To quote the first line of the web page you reference: "In more precise
terms, polymorphism (object-oriented programming theory) is the ability
of objects belonging to different types to respond to method calls of
methods of the same name, each one according to an appropriate
type-specific behaviour."
Even though sub-classing is one way to achieve similar interfaces, it's
also common to use interfaces depending on your needs.
interface Bar {
function toString() {}
}
class Foo implements Bar {
function toString() { trace("I'm Foo"); }
}
class Goo implements Bar {
function toString() { trace("I'm Goo"); }
}
var objs:Array = new Array(3);
objs[0] = new Foo();
objs[1] = new Goo();
objs[2] = 12345;
// The following is an example polymorphism. You are
// calling the same method on multiple objects regardles
// of their type because they all have a method with the
// name toString() but perform type-specific behaviour
trace( objs[0].toString() );
trace( objs[1].toString() );
trace( objs[2].toString() );
James O'Reilly - JOR
www.jamesor.com
Jeroen Beckers wrote:
You can't 'choose' the definition of polymorphism :p.
"In simple terms, *polymorphism* lets you treat derived class members
just like their parent class's members."
Source:
http://en.wikipedia.org/wiki/Polymorphism_in_object-oriented_programming
(+ all my java & AS books)
class Foo extends Bar
{
}
var myFoo:Bar = new Foo(); //this is polymorphism !
Giles Taylor wrote:
http://en.wikipedia.org/wiki/Polymorphism_(computer_science)
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Meinte
van't Kruis
Sent: 25 August 2006 14:14
To: Flashcoders mailing list
Subject: Re: [Flashcoders] OOP methodology and flash. I'm loosing my
faith...
well, I get Interfaces, but thanks for explaining :).
I just don't think actionscript, or java, has any polymorphism, since
the definition of that is, in my opinion, a class having more than one
parent class (ie, can extend 2 or more classes), which isn't the case.
So I don't understand why people who are explaining oop in actionscript
talk about polymorphism, because it just isn't there :), but perhaps I'm
wrong.
cheers,
-Meinte
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