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By Alan Shalloway

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The geometry in V2 is therefore stored in objects. When a system requests a model, it gets back an object which represents the model. This model object contains a set of objects, each representing a feature. Since the problem domain is based on features, it is not surprising that the classes V2 uses to represent these features correspond exactly to the ones I have mentioned already: slots, holes, cutouts, specials, and irregulars. Therefore, in V2, I can get a set of objects that correspond to the features that exist in the sheet metal.

The abstract class defines how to solve things conceptually. It also gives the specification for communicating with any object derived from it. Each derivation provides the specific implementation needed. fm Page 22 Friday, June 8, 2001 11:58 AM 22 Part I • An Introduction to Object-Oriented Software Development Object-Oriented Programming in Action New example Let’s re-examine the shapes example discussed at the beginning of the chapter. How would I implement it in an object-oriented manner? Remember that it has to do the following: 1.

The internals of objects are unknown to other objects. If I use encapsulation and follow the strategy that objects are responsible for themselves, then the only way to affect an object will be to call a method on that object. The object’s data and the way it implements its responsibilities are shielded from changes caused by other objects. Encapsulation saves us. • The more I make my objects responsible for their own behaviors, the less the controlling programs have to be responsible for. • Encapsulation makes changes to an object’s internal behavior transparent to other objects.

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