//using vectors
import java.util.*;

class VectorTest {

	public static void main (String args[]) {

		Vector v=new Vector();	
		System.out.println ("Vector now has " + v.size() + " elements");
		v.addElement(20);
		v.addElement(30);
		v.addElement(new Pair(10,10));
		System.out.println ("Vector now has " + v.size() + " elements");

		Object p = v.elementAt(2);
		((Pair) p).prn();

		System.out.println (v.elementAt(2));


	}	

}