为什么finally中的代码即使在try块中返回了也会执行？
代码： <代码>
public String get() {
try {
//doSomething
return "Hello";
}
finally {
System.out.print("Finally");
}
<代码> 这段代码是如何执行的呢？
Code:
public String get() {
try {
//doSomething
return "Hello";
}
finally {
System.out.print("Finally");
}
How does this code execute?
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评论（3）
因为这就是
finally块的全部要点 - 无论您离开try块，它都会执行，除非虚拟机本身突然关闭。通常，
finally块用于清理资源 - 您不会希望仅仅因为在try块期间返回而使文件句柄保持打开状态，不是吗？现在，您可以将该清理代码放在 return 语句之前 - 但如果代码抛出异常，则不会清理它。使用finally，清理代码将执行但是您离开该块，这通常是您想要的。请参阅 JLS 第 14.20.2 节更多细节 - 并注意所有路径如何涉及
finally块的执行。Because that's the whole point of a
finallyblock - it executes however you leave thetryblock, unless the VM itself is shut down abruptly.Typically
finallyblocks are used to clean up resources - you wouldn't want to leave a file handle open just because you returned during thetryblock, would you? Now you could put that clean-up code just before the return statement - but then it wouldn't be cleaned up if the code threw an exception instead. Withfinally, the clean-up code executes however you leave the block, which is generally what you want.See JLS section 14.20.2 for more details - and note how all paths involve the
finallyblock executing.最后，无论 try 块中发生什么（失败、返回、异常、完成等），ALWAYS 都会被执行。
如果您不希望执行此代码，可以随时将其放在 try/catch/finally 语句之后。
Finally ALWAYS gets executed, no matter what happens in the try block (fail, return, exception, finish etc.).
If you don't want this code to be executed, you could always placed it after the try/catch/finally statement.
这正是
finally的用途：当try块离开时，内部的代码将执行，无论如何（除了通过 JVM 关闭）System.exit()或外部原因）。That's exactly what
finallyis for: the code inside will execute when thetryblock is left, no matter how (except the JVM shutting down viaSystem.exit()or external reasons).