在Java 7的多块块中，捕获的异常的类型是什么？ [英] In a Java 7 multicatch block what is the type of the caught exception?

问题描述

  try {
 //引发异常的代码
} catch（CharacterCodingException | UnknownServiceException ex）{
 // handle exception 
} 
  

ex 的编译时类型是什么？这是两个异常类型有最常见的派生类吗？在这个例子中，这将是一个 IOException 。

解决方案

是的， ex 的类型是 CharacterCodingException 和 UnknownServiceException ，这将是 IOException 。

编辑：直接从马的嘴在 http://cr.openjdk.java .net /〜darcy / ProjectCoin / ProjectCoin-Documentation-v0.83.html＃multi_catch ：

非常地， （最小上限）是所讨论类型的最具体的超类型。

In a Java 7 multicatch block such as the following:

try {
    // code that throws exception
} catch (CharacterCodingException | UnknownServiceException ex) {
    // handle exception
}

what is the compile-time type of ex? Is it the most derived class that both exception types have in common? In this example that would be an IOException.

解决方案

Yes, the type of ex is the most specific supertype of both CharacterCodingException and UnknownServiceException, which would be IOException.

Edit: Straight from the horse's mouth on http://cr.openjdk.java.net/~darcy/ProjectCoin/ProjectCoin-Documentation-v0.83.html#multi_catch:

Informally, the lub (least upper bound) is the most specific supertype of the types in question.

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