ActionScript 3.0 design patterns, Edition: 1st ed by William B Sanders; Chandima Cumaranatunge

By William B Sanders; Chandima Cumaranatunge

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Additional resources for ActionScript 3.0 design patterns, Edition: 1st ed

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So when referring to an implementation, the reference is to the actual program as it is coded. Implementation is the internal details of a program, but is often used to refer to a method or class itself. You may run into some confusion when the keyword implements refers to contracting with an interface structure. For example, the line: class MyClass implements IMyInterface has the effect of passing the interface of IMyInterface to MyClass. To say that MyClass implements IMyInterface really means that MyClass promises to use all the signatures of IMyInterface and add the coding details to them.

Mp3"); } } } Note that both instances, guitar and bongo, are typed to the supertype, BandFace, and not to either the Guitar or the Bongo classes. This practice follows the first principle of reusable object-oriented design: Program to an interface, not an implementation. The purpose of doing so is to maintain flexibility and reusability. This principle will be fully explored elsewhere in this chapter and in Chapter 8, but for now, just note that fact. A word about the interface and abstract class naming conventions used in this book: with the focal point of this book on object-oriented programming and design patterns, we use naming conventions that best reflect and clarify the structure of the different design patterns.

Example 1-14. as package { public class Dog extends QuadPets { public function Dog( ):void { } public function bark( ):void { trace("Dog class: Bow wow"); } } } Example 1-15. as package { public class Cat extends QuadPets { public function Cat( ):void { } public function meow( ):void { trace("Cat class: Meow"); } } } To see how the Dog and Cat classes inherit the operations of the superclass, the TestPets class simply invokes the single method (makeSound) from the superclass. As you can see from the Dog and Cat classes, no such method can be seen in their construction, and so you can see that it must have originated in the QuadPets class.

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