我可以在同一个 catch 子句中捕获多个 Java 异常吗? [英] Can I catch multiple Java exceptions in the same catch clause?

问题描述

在 Java 中，我想做这样的事情:

In Java, I want to do something like this:

try {
    ...     
} catch (/* code to catch IllegalArgumentException, SecurityException, 
            IllegalAccessException, and NoSuchFieldException at the same time */) {
   someCode();
}

...而不是:

try {
    ...     
} catch (IllegalArgumentException e) {
    someCode();
} catch (SecurityException e) {
    someCode();
} catch (IllegalAccessException e) {
    someCode();
} catch (NoSuchFieldException e) {
    someCode();
}

有没有办法做到这一点?

Is there any way to do this?

推荐答案

这已经成为可能 自 Java 7.multi-catch 块的语法是:

This has been possible since Java 7. The syntax for a multi-catch block is:

try { 
  ...
} catch (IllegalArgumentException | SecurityException | IllegalAccessException |
            NoSuchFieldException e) { 
  someCode();
}

但是请记住，如果所有异常都属于同一个类层次结构，则您可以简单地捕获该基本异常类型.

Remember, though, that if all the exceptions belong to the same class hierarchy, you can simply catch that base exception type.

另请注意，如果 ExceptionB 直接或间接地从 ExceptionA 和 ExceptionB代码>异常A.编译器会抱怨:

Also note that you cannot catch both ExceptionA and ExceptionB in the same block if ExceptionB is inherited, either directly or indirectly, from ExceptionA. The compiler will complain:

Alternatives in a multi-catch statement cannot be related by subclassing
  Alternative ExceptionB is a subclass of alternative ExceptionA

解决这个问题的方法是只在异常列表中包含祖先异常，因为它也会捕获后代类型的异常.

The fix for this is to only include the ancestor exception in the exception list, as it will also catch exceptions of the descendant type.

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