commons-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Jean-François <jean-franc...@formatech.be>
Subject Re: Sorting string array numerically
Date Fri, 30 Apr 2004 11:26:53 GMT
Hello,

You have to write a Comparator which parses the string, extracts the number,
and the compares the numbers

Here is a litle example which should normally work :

public class StringNumberComparator
    implements java.util.Comparator {
  /**
   * compare les 2 objects
   */
  public int compare(Object obj1, Object obj2)
    throws ClassCastException {
        String str1 = ((String) obj1).substring(4);
        String str2 = ((String)obj2).substring(4);
        int nb1 = Integer.parseInt(str1);
        int nb2 = Integer.parseInt(str2);

        if ( nb1 == nb2 ) {
            return 0;
        } else if ( nb1 > nb2 ) {
            return 1;
        } else {
            return -1:
        }

    }
}


Henrard Jean-François

FORMATECH NEW TECHNOLOGIES
Avenue G. Poelslaan 8-10
BRUXELLES 1160 BRUSSEL

Tel.     +32 2 675 08 41
Fax.    +32 2 675 08 43
Web Site : http://www.formatech.be

Email  jean-francois@formatech.be


----- Original Message ----- 
From: "Søren Blidorf" <soren@nolas.dk>
To: <commons-user@jakarta.apache.org>
Sent: Friday, April 30, 2004 11:06 AM
Subject: Sorting string array numerically


> Hi
>
> I have a problem regarding sorting numerically.
>
> I have the following pics:
>
> pic_1, pic_2, pic_3, pic_4, pic_5, pic_6, pic_7, pic_8,
> pic_9, pic_10, pic_11, pic_12
>
> But the sort makes a sort after first number then second
> number:
>
> pic_1, pic_10, pic_11, pic_12, pic_2, pic_3, pic_4, pic_5,
> pic_6, pic_7, pic_8, pic_9
>
> How can I make sure that the sort is numeric?
>
> pic_1, pic_2, pic_3, pic_4, pic_5, pic_6, pic_7, pic_8,
> pic_9, pic_10, pic_11, pic_12
>
> BR
>
> Soren
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
>


---------------------------------------------------------------------
To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: commons-user-help@jakarta.apache.org


Mime
View raw message