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How to convert hashmap to treeset ?

Posted on 2013-05-31
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Last Modified: 2013-06-05
Hello,

How to convert hashmap to tree in below code. I need to use treeset instead of set.
Treeset maintain natual ordeing , so that i would like to change it to treeset.

public static void main(String[] args) {
                      MultiHashMap mp=new MultiHashMap();
                      StringBuilder b = new StringBuilder();
                      mp.put("a", 10);
                      mp.put("a", 11);
                      mp.put("a", 12);
                      mp.put("b", 13);
                      mp.put("c", 14);
                      mp.put("e", 15);
                      mp.put("b", 1);
                      mp.put("b", 2);
                      mp.put("b", 3);
                      List list = null;


                      
                     Set set = mp.entrySet();              
                     Iterator i = set.iterator();
                      while(i.hasNext()) {
                          Map.Entry me = (Map.Entry)i.next();
                          list=(List)mp.get(me.getKey()); // get the GROUP here

                          // print out the SAME GROUP a bunch of different times
                          int itemCount = list.size();
                          for (int z = 0; z < itemCount; z++) {
                              // and then print out the the values ..
                              String values = "";
                              for(int j=0;j<list.size();j++)
                              {
                                  values += list.get(j);
                              }
                              System.out.println(me.getKey() + ": value :" + values);
                           }
                       }
                      
                   }
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Question by:Rose_Taylor
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5 Comments
 
LVL 27

Accepted Solution

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dpearson earned 500 total points
ID: 39212383
Rather than a MultiHashMap I think you may want to try using Guava's TreeMultiMap:
http://guava-libraries.googlecode.com/svn/tags/release09/javadoc/com/google/common/collect/TreeMultimap.html

If you're not familiar with Guava it's a set of libraries from Google that's become very popular in the Java world: https://code.google.com/p/guava-libraries/

Doug
0
 

Author Comment

by:Rose_Taylor
ID: 39221032
I've requested that this question be deleted for the following reason:

I didn't get any answer for my question.I did it myself.
In goole collections , Treemultihaspmap i have implemented.Its working good.
Thanks for support.
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LVL 27

Expert Comment

by:dpearson
ID: 39221033
Um isn't that exactly what I suggested using - Google's TreeMultiMap?  It sounds like you followed my advice and it worked perfectly.

I'm not sure why you didn't see that as an answer to your question?

Doug
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Author Closing Comment

by:Rose_Taylor
ID: 39222875
good
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