Java Vector class

// Demonstrate various Vector operations. 
import java.util.Enumeration;
import java.util.Vector;

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

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

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

    v.addElement(1);/*from  www.  j  ava2s.co  m*/
    v.addElement(2);
    v.addElement(3);
    v.addElement(4);

    System.out.println("Capacity after four additions: " + v.capacity());
    v.addElement(5);
    System.out.println("Current capacity: " + v.capacity());
    v.addElement(6);
    v.addElement(7);

    System.out.println("Current capacity: " + v.capacity());
    v.addElement(9);
    v.addElement(10);

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

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

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

    // Enumerate the elements in the vector.
    Enumeration<Integer> vEnum = v.elements();

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