* The {@code Vector} class implements a growable array of
* objects. Like an array, it contains components that can be
* accessed using an integer index. However, the size of a
* {@code Vector} can grow or shrink as needed to accommodate
* adding and removing items after the {@code Vector} has been created.

public class Vector<E>

    extends AbstractList<E>

    implements List<E>, RandomAccess, Cloneable, java.io.Serializable

{

http://www.cnblogs.com/wanlipeng/archive/2010/10/21/1857791.html