如何强制在Java中重写方法? [英] How to force a method to be overridden in java?

问题描述

我必须创建许多非常相似的类，它们之间只有一种方法不同.因此，我认为创建抽象类将是实现此目标的好方法.但是我要覆盖的方法(例如，方法foo())没有默认行为.我不想保留任何默认实现，而是强制所有扩展类都实现此方法.我该怎么做?

I have to create a lot of very similar classes which have just one method different between them. So I figured creating abstract class would be a good way to achieve this. But the method I want to override (say, method foo()) has no default behavior. I don't want to keep any default implementation, forcing all extending classes to implement this method. How do I do this?

推荐答案

您需要在基类上使用抽象方法:

You need an abstract method on your base class:

public abstract class BaseClass {
    public abstract void foo();
}

这样，您无需指定默认行为，并且您将强制从 BaseClass 继承的非抽象类指定 foo .

This way, you don't specify a default behavior and you force non-abstract classes inheriting from BaseClass to specify an implementation for foo.

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