collections class sort

package myutil;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
class MycComparator implements Comparator  {
    public int compare(Object o1,Object o2 ) {
        String s1=(String)o1;
        String s2=(String)o2;
        return s2.compareTo(s1);
}
}
public class CollectionsSort {
       public static void main(String [] args )  {
         List l=new ArrayList();
        l.add("Z");
        l.add("A");
        l.add("H");
        l.add("E");
        l.add("O");
        l.add("B");
        l.add("F");
        l.add("Y");
        System.out.println("The List Before Sorting"+l);
        Collections.sort(l);
         System.out.println("The List After Sorting asending order"+l);
         // using comparator
         Collections.sort(l,new MycComparator());
         System.out.println("The List After Sorting dsending order"+l);
        
     }
    }

output:
The List Before Sorting[Z, A, H, E, O, B, F, Y]
The List After Sorting asending order[A, B, E, F, H, O, Y, Z]
The List After Sorting dsending order[Z, Y, O, H, F, E, B, A]