基类和派生类的一个题目,我是不是做错了??? ... class User //定义系统用户类 class FinUser:User //定义财务人员类 class CusUser:User //定义客服人员类 ...
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上述所有这些根据操作系统类型和修订版本、一天中的时间、任意用户定义的类、文件中文件、目录或数据的有无等等可以是有条件的。
All of the above can be conditional upon the operating system type and revision, time of day, arbitrary user-defined classes, presence or absence of files, directories, or data in files, and so on.
例如,系统类是不可修改的,而用户定义接口类虽然可以修改,但是不能包含实际的实现代码。
System classes, for instance, are not modifiable, while user-defined interface classes can be modified, but can't include actual implementation code.
类a在系统类装入器的类路径中,而A的超类b,在用户自定义的类装入器的类路径中,这个类装入器是系统类装入器的孩子。
Class a is on the classpath of the system class loader, and a's superclass, B, is on the classpath of a user-defined class loader, which is a child of the system class loader.
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