Comments on: Using Abstract Classes in the Flash CS3/4 Library

By: Mims H Wright

Mims H Wright — Tue, 01 Feb 2011 20:44:40 +0000

@aphtk, You’re absolutely right. That was just a typo on my part. I have corrected it.

By: aphtk

aphtk — Tue, 01 Feb 2011 17:34:25 +0000

“…but we can consider a class Abstract if it shouldnâ€™t be extended.”

This sentence has to be wrong! By any standard an Abstract Class exists for the sole reason to be extended by a specialized concrete implementation. You cannot initialize an Abstract class…

For e.g. if I have an abstract class Animal
you cannot do –> var a:Animal = new Animal(); // compile time error

Instead you should–>

public class Cat extends Animal {
public override function abstract_method():whatever_returntype {
//implementation
}
}

By: Og2t

Og2t — Thu, 12 Mar 2009 17:48:44 +0000

That’s very cool, thanks for sharing! I was trying to do it before for making my own TextField and TextArea classes which would look differently but share the same code. It didn’t work for me then and now I know what I was doing wrong :)

By: Gabriel Laet

Gabriel Laet — Thu, 12 Mar 2009 13:54:55 +0000

Another great advantage when using abstract classes is that the class will compile with your application – you don’t need to re-compile the SWC every time.