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Ordered and Sorted
Joined: Nov 18, 2005
Jun 08, 2006 03:36:00
Can somebody explain howz order is defined? How to find which collection is ordered or unordered/sorted or unsorted?
Joined: Jul 11, 2003
Jun 08, 2006 04:29:00
Ordering & Sorting are 2 distinct names to same concept . Java has the concept of Natural Ordering means objects like Strings are self ordered in
Hence collections that contain
as key or string as objects are by default sorted .
Collections like List,Set ,Map need sorting . There are variants to these also like
,Hashtables need sorting...
If you want your objects to be sorted you have to implement a Comparator interface for that . It has a method compareTo(Object 1 , Object2) that sorts 2 objects while adding them in Collections.
There is also a utility method sort(Collection collection) on Collections class that sorts the collection .
Joined: Sep 14, 1999
Jun 08, 2006 07:59:00
Note that something that is ordered may not be sorted. Ordering means that the order of access is defined, e.g. I get stuff back in the order that I put it in. It may not however be sorted in any way.
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I agree. Here's the link:
subject: Ordered and Sorted
Difference between sorted and ordered?
ordered and sorted
Is both Vector and Hashtable maintains object references in the order they were added?
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