argsClass.length;i++)argsClass[i]=args[i].getClass();}Method method=obj.getClass().getMethod(methodName,argsClass);return method.invoke(obj,args);}}