多次返回:哪一个设置最终返回值? [英] Multiple returns: Which one sets the final return value?
问题描述
鉴于此代码:
String test() {
try {
return "1";
} finally {
return "2";
}
}
语言规范是否定义了呼叫的返回值到 test()
?换句话说:每个JVM中它总是一样的吗?
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,返回值是 2
,但我想确定,这不是VM -dependant。
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以不同方式执行,则不符合规范。
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将声称返回块永远不会被执行,但它是错误的。
Most compilers will complain about it. Eclipse, for example, will claim that the return block will never be executed, but it's wrong.
编写类似的代码这是一个令人震惊的糟糕做法,不要做它:)
It's shockingly bad practice to write code like that, don't ever do it :)
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