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  • Subject: Re: OOP for novices
  • From: Chris Rehm <Mr.AS400@xxxxxxx>
  • Date: Tue, 24 Feb 1998 20:12:23 PDT

** Reply to note from Scott Cornell <CORNELLS@MERCYHEALTH.COM> Mon, 23 Feb 1998 
10:11:28 -0500


> Just curious though - based on your posts and some other responses, 
> wouldn't you say that OO developers shake out into 2 groups (or 
> maybe wearing 2 hats might be a better way to put it) - the "Class & 
> Objects" designers and the "Application" designers.  The C&O guys  
> create classes like "Beverage machine", for which they may or may 
> not use OO laguages and/or pre-existing classes - point is, somewhere 
> down at the bottom (or top?) of the class heirarchy there stiill exists 
> simple step-by-step code (dare I say it - procedural code!) to tell the 
> CPU what to do when a given method for an instance of "Beverage 
> Machine" gets fired.  On the other hand, the Apps guys don't (as you 
> say) give a hoot how "Beverage Machines" do what they do - they just 
> care about using "Beverage Machines" and whatever other Lincoln 
> Log/Lego/Tinker Toy pre-built pieces they need to get the cup of 
> tea/coffee/whatever out of their app.  The C&O guy and the Apps guy 
> may be one and the same person - but once I've worn my C&O hat & 
> developed a "Beverage machine" I know works (presuming no-one else 
> has done it for me - hey one can buy OO evironments that come 
> w/hundred's of pre-packaged object classes, right?), I then slip on my 
> Apps hat to blissfully develop my "cup of tea" app w/o worrying about 
> the underlying code.  Whatcha tink? 
>  
> Scott Cornell

You are pretty accurate, Scott. 

How all this is handled is of course up to each different shop, but there
really are three different levels of coders. 

The highest level is the guy who designs the classes and maintains the
relationships between them. This is the person who keeps track of the
relationships between different classes and keeps thing from being
redundant. 

Next would be the guys who sub-class into specific classes (coffee-machine
from beverage machine) and write the methods necessary for using those. 

Then would be the ones who put all the objects together in useable packages
like applications. Here they work with the end user to determine
requirements, and then put together solutions from available classes.

You could blend these guys how you like, some of the app makers also
defining specific classes, or some of the specific guys also designing base
classes.

Rather than go back and redo what I written, I would like to point out that
"guys" is a gender neutral term here, as I do not find gender important in
the programming process.


Chris Rehm
Mr.AS400@ibm.net

How often can you afford to be unexpectedly out of business?
Get an AS/400.
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