How to: Create User-Defined Exceptions.

如何：创建用户定义的异常。

youdao

This is true for all built-in exceptions, but need not be true for user-defined exceptions (although it is a useful convention).

对于所有的内置异常都是如此，不过用户自定义异常就不一定了(尽管这是一个很有用的约定)。

youdao

Exceptions cannot be used as data members of user-defined types.

异常不能当作用户定义类型的数据成员使用。

youdao

This is an example of yet another source of inconsistency in nomenclature: despite scientists' best efforts to fit things into well-defined categories, there are always exceptions and special cases.

ECONOMIST: Today we have naming of parts