接口

public interface Cc {

   void say();

}

实现类：

public class C  implements  Cc{

    @Override

    public void say() {

        System.out.println("good");

    }

}

代理类：

public class ProxyTest implements InvocationHandler {

    //真实对象

    private Cc targent;

    public Cc  getPerson(Cc targent){

        this.targent=targent;

        Class<?> clazz=targent.getClass();

        return (Cc) Proxy.newProxyInstance(clazz.getClassLoader(),clazz.getInterfaces(),this);

    }

    @Override

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

        Object obj = method.invoke(this.targent, args);

        return obj;

    }

}

测试结果：

     ProxyTest proxyTest=new ProxyTest();

//只对Cc接口进行代理

        Cc cc = proxyTest.getPerson(new C());

        cc.say();