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  1.  
  2. import java.util.*;
  3.  
  4. class KeyComparator implements Comparator
  5. {
  6.     public int compare(Object a, Object b) 
  7.     {
  8.         if ((char) a > (char) b)
  9.         	return 1;
  10.         else
  11.         	return -1;
  12.     }
  13. }
  14.  
  15. class Tester
  16. {
  17.      public static void main(String[] args)
  18.      {
  19.            Map map = new HashMap();
  20. 			map.put('B', 3);          
  21. 			map.put('A', 1);
  22. 			map.put('C', 2);
  23.  
  24. 			Map sortedmap = new TreeMap(new KeyComparator());
  25. 			sortedmap.putAll(map);
  26.  
  27.            System.out.print(sortedmap);
  28.      }
  29. }
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/IvgF7M
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
secret

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