为什么装饰器和代理中的引用分别指向其主题的界面和具体的？ [英] Why do the references in a decorator and in a proxy point to their subject's interface and concrete respectively?

问题描述

由四人组成的设计模式

为什么装饰器的引用组件 指向装饰器的装饰器指向装饰器的接口组件

Why does the reference component of the decorator Decorator to the decorated point to the interface Component of the decorated,

而代理<$ c的引用 realSubject $ c>代理指向具体的 RealSubject ？

while the reference realSubject of the proxy Proxy point to the concrete RealSubject?

谢谢。

推荐答案

代理可能仅指向其主题的界面。 GoF提到，

Proxy may point exclusively to its subject's interface. The GoF mentions,

代理可能是指如果 RealSubject 和 Subject 接口相同，则为Subject 。

Proxy may refer to a Subject if the RealSubject and Subject interfaces are the same.

但是根据实现的不同，代理可以通过调用构造函数来实例化其主题，而构造函数则需要引用一个具体对象。

But depending on implementation, a Proxy may instantiate its subject by calling a constructor, which necessitates referencing a concrete object.

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