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By Next Computer Inc

ISBN-10: 0201632519

ISBN-13: 9780201632514

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Extra resources for Nextstep Object-Oriented Programming and the Objective C Language: Release 3 (Next Developer's Library)

Sample text

The design is therefore not bound from the outset by data choices. You can decide on the behavior first, and implement the data afterwards. Your choice of data structures can change over time without affecting the design. Designing an object-oriented program doesn’t necessarily entail writing great amounts of code. The reusability of class definitions means that the opportunity is great for building a program largely out of classes devised by others. It might even be possible to construct interesting programs entirely out of classes someone else defined.

It’s strongly recommended that you use the NSObject class provided with OpenStep as the root class. This manual doesn’t explain all the ins and outs that you would need to know to replace it. Inheriting Instance Variables When a class object creates a new instance, the new object contains not only the instance variables that were defined for its class, but also the instance variables defined for its superclass, and for its superclass’s superclass, all the way back to the root class. Thus, the isa instance variable defined in the NSObject class becomes part of every object.

53 Chapter 2 The Objective-C Language Class NSPoint NSColor Pattern ... float float BOOL NSColor ... isa; origin; *primaryColor; linePattern; width; height; filled; *fillColor; declared in NSObject declared in Graphic declared in Shape declared in Rectangle A class doesn’t have to declare instance variables. It can simply define new methods and rely on the instance variables it inherits, if it needs any instance variables at all. For instance, Square might not declare any new instance variables of its own.

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Nextstep Object-Oriented Programming and the Objective C Language: Release 3 (Next Developer's Library) by Next Computer Inc

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