强制覆盖非抽象方法 [英] Force non-abstract method to be overridden

问题描述

我在抽象类中有一个方法 String foo() ，它已经做了一些预计算，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都必须以先调用 super() 然后计算结果的方式实现 foo.有没有办法在java中强制这样做?

解决方案

是的，通过重新设计以使用 模板方法模式并包括一个抽象方法:

公共抽象类 AbstractSuper {公共最终字符串 foo() {//也许在调用 bar 之前做一些事情...String initialResult = bar();//做一些常见的事情，例如验证返回初始结果；}受保护的抽象字符串 bar();}

基本上，如果你想强制子类覆盖一个方法，它确实必须是抽象的——但这不一定是被其他代码调用的方法......>

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?

解决方案

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();
}

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...

这篇关于强制覆盖非抽象方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！