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Sort a Hashtable

Posted on 2003-12-03
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Last Modified: 2010-04-01
Hello all,

I have a Hashtable with as a key a String and as a value a String.
Now I want to sort this HashTable by the value while still be able to retreive the
key.

Can anybody help me with this?

Thanks in advance,

bvdm23
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Question by:bvdm23
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8 Comments
 
LVL 35

Accepted Solution

by:
TimYates earned 300 total points
ID: 9865500
You can't sort hashtables, as they have no inherrant order

This page explains how to extract your hashtable to an arraylist or vector, then sort that :-)

http://www.airporttools.com/other/programming/hashsorting/
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LVL 35

Expert Comment

by:TimYates
ID: 9865506
>  as they have no inherrant order

By this I mean that you can think of Hashtables, Sets, etc as being like a bag of sweets...  To sort them (in order of colour or size), you will have to put them in a struture that can hold order (like a queue, or list) :-)

Hope that makes more sense :-)

Tim
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LVL 19

Assisted Solution

by:Kuldeepchaturvedi
Kuldeepchaturvedi earned 300 total points
ID: 9865541
Well, I don't see any reason to sort the hashtable.. but here is what you can do..


ArrayList al=Java.util.Collections.list( ht.elements());
al=Java.util.Collections.sort(al);
 This should give you sorted values inside this arraylist..
Obviously your Hashmap will not get sorted inside ( and it should not be anyways... because hashmap decides how he wants to stores the values for effiecient fetch)..
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LVL 19

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by:Kuldeepchaturvedi
ID: 9865548
Why I take so much time in typing?????????
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LVL 35

Expert Comment

by:TimYates
ID: 9865551
Hehehehe :-)
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Expert Comment

by:objects
ID: 9872591
Try a TreeMap with a custom Comparator that compares the mapped values.
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