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.

Coming up with precisely which rules are necessary to properly classify an object within an abstraction hierarchy is not always easy. Take, for example, the rules we might define for what constitutes a bird: namely, something which:

• Has feathers
• Has wings
• Lays eggs
• Is capable of flying

• Has feathers
• Has wings
• Lays eggs

This rule set is still unnecessarily complicated, because as it turns out, the 'lays eggs' rule is redundant: whether we keep it or eliminate it, it doesn't change our decision of what constitutes a bird versus a non- bird. Therefore, we simplify the rule set once again:

• Has feathers
• Has wings

• Has wings

The process of rule definition for purposes of categorization involves 'dialing in' just the right set of rules — not too general, not too restrictive, and containing no redundancies — to define the correct membership in a particular class.

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