How to count redundant values of HashMap entrysets?

Tue, 13 Jul 2010 17:39:25 -0400

How can I count this hashmap? I would like to display:
1. All champions who won more than once - show the number that they won. eg. Uraguay: 2
2. I would like to display the country who won most World Cup: say Brazil: 5

The above...

And Another Thing

Thu, 16 Mar 2006 09:38:05 -0500

Not sure that it's good practise to consider a Map as having an ordering at all.

Possible Enhancement

Thu, 16 Mar 2006 09:36:39 -0500

Along the same lines as Oluwafemi's. Using an annonymous inner class is a little cleaner perhaps.

----------------------------

Map map = new HashMap

Correction

Thu, 15 Dec 2005 12:12:20 -0500

In my previous post there were 2 errors - CombinationEntry should be CustomEntry. Here is the corrected version of my message:
--------

I had the same problem - could not sort a map based on values rather than keys. To solve this I simply...

Solution - Use a List

Wed, 14 Dec 2005 18:42:17 -0500

I had the same problem - could not sort a map based on values rather than keys. To solve this I simply created a list of objects, where each object wraps a Map.Entry and implements java.lang.Comparable.

Here's the class:
-----
import...

Use TreeMap

Fri, 14 Oct 2005 10:58:50 -0400

I would look at the TreeMap that is available in 1.3 and look at implementing the comparable interfaces to the value objects or provide a comparator object. This should take care of all your probs.

How about without LinkedHashMap

Mon, 03 Oct 2005 14:01:19 -0400

Any ideas on how to do this without using a LinkedHashMap? We're still on 1.3 which doesn't support LinkedHashMap and I'm not going to get the web admins to upgrade us anytime soon.

Close, but throws out ties

Thu, 31 Mar 2005 10:23:36 -0500

That works if all the values are unique, which isn't true in my case. I ened up with the below. Maybe somebody can make it better, but it does deal with duplicate values.

public LinkedHashMap sortHashMapByValues(HashMap passedMap,...

Re: Sorting Maps based on its values

Mon, 25 Oct 2004 06:03:14 -0400

Thank You, Artem & Anders, That was of great help.

Regards,
Vishal

Re: Sorting Maps based on its values

Sun, 24 Oct 2004 18:27:07 -0400

If it doesn't have to be a 'Hash' map and if you're allowed to leverage some nice open source you may want to consider automaticly sorted maps like the TreeBidiMap (a SortedBidiMap) of Jakarta Commons Collections. Direct link to Javadoc

Sorting HashMap based on its Values

Thu, 21 Oct 2004 12:22:28 -0400

Something like this, maybe?

Map someMap= new LinkedHashMap();

someMap.put("key1","c");
someMap.put("key2","a");
someMap.put("key3","b");

List mapKeys = new...

Sorting HashMap based on its Values

Thu, 21 Oct 2004 05:01:53 -0400

Hi,

Can someone suggest me or send a code snippet to sort the HashMap based on its values(not the keys), so that when I display, I get the values in some sorted manner.

Thanks & Regards,
Vishal

Support Forums: Message List - Sorting HashMap based on its Values

How to count redundant values of HashMap entrysets?

And Another Thing

Possible Enhancement

Correction

Solution - Use a List

Use TreeMap

How about without LinkedHashMap

Close, but throws out ties

Re: Sorting Maps based on its values

Re: Sorting Maps based on its values

Sorting HashMap based on its Values

Sorting HashMap based on its Values