Java How to Program, Early Objects, 11th Edition

Exercises

1. 9.3 (Recommended: Using Composition Rather Than Inheritance) Many programs written with inheritance could be written with composition instead, and vice versa. Rewrite class BasePlus–CommissionEmployee (Fig.9.11 ) of the CommissionEmployee–BasePlusCommissionEmployee hierarchy so that it contains a reference to a CommissionEmployee object, rather than inheriting from class CommissionEmployee. Retest BasePlusCommissionEmployee to demonstrate that it still provides the same functionality.

2. 9.4 (Software Reuse) Discuss the ways in which inheritance promotes software reuse, saves time during program development and helps prevent errors.

3. 9.5 (Student Inheritance Hierarchy) Draw an inheritance hierarchy for students at a university similar ...