Well, I'm no wizard in java programming, but couldn't you just:
cityTotal -= o1.getAmount();
grandTotal -= o1.getAmount();
This should work if double takes negatives.
Cheers,
Bard
----- Original Message -----
From: "Jason Meredith" <[EMAIL PROTECTED]>
Date: Tue, 29 Jul 2003 09:15:03 +0100
To: [EMAIL PROTECTED]
Subject: [displaytag-user] Callback Example
> Could somebody show me how to SUBTRACT the amounts, instead of adding them?
>
> <!--StartFragment-->
> package org.apache.taglibs.display.test;
>
> import org.apache.taglibs.display.TableDecorator;
>
> /**
> * This decorator only does a summing of different groups in the reporting
> * style examples...
> **/
>
> public class TotalWrapper extends TableDecorator
> {
> private double cityTotal = 0;
> private double grandTotal = 0;
>
> /**
> * After every row completes we evaluate to see if we should be drawing
> a
> * new total line and summing the results from the previous group.
> */
>
> public String finishRow()
> {
> int listindex = this.getList().indexOf( this.getObject() );
> ReportableListObject o1 = (ReportableListObject)this.getObject();
> String nextCity = "";
>
> cityTotal += o1.getAmount();
> grandTotal += o1.getAmount();
>
> if( listindex == this.getList().size() - 1 ) {
> nextCity = "XXXXXX"; // Last row hack, it's only a demo folks...
> } else {
> nextCity = ( (ReportableListObject)this.getList().get( listindex +
> 1 ) ).getCity();
> }
>
> StringBuffer sb = new StringBuffer( 1000 );
>
> // City subtotals...
> if( !nextCity.equals( o1.getCity() ) ) {
> sb.append( "<tr><td>�</td><td>�</td><td><hr noshade size
> =\"1\"></td>" );
> sb.append( "<td>�</td></tr>" );
>
> sb.append( "<tr><td>�</td>" );
> sb.append( "<td align=\"right\"><b>" + o1.getCity() + "
> Total:</b></td><td><b>" );
> sb.append( cityTotal );
> sb.append( "</b></td><td>�</td></tr>" );
> sb.append( "<tr><td colspan=\"4\">�</td></tr>" );
>
> cityTotal = 0;
> }
>
> // Grand totals...
> if( listindex == this.getList().size() - 1 ) {
> sb.append( "<tr><td colspan=\"4\"><hr noshade size
> =\"1\"></td></tr>" );
> sb.append( "<tr><td>�</td>" );
> sb.append( "<td align=\"right\"><b>Grand Total:</b></td><td><b>"
> );
> sb.append( grandTotal );
> sb.append( "</b></td><td>�</td></tr>" );
> }
>
> return sb.toString();
> }
> }
> <!--EndFragment-->
>
>
>
> Regards
> Jason Meredith
>
> _________________________________________________________________
> Express yourself with cool emoticons - download MSN Messenger today!
> http://www.msn.co.uk/messenger
>
>
>
> -------------------------------------------------------
> This SF.Net email sponsored by: Free pre-built ASP.NET sites including
> Data Reports, E-commerce, Portals, and Forums are available now.
> Download today and enter to win an XBOX or Visual Studio .NET.
> http://aspnet.click-url.com/go/psa00100003ave/direct;at.aspnet_072303_01/01
> _______________________________________________
> displaytag-user mailing list
> [EMAIL PROTECTED]
> https://lists.sourceforge.net/lists/listinfo/displaytag-user
-------------------------------------------------------
This SF.Net email sponsored by: Free pre-built ASP.NET sites including
Data Reports, E-commerce, Portals, and Forums are available now.
Download today and enter to win an XBOX or Visual Studio .NET.
http://aspnet.click-url.com/go/psa00100003ave/direct;at.aspnet_072303_01/01
_______________________________________________
displaytag-user mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/displaytag-user
