多重返回:哪一个设置最终返回值?

2022-01-19 00:00:00 return java finally

鉴于此代码:

String test() {
    try {
        return "1";
    } finally {
        return "2";
    }
}

语言规范是否定义了调用 test() 的返回值?换句话说:在每个 JVM 中它总是相同的吗?

Do the language specifications define the return value of a call to test()? In other words: Is it always the same in every JVM?

在 Sun JVM 中，返回值为 2，但我想确定，这与 VM 无关.

In the Sun JVM the return value is 2, but I want to be sure, that this is not VM-dependant.

推荐答案

是的，语言规范定义2"是结果.如果 VM 的做法有所不同，则说明它不符合规范.

Yes, the language spec defines that "2" is the result. If a VM does it differently, it's not spec-compliant.

大多数编译器都会抱怨它.例如 Eclipse 会声称返回块永远不会被执行，但这是错误的.

Most compilers will complain about it. Eclipse, for example, will claim that the return block will never be executed, but it's wrong.

编写这样的代码是非常糟糕的做法，永远不要这样做:)

It's shockingly bad practice to write code like that, don't ever do it :)

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