代理(委托)模式

1. 主题抽象类或接口

public interface ISubject {
     void doSomething();
     void doAnything();
}

2. 主题抽象类或接口实际类

public class RealSubject implements ISubject{
    @Override
    public void doSomething() {
        //具体逻辑
    }
    @Override
    public void doAnything() {
        //具体逻辑
    }
}

3. 主题抽象类或接口代理类

public class ProxySubject implements ISubject {
    ISubject realSubject = null;
    public ProxySubject(ISubject subject) {
        this.realSubject = subject;
    }
    @Override
    public void doSomething() {
        this.realSubject.doSomething();
    }
    @Override
    public void doAnything() {
        this.realSubject.doAnything();
    }
}

4. 使用

    ISubject realSubject = new RealSubject();
    ISubject proxySubject = new ProxySubject(realSubject);
    proxySubject.doSomething();
    proxySubject.doAnything();