February 2014
Beginner
1248 pages
62h 25m
English
Content preview from Java™ How To Program (Early Objects), Tenth Edition
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Exercises
9.3 (Using Composition Rather Than Inheritance) Many programs written with inheritance could be written with composition instead, and vice versa. Rewrite class BasePlusCommissionEmployee (Fig. 9.11) of the CommissionEmployee–BasePlusCommissionEmployee hierarchy to use composition rather than inheritance.
9.4 (Software Reuse) Discuss the ways in which inheritance promotes software reuse, saves time during program development and helps prevent errors.
9.5 (Student Inheritance Hierarchy) Draw an inheritance hierarchy for students at a university similar to the hierarchy shown in Fig. 9.2. Use Student as the superclass of the hierarchy, then extend Student with classes UndergraduateStudent and GraduateStudent. Continue to extend the hierarchy ...
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