• Subject: Re: OO Programming?
  • From: "Larry Loen" <lwloen@xxxxxxxxxx>
  • Date: Sat, 20 Jan 2001 23:26:37 -0600
  • Importance: Normal

Aaron Bartell wrote:

> This question has been bugging me for some time now.  Here it is:
> Java is known as an OO programming language but RPG is considered
> procedural.  The other day I had a Java programmer explain to me that the
> difference is not necessarily how you develop one program using a bunch
> different classes and objects but rather how they are stored in memory
> they are called.  Only one copy of a program is stored in memory in Java
> all programs making a call to that particular program are always
> that same one.

Your friend is incorrect.

It has been possible since the late sixties to have many jobs never mind
programs be able to call program X and have there be only one copy of X in
the entire system.

iSeries, AS/400 and even the System 38 _always_ worked this way, in fact.

There is a whole blizzard of ancient jargon like "reentrant" and "reusable"
and so on that applies to the "how many copies of the program" discussion.

If anything, a JITed Java program goes the other direction, where each JVM
has its own copy of the code for each class it loads.

This distinction your friend was describing has nothing whatever
to do with procedural versus object oriented programming.

Larry W. Loen  -   Senior Java and AS/400 Performance Analyst
                          Dept HP4, Rochester MN

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