需求：定义一个员工类,自己分析出几个成员，然后给出成员变量，构造方法，getXxx()/setXxx()方法，以及一个显示所有成员信息的方法。并测试。

-Requirements: to define a class of employees, a few members of his own analysis, then give member variables, constructors, getXxx ()/setXxx () method, and a method of displaying information to all members. And testing.