RE: Java: Using Comparable to Establish Natural Order
- From: "Ken Perry" <whistler@xxxxxxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Fri, 28 Nov 2008 21:22:03 -0500
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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