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  1. import java.util.*;
  2.  
  3. class ValueComparator implements Comparator
  4. {
  5.      Map map;
  6.      ValueComparator(Map map) 
  7.      {
  8.          this.map = map;
  9.      }
  10.  
  11.      public int compare(Object a, Object b) 
  12.      {
  13.          if ((double) map.get(a) > (double) map.get(b)) 
  14.              return 1;
  15.          else 
  16.              return -1;
  17.      }
  18. }
  19.  
  20. class Tester
  21. {
  22.      public static void main(String[] args) 
  23.      {
  24.          //make map.
  25.          Map map = new HashMap(); 
  26.          map.put("Beltre", .324);
  27.          map.put("Martinez", .335);
  28.          map.put("Alluve", .341);
  29.          map.put("Brantley", .327);
  30.          System.out.println("Unsorted: " + map);
  31.  
  32.          //put in a TreeMap.
  33.          Comparator comparator = new ValueComparator(map); 
  34.          Map sortedmap = new TreeMap(comparator);
  35.          sortedmap.putAll(map);
  36.          System.out.println("Sorted: " + sortedmap);
  37.      }
  38. }
Success #stdin #stdout 0.08s 380160KB
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Standard input is empty
stdout
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Unsorted: {Brantley=0.327, Martinez=0.335, Alluve=0.341, Beltre=0.324}
Sorted: {Beltre=0.324, Brantley=0.327, Martinez=0.335, Alluve=0.341}
https://ideone.com/mO3vJJ
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
secret

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