Software Engineering for Students A Programming Approach

148 Chapter 11 ■ Object-oriented design
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Exercises
11.1 Complete the design of the game presented in the chapter. In particular, establish
use cases and hence identify the methods associated with each class.
11.2 Design the software structure for each of the systems described in Appendix A.
11.3 Can OOD be characterized as a top-down, a bottom-up or some other process?
11.4 If programming and design are really two aspects of the same process (as OOD
suggests), does this mean that all designers must also be programmers?
11.5 To what extent is an OOD influenced by the class library of reusable components
that is available? To what extent must designers be knowledgeable about available
components?
11.6 What features or indicators might you use to help identify potential flaws in an OOD?
For example, what might be the problem with a class that has an excessive number of
methods? What could be done about this class? Again, is there a problem with a class
that only calls other classes and provides no methods that are used by other classes?
What might be done about this situation?
11.7 Design a program that allows two-dimensional shapes to be drawn on the screen. A
square, circle, triangle or rectangle can be selected from a list of options and positioned
at a place on the screen using a mouse. A shape can be repositioned, deleted
or its size changed using the usual mouse operations.
11.8 Suggest features for a software tool that would support the creation, storage and
editing of class diagrams.
11.9 Suggest features for a software tool that would support the creation, storage and
editing of CRC cards. Suggest features for checking the consistency of a collection
of such cards.
11.10 Evaluate OOD under the following headings:
■ special features and strengths.
■ weaknesses
■ philosophy/perspective?
■ systematic?
■ appropriate applications
■ inappropriate applications
■ is the method top-down, bottom-up or something else?
■ good for large-scale design?
■ good for small-scale design?
■ can tools assist in using the method?