RE: Java: Using Comparable to Establish Natural Order

I looked at the code and it looks right unfortunately I haven't installed
the Java sdk on this new box so I can't compile it.  My suggestion is make a
simple test maybe use your Icomparible code in a  simple list outside of the
larger application and test it to make sure it's doing what you think it's
supposed to.  Then go to the queue..  I am getting started installing the
java sdk on Vista right now hopefully it will go smoothly and then I will be
able to take a look closer.

Make sure you print values all over the place when testing it and you will
more quickly catch the error.

Ken

-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Jared Wright
Sent: Friday, November 28, 2008 7:16 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: Re: Java: Using Comparable to Establish Natural Order

Nope. Had migrated to other bits and pieces of code in the little bit of 
time I had on Thanksgiving. Would still appreciate any thoughts or 
suggestions you might have.

JW

Ken Perry wrote:
> Did you get this working I am just now catching up with mail.
>
> Ken
>
> -----Original Message-----
> From: programmingblind-bounce@xxxxxxxxxxxxx
> [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Jared Wright
> Sent: Thursday, November 27, 2008 12:28 PM
> To: programmingblind@xxxxxxxxxxxxx
> Subject: Java: Using Comparable to Establish Natural Order
>
> Hi all, I've used comparable before, but with this go 'round I have 
> found I must be missing something. I'm trying to use Comparable to 
> establish the natural order of an Item class. Each item has a cost, 
> size, and with these two values, the "value" of the item can be 
> calculated. I wish for this value metric to be the index for the items' 
> natural ordering, so priority queues and collection sorting methods will 
> use this to order item objects. With the below code, my items are all 
> returned to me from a priority queue simply in the reverse order they 
> were added to the queue. Suggestions aappreciated, and I'll give much 
> thanks on this of all days for any help! *grin* I am trying to have it 
> order items with highest values first.
>
> Best,
> JW
>
>
> // Class representing an item.
> class Item implements Comparable {
>     private double cost=0; private double size=0;
>     public Item(double dCost, double dSize) {
>         cost = dCost;
>         size = dSize;
>     }
>     public double getCost() {
>         return cost;
>     }
>     public double getSize() {
>         return size;
>     }
>     public double getValue() {
>         return cost/size;
>     }
>     public int compareTo(Object oItem) {
>         double oItemValue = ((Item)oItem).getValue();
>         double result = ((this.getValue()))-oItemValue;
>         return (int)result;
>     }
>     }
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