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Sorting a List of objects by field

Adam Teg
Ranch Hand

Joined: Feb 09, 2006
Posts: 36
I have a list of objects for example Object owner with firstName, lastName etc. Is there a quick way to sort the list by any of the fields example lastName?

Thanks
Ernest Friedman-Hill
author and iconoclast
Marshal

Joined: Jul 08, 2003
Posts: 24187
    
  34

Yes. Write a class that implements java.util.Comparator which compares two of your objects however you like. Then call either java.util.Arrays.sort() (if you have an array) or java.util.Collections.sort() (if you have an actual List) to sort the items, passing an instance of your Comparator class as an argument.


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Arulanand Dayalan
Ranch Hand

Joined: Aug 10, 2005
Posts: 124
You can try using org.apache.commons.beanutils.BeanComparator.

Collections.sort(alList, new BeanComparator(attribute));
Where,

alList is the list which needs to be sorted.
attribute is the bean field on which the list needs to sorted.

Hope this helps.

Thanks and Regards,
Arul.
Joanne Neal
Rancher

Joined: Aug 05, 2005
Posts: 3739
    
  16
You might want to look at this post. It appears to be asking a similar question.


Joanne
 
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subject: Sorting a List of objects by field