Demonstrate various Vector operations

Here is a Java Program to Demonstrate various Vector operations.

import java.util.*;

class VectorDemo {
  public static void main(String args[]) {

    // initial size is 3, increment is 2
    Vector v = new Vector(3, 2);

    System.out.println("Initial size: " + v.size());
    System.out.println("Initial capacity: " +
                       v.capacity());

    v.addElement(new Integer(1));
    v.addElement(new Integer(2));
    v.addElement(new Integer(3));
    v.addElement(new Integer(4));

    System.out.println("Capacity after four additions: " +
                       v.capacity());
    v.addElement(new Double(5.45));
    System.out.println("Current capacity: " +
                       v.capacity());
    v.addElement(new Double(6.08));
    v.addElement(new Integer(7));

    System.out.println("Current capacity: " +
                       v.capacity());
    v.addElement(new Float(9.4));
    v.addElement(new Integer(10));

    System.out.println("Current capacity: " +
                       v.capacity());
    v.addElement(new Integer(11));
    v.addElement(new Integer(12));


    System.out.println("First element: " +
                       (Integer)v.firstElement());
    System.out.println("Last element: " +
                       (Integer)v.lastElement());

    if(v.contains(new Integer(3)))
      System.out.println("Vector contains 3.");

    // enumerate the elements in the vector.
    Enumeration vEnum = v.elements();

    System.out.println("\nElements in vector:");
    while(vEnum.hasMoreElements())
      System.out.print(vEnum.nextElement() + " ");
    System.out.println();
  }
}

Output of Above Java Program
Initial size: 0
Initial capacity: 3
Capacity after four additions: 5
Current capacity: 5
Current capacity: 7
Current capacity: 9
First element: 1
Last element: 12
Vector contains 3.

Elements in vector:
1 2 3 4 5.45 6.08 7 9.4 10 11 12