Java：强制实现覆盖toString的设计接口

问题描述

我正在开发一个SPI，并希望定义一个可报告的接口，这样任何实现都必须覆盖 toString（）到有意义的东西。

I'm developing an SPI and would like to define a Reportable interface such that any implementations must override toString() to something that is meaningful.

在Java中有没有办法编写一个接口，使得它的任何具体实现必须覆盖Object的的toString（）？例如：

Is there any way in Java to write an interface such that any of its concrete implementations must override Object's toString()? For instance:

public interface Reportable
{
    public String toString();
}

public class Widget implements Fizz, Buzz, Reportable
{
    // ...

    @Override
    public String toString()
    {
        // ...
    }
}

我知道上面的代码没有强制这种行为，但是我正在寻找的一个例子，即如果 Widget 不会覆盖 toString（）您收到编译错误，因为它违反了接口合同。

I know the above code doesn't force this kind of behavior, but is an example of what I'm looking for, i.e. if Widget doesn't override toString() you get a compile error because its violating the interface contract.

推荐答案

不，你不能这样做。我建议您选择不同的方法名称，例如

No, you can't do this. I'd suggest you choose a different method name, e.g.

public interface Reportable
{
    String createReport();
}

这将强制实现编写适当的方法。 toString（）的意图已经有些模糊 - 无论是用于调试表示，用户可见的表示（此时你需要问自己有关语言环境等）。添加另一个意义对我来说似乎不是一个好主意。

That will force implementations to write an appropriate method. toString() is already somewhat vague in its intention - whether it's for debug representations, user-visible representations (at which point you need to ask yourself about locales etc). Adding another meaning doesn't seem like a good idea to me.

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