Regarding sorting of TreeMap

[yekkala krishna]

Hi,

In my application elements are added to a TreeMap.so whenever we are retrieving elements are displaying in the sorted order of keys.But i want to retrieve the elements in the order in which they are inserted.May i know which will be the correct choice now to do this order?

import java.util.*;
public class TreeMapex {
	/**
	 * @param args
	 */
	public static void main(String[] args) {
    TreeMap tm=new TreeMap();
    tm.put("one", "ALLActiveCSAM1");
    tm.put("two", "ALLActiveT3CSAM");
    tm.put("three", "ALLActiveT1CSAM");
    System.out.println(tm);

	}

}

Thanks in advance.

regards,
rama krishna.y

[Christophe Verré]

Use a LinkedHashMap.

[yekkala krishna]

Hi Verre,

Thanks for your reply.
Elements are displaying in the inserted order if i use LinkedHashMap.
Can i do the same thing using TreeMap?



regards,
Rama Krishna

[amit punekar]

Hi,

But i want to retrieve the elements in the order in which they are inserted

You need to use LinkedHashMap to do this. If you use TreeMap then you are going to get the results in sorted manner based on the Key.

Regards,
Amit

[Campbell Ritchie]

A collections class will display its elements in one order (or no particular order). They are not designed to display two different orders. If you want sorted order as well as insertion order, try your tree Map and a separate List, and add the same element to both. Or insert all your elements into the List and later pass both the key and value for every pair to the Map.