代理模式

package com.day0131_3;
/*
 * 接口的应用：代理模式
 * 
 * 
 */
public class NetWorkTest {
  public static void main(String[] args) {
    Server server=new Server();
    ProxyServer proxyServer=new ProxyServer(server);
    proxyServer.browse();
  }
}
interface NetWork{
  public void browse();
}
//被代理类
class Server implements NetWork{
  @Override
  public void browse() {
    System.out.println("真实的服务器访问网络");
  }
}
 class ProxyServer implements NetWork{
  private NetWork work;
  public ProxyServer(NetWork work) {
    this.work=work;
  }
  public void check() {
    System.out.println("联网之前的检查工作");
  }
  @Override
  public void browse() {
    check();
    work.browse();
  }
}