强制重写非抽象方法 [英] Force non-abstract method to be overridden

问题描述

我在一个抽象类中有一个方法 String foo（），它已经进行了一些预计算，但无法提供该方法应该返回的最终结果。所以我想要的是，从我的抽象类继承的每个非抽象类必须以第一个 super（） foo 调用c $ c>然后计算结果。有没有办法在java中强制执行此操作？

I have a method String foo() in an abstract class which already does a few precomputations but can't deliver the final result the method is supposed to return. So what I want is that each non-abstract class inheriting from my abstract class has to implement foo in a way that first super() is called and then the result is computed. Is there a way to force this in java?

推荐答案

是的，通过重新设计使用模板方法模式并包含一个抽象方法：

Yes, by redesigning to use the template method pattern and including an abstract method:

public abstract class AbstractSuper {
    public final String foo() {
        // Maybe do something before calling bar...
        String initialResult = bar();
        // Do something common, e.g. validation
        return initialResult;
    }

    protected abstract String bar();
}

基本上如果要强制子类覆盖方法，它 必须是抽象的 - 但这不一定是其他代码调用的方法...

Basically if you want to force subclasses to override a method, it does have to be abstract - but that doesn't have to be the method that is called by other code...

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