定义员工类Employee以及它的继承类Manager和Director，里面包含员工相应的信息以及修改信息和获得信息的函数。定义一个抽象类Payment，工资Salary、奖金Bonus、股票分红Option均为Payment的子类。-Define the Employee class Employee and its inherited classes Manager and Director, which contains the corresponding information of staff as well as modify the function of information and access to information. Defines an abstract class Payment, pay the Salary, Bonus Bonus, stock dividends Option are Payment subclass.