本文给出一个关于继承性的综合例子，该例子编写一个有关日期(年、月、日)和时间(时、分、秒)的程序。该程序建立三个类，其中一个是日期的类Date，一个是时间的类Time，另一个是日期和时间类DateTime，它是前面两个类为基类的派生类。

-This paper presents a comprehensive example of inheritance, the examples of the preparation of a date (year, month, day) and time (hour, minute, second) procedures. The program to establish three categories, one of which is the date of the class Date, a category was a matter of time Time, date and time the other is the type of DateTime, which is in front of the two categories for the base class of derived classes.