java中带有finally子句的try/catch块返回

try/catch block return with finally clause in java(java中带有finally子句的try/catch块返回)

问题描述

鉴于以下 java 中的 try/catch 块:

Given the following try/catch block in java:

try{
  return;
}
catch(SomeException e){
  System.out.println(e);
}
finally{
  System.out.println("This is the finally block");
}

根据这篇文章:最终总是在 Java 中执行吗?" 我可以看到程序的输出将是 'This is the finally 块'.但是，我不知道这是怎么可能的，因为 print 语句前面有一个 return...

and according to this post: "Does finally always execute in Java?" I can see that the program's output will be 'This is the finally block'. However, I can't figure out how that would be possible since the print statement is preceded by a return...

我怀疑这种行为与线程有关，但我不确定.请赐教.谢谢.

I suspect that this behaviour has something to do with threading, however I am not certain. Please enlighten me. Thank you.

推荐答案

finally 在 return 语句之前执行.由于 java 规则 finally 将始终执行，除非 JVM 崩溃或调用 System.exit().

finally is executed before return statement. As java rule finally will always be executed except in case when JVM crashes or System.exit() is called.

Java语言规范明确提到finally在不同条件下的执行:

Java Language Specification clearly mentions the execution of finally in different conditions:

http://docs.oracle.com/javase/specs/jls/se7/html/jls-14.html#jls-14.20.2

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