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You don’t have to go through the indirection of declaring a pointer and assigning values to it as shown in the example above. You also don’t have to assign each alternative procedure a different name. Messages invoke methods indirectly. ” To find that method, the messaging machinery must check the class of the receiver and locate its implementation of the method named in the message. When this is done at run time, the method is dynamically bound to the message. When it’s done by the compiler, the method is statically bound.
For example, if you are writing a drawing program that allows a user to create images composed of lines, circles, rectangles, text, bit-mapped images, and so forth, you might create classes for many of the basic shapes that a user will be able to manipulate. A Rectangle object, for instance, might have instance variables that identify the position of the rectangle within the drawing along with its width and its height. Other instance variables could define the rectangle’s color, whether or not it is to be filled, and a line pattern that should be used to display the rectangle.
Typically, every class has just one superclass and can have an unlimited number of subclasses. However, in some object-oriented programming languages (though not in Objective-C), a class can have more than one superclass; it can inherit through multiple sources. Instead of a single hierarchy that branches downward as shown in Figure 2-4 (page 32), multiple inheritance lets some branches of the hierarchy (or of different hierarchies) merge. 32 The Object Model C H A P T E R 2 Object-Oriented Programming Subclass Definitions A subclass can make three kinds of changes to the definition it inherits through its superclass: ■ It can expand the class definition it inherits by adding new methods and instance variables.