public interface People {

    public void work();

}

public class RealPeople implements People {

    public void work() {

        System.out.println("工作中...");

    }

}

/**

 * 代理类

 *

 */

public class Proxy implements People {

    private RealPeople realPeople;

    public Proxy(RealPeople realPeople) {

        this.realPeople = realPeople;

    }

    public void work() {

        System.out.println("before work...");

        realPeople.work();

        System.out.println("after work...");

    }

}

public class ProxyTest {

    public static void main(String[] args) {

        Proxy proxy = new Proxy(new RealPeople());

        proxy.work();

    }

}