23种设计模式之代理模式

代理模式：为其他对象提供一种代理以控制对这个对象的访问。

 

package designMode.proxy;

interface Subject {
    void request();
}

package designMode.proxy;

class RealSubject implements Subject{

    @Override
    public void request() {
        System.out.println("真实的请求！");
    }
    
}

package designMode.proxy;

class Proxy implements Subject{
    
    RealSubject realSubject;
    
    @Override
    public void request() {
        if(realSubject==null)
            realSubject=new RealSubject();
        realSubject.request();
    }

}

package designMode.proxy;

class Test {
    public static void main(String[] args) {
        Proxy p = new Proxy();
        p.request();
    }
}