java - 异常捕获层次结构流程

Question

我正在 java 中实现带有多个异常的异常处理。

请看以下场景:函数 f1 抛出异常 e1、e2、e3 和 e4函数 f2 捕获这些。

现在我想通过catch(Exception e1 and e2)显式地捕获e1,e2，并且其他异常应该通过catch(Exception e)在同一个 block 中捕获所以e1和e2是特例，其他都是一般异常。

那么下面的方法会起作用吗？

try{
       //some work`
} catch(ExceptionType1 e1) {
      //do some special logging
} catch (ExceptionType2 e2) {
      //do some special logging
} catch(Exception e) {
     //do general logging for other exceptions
}

我的问题是ExceptionType1(e1)是否也会被Exception e捕获？

Answer 1

规范 writes :

If execution of the try block completes abruptly because of a throw of a value V, then there is a choice:

• If the run-time type of V is assignment compatible with (§5.2) a catchable exception class of any catch clause of the try statement, then the first (leftmost) such catch clause is selected. The value V is assigned to the parameter of the selected catch clause, and the Block of that catch clause is executed, and then there is a choice:

  • If that block completes normally, then the try statement completes normally.

  • If that block completes abruptly for any reason, then the try statement completes abruptly for the same reason.

因此，最多会执行一个catch block 。