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GeezerVison is showing www.tutorialspoint.com — Java Vector Class 
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Java Vector ClassIntroductionVector implements a dynamic array. It is similar to ArrayList, but with two differences −
Vector proves to be very useful if you don't know the size of the array in advance or you just need one that can change sizes over the lifetime of a program. The java.util.Vector class implements a growable array of objects. Similar to an Array, it contains components that can be accessed using an integer index. Following are the important points about Vector −
Class declarationFollowing is the declaration for java.util.Vector class − public class Vector<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, Serializable Here <E> represents an Element, which could be any class. For example, if you're building an array list of Integers then you'd initialize it as follows − ArrayList<Integer> list = new ArrayList<Integer>(); Class constructors
Class methods
Methods inheritedThis class inherits methods from the following classes −
Adding Elements and Iterating a Vector ExampleThe following program illustrates several of the methods supported by Vector collection − import java.util.*;
public 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();
}
}
This will produce the following result − OutputInitial 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 
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