Polymorphic aspects of practice on the programming, content is based on the Employee type design some staff categories, manager of design, etc., so that different employees have different functions, easy to manage.

Employee
........\Driver.class
........\Driver.java
........\Driver.java.bak
........\Employee.class
........\Employee.java
........\Employee.java.bak
........\Hourly.class
........\Hourly.java
........\Hourly.java.bak
........\Manager.class
........\Manager.java
........\Manager.java.bak
........\Salesperson.class
........\Salesperson.java
........\Salesperson.java.bak
........\Staff.class
........\Staff.java
........\Staff.java.bak
........\Temporary.class
........\Temporary.java
........\Temporary.java.bak

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