Vector in java

What is Vector?

• The vector class extends AbstractList and implements the List interface.

• Like ArrayList, it is a resizable array or growable array of objects

• Duplicates are allowed

• It also maintains insertion order

• Supports heterogeneous objects(different type of objects)

• null insertion allowed (v.add(null))  //where v ---> vector
• Vector implements serializable, cloneable, Iterable, List  and RandomAccess

Constructors::

1) Vector v=new Vector(); # creates an empty vector object with default initial capacity 10.Once vector reaches its max. capacity then a New vector object created with 
//New capacity= currentcapacity * 2 ;  (double of default capacity 10)

2) Vector v=new Vector(int initialcapacity);  # create an empty Vector with specified initial capacity.

ex: Vector v=new Vector(10);    # will create a vector of initial capacity of 10

3) Vector v=new Vector(Collection c);  # create an equivalent Vector object for the given collection.

4) Vector object= new vector(int initialcapacity, capacityIncrement)

ex: Vector v=new Vector(5,9);

##sample demo program ###

import java.util.Enumeration;
import java.util.Vector;

public class VectorDemo {
    public static void main(String[] args) {
    Vector v = new Vector<>();
    System.out.println("default inital capacity ::" + v.capacity());
    v.addElement(10);
    v.addElement(10);
    v.addElement("string type");
    v.addElement(1.2f);
    v.addElement(1);
    v.addElement(null);
    System.out.println("vectorList elements ::" + v);
    System.out.println("vector elements class ::" + v.getClass());
    System.out.println("Retrive element from vector :" + v.get(2));

    // Display vector elements
    Enumeration e = v.elements();
    while (e.hasMoreElements()) {
    System.out.println("displaying vector element " + e.nextElement());
   }
  }
}

output:

Vector program in java

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