代理设计模式

interface Subject{ //核心操作主题
    public void get();//核心操作
}

class RealSubject implements Subject{
    @Override
    public void get() {
        System.out.println("取回钱款");
    }
}

class ProxySubject implements Subject{
    private Subject subject; //代理的真实主题
    public ProxySubject(Subject subject){
        this.subject = subject;
    }
    public void prepare(){
        System.out.println("准备工作");
    }
    @Override
    public void get() {
        this.prepare();
        this.subject.get(); //真实主题的工作内容
        this.destory();
    }
    public void destory(){
        System.out.println("收尾工作");
    }
}


public class ProxyDemo {
    public static void main(String[] args){
        Subject sub = new ProxySubject(new RealSubject());
        sub.get();
    }
}