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Several years ago I wrote an article on using abstract classses and interfaces in Java . Back than I was absolutely sure that writing object-oriented code is a must. These days, I'm using yet another language called ActionScript 3 (AS3), which supports all OOP paraphenalia plus has provisions for dynamic data types. This article illustrates my up to date vision of OOP with and without interfaces. OK, let's go.

You know the drill: a language is called object-oriented if it supports inheritance, encapsulation and polymorphism. The first two notions can be easily defined:

- Inheritance allows you to design a class by deriving it from an existing one. This feature allows you to reuse existing code without doing copy and paste. AS3 provides the keyword extends for declaring class inheritance, for example:

package com.theriabook.oop{
public class Person {
var name:String;
}
}

package com.theriabook.oop{
public class Consultant extends Person{
var dailyRate:Number;
}
}

package com.theriabook.oop{
public class Employee extends Person{
var salary:Number;
}
}



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this is just a small excerpt from the article, to access the full article please click in the link below:

http://flexblog.faratasystems.com/?p=153




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