java中 抛出异常用户如果需要，也可以自己抛出异常。被抛出的异常对象既可以是系统定义的异常类，也可以是用户自己定义的新的异常类。一般格式如下：



throw 异常对象名 或者 throw new 异常类名() -java exception thrown if the user can also throw their own exceptions. Exception object is thrown can be either system-defined exception class, it can be a new user-defined exception classes. General format is as follows: throw Exception object name　or throw new Exception Class Name ()