求助，動態代理模式的困惑

package bbb;

import java.lang.reflect.*;
import java.util.*;

public class Test implements java.lang.reflect.InvocationHandler {
	private Object ob;
	
	public Test(Object oo) {
		ob = oo;	
	}	
	
	public static Object factory(Object oo) {
		Class cls = oo.getClass();
		Object o = Proxy.newProxyInstance(cls.getClassLoader(),cls.getInterfaces(),new Test(oo));
//		System.out.println(o.getClass()); //此處的對像是Proxy?????
		return o;	
	}
	
	public Object invoke(Object proxy, Method method, Object[] args) throws Throwable 
	{
		//System.out.println("我讓代理了");	
		Object o = method.invoke(ob,args);

		return o;
	}
	
	public static void main(String args[]) throws Exception {
    	Object oo = factory(new TTT()); //如果factory是Proxy,如何轉型成Good?
    	System.out.println(oo.getClass().getName());
    	Proxy v = (Proxy)oo;
    	System.out.println(v);
    	Good f = (Good)v;
    	f.ff();
    }
}

interface Good {
	void ff();	
}

class TTT implements Good {
	public void ff() {}
}
	

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