需要覆盖方法才能调用super [英] Require override of method to call super

问题描述

我希望当子类重写父类中的方法时，在该子方法中调用 super.method（）。

I want that when a child class overrides a method in a parent class, the super.method() is called in that child method.

有没有办法在编译时检查这个？

如果没有，当发生这种情况时，如何抛出运行时异常？

Is there any way to check this at compile time?
If not, how would I go about throwing a runtime exception when this happens?

推荐答案

没有办法直接要求这个。但是，你可以做的是：

There's no way to require this directly. What you can do, however, is something like:

public class MySuperclass {
    public final void myExposedInterface() {
        //do the things you always want to have happen here

        overridableInterface();
    }

    protected void overridableInterface() {
        //superclass implemention does nothing
    }
}

public class MySubclass extends MySuperclass {
    @Override
    protected void overridableInterface() {
        System.out.println("Subclass-specific code goes here");
    }
}

这提供了一个子类可以使用的内部接口点向公共 myExposedInterface（）方法添加自定义行为，同时确保始终执行超类行为，无论子类做什么。

This provides an internal interface-point that subclasses can use to add custom behavior to the public myExposedInterface() method, while ensuring that the superclass behavior is always executed no matter what the subclass does.

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