Programming it's a play

[Dennis Leeuw]

Hi all,

I picked up working at the Objective-C programming guide. The last 
couple of weeks I have been working on the Guide and have been reading a 
lot of documentation. The more I read the less happy I was with the 
Wheel example off the current Guide for Classes and Objects.

So I need an new idea. The following is what I came up with to explain 
the OO programing terms. I would like people to review the following 
text to see if that can be used as an explanation of Objective-C 
programming.

Sorry for the docbook layout stuff, but I just cut everything from 
myVersion of the Programming Guide.

Thanks for any input/remarks etc.

<para>If we are a school for actors we have a written definition of what 
an actor is. From the <ulink url="http://dictionary.cambridge.org/";>The 
cambridge dictionary</ulink> a description might be: <cite>someone who 
pretends to be someone else while performing in a film, theatrical 
performance, or television or radio programme</cite>.</para>

<para>With the above we have defined a class. In this case everyone that 
fits within the above description is an actor. The oposite is also true, 
everyone who wants to be an actor has to perform the above 
definition.</para>

<para>As soon as a person takes a course at our school we will educate 
her to be come an actor, which equals to our programming a class. When 
she finishes our lessons she is an actor, this is the compiling. As long 
as the compiling is not successful the lessons aren't finished. When the 
compiling succeeds we have created a class object, namely an actor, able 
to perform any role.</para>

<para>But as the above definition says she will only be a true actor, 
when she performs, she has to perform in e.g a play. Since every play is 
different she has to learn a role (get specific, play related, 
information: instance variables). When she plays the role she has then 
become our object.</para>

<para>The events happening on stage are the messages on which our 
actress acts.</para>

<para>Our actress ofcourse is also female, so her root class is females. 
And she inherits from her female root class all methods that make her 
female.</para>

Greetings,

Dennis Leeuw