如何避免finally块不执行的场景 [英] How to avoid a scenario in which finally block does not execute

问题描述

我在接受采访时被问到，当最后一块没有执行时。我回答说，当JVM在调用finally或调用System.exit（）之前突然关闭时。然后我被问到如何避免这种情况，以便我们的程序始终保持执行状态。应该处理这种情况。我们能处理这样的情况吗？如果有，怎么样？
提前致谢。

I was asked in an interview that when finally block does not execute. I replied that when JVM shuts down abruptly before the finally is called or when System.exit() is called. Then I was asked how can we avoid that scenario so that our program always remain executing. That is such a scenario should be handled. Can we handle such a scenario. If yes how? Thanks in advance.

推荐答案

即使最终失败但仍会执行shutdownhook。

Even finally fails but still shutdownhook will be executed.

答案是 -

Runtime#addShutdownHook

Java虚拟机关闭以响应两种
事件：

The Java virtual machine shuts down in response to two kinds of events:

• 当最后一个非守护程序线程退出或调用退出（等效，System.exit）方法时，程序正常退出，或者


• 虚拟机终止以响应用户中断，例如键入^ C或系统范围的事件，例如用户注销或
  
  系统关闭。

Java docs

代码 -

Runtime.addShutdownHook(new Thread {
  public void run() {
    System.out.println("Just before going down..");
  });

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