实例是为子类异常工作吗？ [英] does instanceof work for subclassed exceptions?

问题描述

java.net.ConnectException extends java.net.SocketException

java.net.ConnectException extends java.net.SocketException

如果我执行以下操作，它是否适用于这两个例外？即如果我使用 instanceof 捕获父异常，那么是否包含任何子类异常？

If I do the following, will it cater for both exceptions? ie if I catch a "parent" exception using instanceof, does that include any subclassed exceptions?

catch (Exception e)
{
   if (e instanceof java.net.SocketException)
   {
      System.out.println("You've caught a SocketException, OR a ConnectException");
   }
}

（为了纪录，是的，我知道捕捉平原例外是坏的，只是使用它为这个例子;））

(and for the record, yes I know catching plain Exceptions is bad, just using it for this example ;) )

推荐答案

异常是常规类，所以 instanceof 可以正常工作。

Exceptions are regular classes, so instanceof works fine for them.

但是你不需要这样的东西。以下实现相同的结果：

But you don't need such a thing. The following achieves the same result:

try {
    throw new ConnectException();
} catch (SocketException e) {
    System.out.println("You've caught a SocketException, OR a ConnectException");
}

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