Java by API/java.util/Comparator

implements Comparator < E >

   <source lang="java">

/**

*Output: 
F E D C B A 
 */

import java.util.ruparator; import java.util.TreeSet; class MyComparator implements Comparator<String> {

 public int compare(String a, String b) {
   String aStr, bStr;
   aStr = a;
   bStr = b;
   return bStr.rupareTo(aStr);
 }
 // No need to override equals.

} public class MainClass {

 public static void main(String args[]) {
   TreeSet<String> ts = new TreeSet<String>(new MyComparator());
   ts.add("C");
   ts.add("A");
   ts.add("B");
   ts.add("E");
   ts.add("F");
   ts.add("D");
   for (String element : ts)
     System.out.print(element + " ");
   System.out.println();
 }

}

      </source>