动态代理（尚硅谷。宋红康）

 代理类和被代理类 必须实现同一套接口。

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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// 接口
public interface Star {
    void sing();
}

//目标对象
public class StarLiu implements Star {
    @Override
    public void sing() {
        System.out.println("刘德华唱歌");
    }
}

//代理对象
public class Agent {
    private Star target;
    public Agent(Star target) {
        this.target = target;
    }

    public Object getAgent(){
        return Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), new InvocationHandler() {
            @Override
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                System.out.println("签订合同");
                Object invoke = method.invoke(target,args);
                return invoke;
            }
        });
    }
}

// 测试类
public class ProxyTest {
    @Test
    public void test1(){
        Agent agent = new Agent(new StarLiu());
        Star star = (Star) agent.getAgent();
        star.sing();

    }
}