代理模式

代码示例：

interface NetWork{
    public void browse();
}
//被代理类
class Server implements NetWork{
    public void browse(){
        System.out.println("真实的服务器访问网络");
    }
}
//代理类
class ProxyServer implements NetWork{
    private NetWork work;

    public ProxyServer(NetWork work){
        this.work = work;
    }
    public void chek(){
        System.out.println("联网之前的检查工作");
    }
    public void browse(){
        chec();
        work.browse();
    }
}

public class ProxyTest {
    public static void main(String[] args) {
        Server server = new Server();
        ProxyServer pro = new ProxyServer(server);
        pro.browse();
    }
}

运行结果