String s = "HelloWorld"; 

Object o = someMethod(); 

((HelloWorld)o).sayHello(s);

------解决方案--------------------

Java code
 
 package com.train.first; 
  
 import java.lang.reflect.Method; 
  
 public class Test 
 { 
 	public static void main(String[] args) throws Exception 
 	{ 
 		String clazz = "Hello"; 
 		Object obj = getHello(); 
 		 
 		if (null == obj) 
 		{ 
 			return; 
 		} 
 		 
 		Class c = obj.getClass(); 
 		 
 		if (c.getInterfaces().length > 0) 
 		{ 
 			for (int i = 0; i  < c.getInterfaces().length; i++) 
 			{ 
 				if (clazz.equals(c.getInterfaces()[i].getSimpleName())) 
 				{ 
 					Method m = c.getMethod("sayHello", new Class[]{String.class}); 
 					 
 					m.invoke(obj, "God"); 
 					 
 					break; 
 				} 
 			} 
 		} 
 		 
 	} 
 	 
 	private static Object getHello() 
 	{ 
 		return new HelloImpl(); 
 	} 
 } 
  
 interface Hello 
 { 
 	public void sayHello(String name); 
 } 
  
 class HelloImpl implements Hello 
 { 
 	public void sayHello(String name) 
 	{ 
 		System.out.println("Hello, " + name); 
 	} 
 } 
 


------解决方案--------------------
探讨

Java code
package com.train.first;

import java.lang.reflect.Method;

public class Test
{
    public static void main(String[] args) throws Exception
    {
        String clazz = "Hello";
        Object obj = getHello();
        
        if (null == obj)
        {
            return;
        }
        
        Class c = obj.getClass();
        
        if (c.getInterfaces().le…


------解决方案--------------------
4楼正解