在 Java 7 多捕获块中，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

在 Java 7 多捕获块中，如下所示:

In a Java 7 multicatch block such as the following:

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

ex 的编译时类型是什么?它是两种异常类型共有的最派生类吗?在此示例中，这将是一个 IOException.

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.

推荐答案

是的，ex 的类型是 CharacterCodingException 和 UnknownServiceException 最具体的超类型，即 IOException.

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

直接从马嘴里http://cr.openjdk.java.net/~darcy/ProjectCoin/ProjectCoin-Documentation-v0.83.html#multi_catch:

非正式地，lub(最小上限)是所讨论类型中最具体的超类型.

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

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