RE: Java and OO Concepts

["Dan Kimmel" <dkimmel@xxxxxxxxxxxxxxx>]

I'm having trouble understanding what it is you're trying to do. What is
the relationship between Item and InventoryClass? Is it a "has a" or "is
a" relationship. If it is "is a" then you want Item to extend (or
implement) InventoryClass. What classes are you thinking about using for
E when you instantiate InventoryClass? 

-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx
[mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of James Perkins
Sent: Friday, March 06, 2009 1:04 PM
To: Java Programming on and around the iSeries / AS400
Subject: Java and OO Concepts

Hi All,
Just looking for a little advice here. I'm trying to (still) wrap my
head around OO design.

I'm working on an application for order entry. I want to take a list of
items and turn them into an order. Not really a big deal, but just the
high level overview.

I have a class Item that looks something like this, mainly the
properties is where my question is.
public class Item {
    private boolean active;
    private String description;
    private int inventoryClass;
    private String ean;
    private int inventorySubclass;
    private String itemNumber;
    private String keywords;
    private String uom;
    private String upc;
    private double weight;
 ...
}

I'm wondering now, if inventoryClass should now be a new class
InventoryClass same with inventorySubclass and uom. Make it more generic
has I could make it more generic like so:
public final class InventoryClass<E> {
    private final E inventoryClass;

    public InventoryClass(E inventoryClass) {
        this.inventoryClass = inventoryClass;
    }

    public final E getInventoryClass() {
        return inventoryClass;
    }
}

So, my question is this. Am I heading down the right track? Am I
thinking to RPG/procedural programming like?

Any advice is welcome.

Thanks in advance,
--
James R. Perkins

P.S.
If anybody is interested I have created a List factory class that will
return a generic version of a List without having to infer the generics
on the static factory method.
Example:
List<String> list = newArrayList();
If anybody is interested, I'm willing to share. I'm almost done with a
Map one too.
--
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