实现程序模拟简单的企业职工管理系统。 (1) 请按图5-1的继承层次构建企业的各种职工类型，包括超类Employee，以及相应的子类Manager、Secretary和Programmer，从Manager继承又可得到Executive。 (2) 超类Employee有编号，姓名，年龄，薪金、地址和雇佣日期等信息。 (3) 用户可以根据职工编号或职工姓名查找所需的信息。 (4) 管理人员可以增加，删除数据。可以写入一个数据，查找一个数据，或删除一个数据。此外，管理人员可以增加或降低每个职工的薪金。

Employee
........\.classpath
........\.project
........\.settings
........\.........\org.eclipse.jdt.core.prefs
........\bin
........\...\Employee.class
........\...\EmpManager.class
........\...\Executive.class
........\...\Manager.class
........\...\Secretary.class
........\...\SystemMenu.class
........\src
........\...\Employee.java
........\...\EmpManager.java
........\...\Executive.java
........\...\Manager.java
........\...\Secretary.java
........\...\SystemMenu.java

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