对抽象类的引用 [英] reference to abstract class

问题描述

引用抽象类是什么意思?我在代码中发现了它，我无法理解它.

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.怎么给个参考?

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一个指向抽象类的指针:它需要引用抽象类的某个非抽象子类的对象.您可以使用类似的引用来使用 . 语法调用被引用类上的虚拟方法，其方式类似于 Java 中指向接口的指针.

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.

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