From: Zach Dennis <zdennis@...>
Date: 2003-11-12T03:44:40+09:00
Subject: Re: Ruby/Tk Some Basic Questions

I think that is a good question!!

I know an abstract class in Java, and I just figured the same thing applied
here in a ruby-ish way, but I was pondering the exact same question! What is
an abstract class in Ruby?

Zach

-----Original Message-----
From: David D'Andrea [mailto:david.dandrea@sympatico.ca]
Sent: Tuesday, November 11, 2003 1:05 PM
To: ruby-talk ML
Subject: Re: Ruby/Tk Some Basic Questions


If you'll forgive another newbie question:

What is an abstract class?

I think of classes as abstract already, and objects as concrete.  Maybe
an abstract class is one that never gets instantiated, but is always
further specified / subclassed before being used?

David

On Monday, November 10, 2003, at 08:49  PM, Hidetoshi NAGAI wrote:

> Hi,
>
> From: "Zach Dennis" <zdennis@mktec.com>
>> I am wondering if there is a
>> major difference between TkRoot and TkWindow and it might be. In all
>> of the
>> ruby examples folks use TkRoot and assign all widgets to it, but the
>> TkWindow still exists. So why use one over the other?
>
> TkWindow class is an abstract class.
> --
>                                   Hidetoshi NAGAI
> (nagai@ai.kyutech.ac.jp)
>