如何不抛出一般指定的异常？ [英] How to not throw a generically specified exception?

问题描述

我创建了一个生产者界面（与方法引用一起使用，分别用于单元测试的模拟）：

I created a "producer" interface (to be used with method references, respectively to be easily mocked for unit tests):

@FunctionalInterface
public interface Factory<R, T, X extends Throwable> {
    public R newInstanceFor(T t) throws X;
}

我是这样创建的，因为我的第一个用例实际上必须抛出一些选中 WhateverException 。

which I created like that, as my first use case actually had to throw some checked WhateverException.

但我的第二个用例没有投掷X.

But my second use case doesn't have an X to throw.

我能想出的让编译器满意的最好方法是：

The best I could come up with to make the compiler happy is:

Factory<SomeResultClass, SomeParameterClass, RuntimeException> factory;

编译，做我需要的，但仍然很难看。有没有办法保留单个接口，但在声明特定实例时不提供X？

That compiles, and does what I need, but still ugly. Is there a way to keep that single interface, but not provide an X when declaring specific instances?

推荐答案

唯一的办法它是子类 - 但我打赌你知道这一点。为了使我的论证更强大，请查看扩展 BiFunction 的 BinaryOperator 。

The only way to do it is subclassing - but I bet you knew that. To make my argument stronger, look at BinaryOperator that extends BiFunction.

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