23种设计模式之代理模式

packagedesignMode.proxy;
interfaceSubject {
    voidrequest();
}

packagedesignMode.proxy;
class RealSubject implementsSubject{
    @Override
    public voidrequest() {
        System.out.println("真实的请求！");
    }
}

packagedesignMode.proxy;
class Proxy implementsSubject{
    RealSubject realSubject;
    @Override
    public voidrequest() {
        if(realSubject==null)
            realSubject=newRealSubject();
        realSubject.request();
    }
}

packagedesignMode.proxy;
classTest {
    public static voidmain(String[] args) {
        Proxy p = newProxy();
        p.request();
    }
}