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  1. import java.util.*;
  2.  
  3. class KeyComparator implements Comparator
  4. {
  5.     public int compare(Object a, Object b) 
  6.     {
  7.         if ((char) a > (char) b)
  8.         	return 1;
  9.         else
  10.         	return -1;
  11.     }
  12. }
  13.  
  14. class Tester
  15. {
  16. 	public static void main(String[] args)
  17. 	{
  18. 		//make map.
  19. 		Map map = new HashMap(); 
  20. 		map.put('B', 3);          
  21. 		map.put('A', 1);
  22. 		map.put('C', 2);
  23.  
  24. 		//get keylist and sort it.
  25. 		List keylist = new ArrayList(map.keySet());
  26. 		Collections.sort(keylist, new KeyComparator());
  27.  
  28. 		//extract associations and put in a new map.
  29. 		Map sortedmap = new HashMap();
  30. 		for (Object key: keylist)
  31. 			sortedmap.put(key, map.get(key));
  32.  
  33. 		System.out.print(sortedmap);
  34. 	}
  35. }
Success #stdin #stdout 0.08s 380160KB
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Standard input is empty
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{A=1, B=3, C=2}
https://ideone.com/4QOQqF
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
secret

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