import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

public class RelectTests {

    public static void main(String[] args) {
        Hello hello1 = (Hello) Proxy.newProxyInstance(Hello.class.getClassLoader(), new Class[] { Hello.class },
                new MyInvocationHandler(new MyHello()));
        
        hello1.sayHello("Kitty!");
        
        Hello hello2 = (Hello) Proxy.newProxyInstance(Hello.class.getClassLoader(), new Class[] { Hello.class },
                new MyInvocationHandler(new YourHello()));
        
        hello2.sayHello("Kitty!");

    }

}


interface Hello{
    void sayHello(String name);
}

class MyHello implements Hello{

    @Override
    public void sayHello(String name) {
        System.out.println("Hello!, My name is " + name);        
    }    
}

class YourHello implements Hello{

    @Override
    public void sayHello(String name) {
        System.out.println("Hello!, Your name is " + name);        
    }
    
}

class MyInvocationHandler implements InvocationHandler{
    
    private Object delegate;
    
    MyInvocationHandler(Object subject){
        this.delegate = subject;
    }
    

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        Object result = null;
        System.out.println("Method start");
        result = method.invoke(this.delegate, args);
        System.out.println("Method end");
        return result;
    }
    
}