引用抽象类 [英] reference to abstract class

问题描述

当有一个抽象类的引用时，是什么意思？
我在代码中找到它，我不能低估它。

What does it mean when there is a reference to an abstract class? I found it in code and I can't understant it.

我认为抽象类不能被实例化。

I thought that an abstract class can't be instantiated. How can you give it a reference?

推荐答案

对抽象类的引用就像是一个指向抽象类的指针：需要引用抽象类的一些非抽象子类的对象。您可以使用类似于Java中的接口的指针，使用。语法，在引用类上调用virtual方法。

A reference to an abstract class is just like a pointer to an abstract class: it needs to reference an object of some non-abstract subclass of the abstract class. You can use a reference like that to call virtual methods on the referenced class using the . syntax, in a way similar to a pointer to an interface in Java.

这篇关于引用抽象类的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！