定义一个没有任何抽象方法的抽象类 [英] Defining an abstract class without any abstract methods

问题描述

我可以定义一个抽象类而不添加抽象方法吗?

Can I define an abstract class without adding an abstract method?

推荐答案

当然.

声明一个抽象类仅仅意味着你不允许它自己被实例化.

Declaring a class abstract only means that you don't allow it to be instantiated on its own.

声明方法抽象意味着子类必须为该方法提供实现.

Declaring a method abstract means that subclasses have to provide an implementation for that method.

这两个是不同的概念，但显然你不能在非抽象类中拥有抽象方法.你甚至可以拥有带有 final 方法的抽象类，但不能反过来.

The two are separate concepts, though obviously you can't have an abstract method in a non-abstract class. You can even have abstract classes with final methods but never the other way around.

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