Vector Binary in java pgm

Vector Binary

import java.util.Collections;

import java.util.Vector;

public class Main

{

public static void main(String[] args)

{

      Vector v = new Vector();

      v.add("X");

      v.add("M");

      v.add("D");

      v.add("A");

      v.add("O");

      Collections.sort(v);

      System.out.println(v);

      int index = Collections.binarySearch(v, "D");

      System.out.println("Element found at : " + index);

   }

}