Download PDF by William B Sanders; Chandima Cumaranatunge: ActionScript 3.0 design patterns

By William B Sanders; Chandima Cumaranatunge

ISBN-10: 0596528469

ISBN-13: 9780596528461

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Example text

Rather than relying on inheritance (which is discussed in the next section), the great majority of design patterns rely on composition. Later in this chapter, in the section, “Favor Composition,” you will see how design patterns are made up of several different objects. For the design patterns to work the way they are intended, object encapsulation is essential. Inheritance The third key concept in good OOP is inheritance. Inheritance refers to the way one class inherits the properties, methods, and events of another class.

The getter method’s job is to provide data for the implementation. Thus, while the original example doesn’t have a setter method, it does have a getter. The setter makes sure that the client gets only what it’s supposed to get. In Example 1-9, the private variable, dogTalk, is not assigned a default value. However, the variable is still used in both the setter and getter methods. As you will see when you test the new class, EncapSet, the implementation has access to the private variable through the setter’s interface.

Inheritance | 31 Example 1-22. as package { //Subclass of Abstract class public class Subclass extends AbstractClass { override function abstractMethod( ):void { trace("This is the overidden abstract method"); } } } When the application finally implements the methods originating in the abstract class, it does so by programming to the interface (AbstractClass) but instantiates through the subclass (Subclass). So the instance, doDemo, is typed as AbstractClass but instantiated as Subclass. Example 1-23.

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ActionScript 3.0 design patterns by William B Sanders; Chandima Cumaranatunge

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