代理模式

一、定义：为其他对象提供一种代理以控制对这个对象的访问。

二、示例代码：

//代理类和实际对象类共同实现的接口
public interface Subject {
    void dancing();

    void singing();
}

//实际对象类
public class RealObject implements Subject{
    @Override
    public void dancing() {
        System.out.println("跳舞");
    }

    @Override
    public void singing() {
        System.out.println("唱歌");
    }
}

//代理类
public class Proxy implements Subject {
    RealObject realObject;

    public Proxy() {
        realObject = new RealObject();
    }

    @Override
    public void dancing() {
        realObject.dancing();
    }

    @Override
    public void singing() {
        realObject.singing();
    }
}

//客户端类
public class Client {
    public static void main(String[] args) {
        Proxy proxy = new Proxy();
        proxy.dancing();
        proxy.singing();
    }
}