java--代理设计模式

public class Main {
    public static void main(String[] args) {
        Subject subject = new RealSubject();
        ProxySubject proxy = new ProxySubject(subject);
        proxy.operate();
    }
}



//抽象主题,定义主要功能
interface Subject{
    public abstract void operate();
}

//真实主题
class  RealSubject implements Subject{
    public void operate(){
        System.out.println("realsubject 操作");
    }
}


//代理主题
class ProxySubject implements Subject{
    private Subject subject;
    public ProxySubject(Subject subject){
        this.subject = subject;
    }
    public void operate(){
        System.out.println("操作前");
        subject.operate();
        System.out.println("操作后");
    }
}