February 2014
Beginner
1248 pages
62h 25m
English
Content preview from Java™ How To Program (Early Objects), Tenth Edition
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10.5.6 Polymorphic Processing, Operator instanceof and Downcasting
To test our Employee hierarchy, the application in Fig. 10.9 creates an object of each of the four concrete classes SalariedEmployee, HourlyEmployee, CommissionEmployee and BasePlusCommissionEmployee. The program manipulates these objects nonpolymorphically, via variables of each object’s own type, then polymorphically, using an array of Employee variables. While processing the objects polymorphically, the program increases the base salary of each BasePlusCommissionEmployee by 10%—this requires determining the object’s type at execution time. Finally, the program polymorphically determines and outputs the type of each object in the Employee array. Lines 9–18 create objects of ...
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