9.4 Relationship Between Superclasses and Subclasses
We now use an inheritance hierarchy containing types of employees in a company’s payroll application to discuss the relationship between a superclass and its subclass. In this company, commission employees (who will be represented as objects of a superclass) are paid a percentage of their sales, while base-salaried commission employees (who will be represented as objects of a subclass) receive a base salary plus a percentage of their sales.
We divide our discussion of the relationship between these classes into five examples. The first declares class CommissionEmployee, which directly inherits from class Object and declares as private instance variables a first name, last name, social security ...
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