Java™ How To Program (Early Objects), Tenth Edition

9.4.3 Creating a CommissionEmployee–BasePlusCommissionEmployee Inheritance Hierarchy

Now we declare class BasePlusCommissionEmployee (Fig. 9.8) to extend class CommissionEmployee (Fig. 9.4). A BasePlusCommissionEmployee object is a CommissionEmployee, because inheritance passes on class CommissionEmployee’s capabilities. Class BasePlusCommissionEmployee also has instance variable baseSalary (Fig. 9.8, line 6). Keyword extends (line 4) indicates inheritance. BasePlusCommissionEmployee inherits CommissionEmployee’s instance variables and methods.

Click here to view code image

 1   // Fig. 9.8: BasePlusCommissionEmployee.java 2   // private superclass members cannot be accessed in a subclass. 3  4   public class BasePlusCommissionEmployee extends ...