Exercise 5.4
A library supports the following categories of lending materials, each with its own check-out and check-in policy. Organize these into an inheritance hierarchy:
book audio book record children's puppet video Sega video game rental book Sony Playstation video game CD-ROM book Nintendo video game
An inheritance hierarchy moves from the most abstract to the most specific. In this example, we are given concrete instances of materials loaned by a library. Our task is twofold. First, we must group common abstractions: the four book abstractions and the three video game abstractions. Second, we must provide additional classes that can serve as an abstract interface for the concrete instances. This must be done at two levels: at the level ...
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