Reviews : Java Books :
Beginning Java Objects : Chapters 2 and 3

Buy this book Title: Beginning Java Objects ISBN: 1861004176 US Price: $ 39.99 Canadian Price: C$ 59.95 UK Price: £ 28.99 Publication Date: November 2000 Pages: 800 © Wrox Press Limited, US and UK.

Abstraction as the Basis for Software Development

• Those that are explicitly offered to us as we interview the intended users of the system.
• Those that we otherwise observe.

As with all abstractions, all of our decisions of inclusion versus elimination when building a software system must be made within the context of the overall purpose and domain, or subject matter focus, of the future system. When representing a person in a software system, for example, is their eye color important? How about their genetic profile? Salary? Hobbies? The answer is, any of these features of a person may be relevant or irrelevant, depending on whether the system to be developed is a:

• Payroll system
• Marketing demographics system
• Optometrist's patient database
• FBI 'most wanted criminals' tracking system
• Public library

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