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    Vector  :

                It is one of the predefined 1 – D Legacy Collection frame concrete class present in  
           java.util.* package. The default capacity of vector class ten cells. On the default size of 
          vector class object is zero. No one should not think the capacity ten of Vector is not fixed 
          and it is can be expandable during incoming flow of data in the Vector class object.

                The functionality of vector class object is more or less similar to ArrayList class. But 
         vector object class belongs to synchronized and ArrayList class object belongs to non – 
         synchronized.

         Vector class object always organizes the data in the form of cells. Internally all the values 
         of vectors are processed based on Zero – based indexing concept.

         Profile of Vector Class :

         Constructors :

              1)      Vector()

              2)      Vector(int)

      Instance Methods :

       
             3)      Public void addElement(Object)

             4)      Public void addElement(int,Object)

             5)      Public void removeElement(Object)

             6)      Public void removeElementAt(int)

             7)      Pubic Object getElement(int)

             8)      Public int capacity()

             9)      Public int size()

            10)   Public Enumeration elements()

From the above profile i.e constructors and instance methods.

In constructors first constructor is used for creating the object of vector class, and second constructor is used for creating object and by specifying number of cells or size.

All the instance methods from 3 to 6 is used for adding and removing elements.

One important methods among all methods is elements.

      Public Enumeration elements() :

                      This method is used for retrieving or extracting all the elements of any legacy  
            collection frame work and forms like a chain and this method returns any object of 
            Enumeration and it is by default pointing just before the first element.

      ArrayList  Vs Vector class :

           The functionality of vector class object is more or less similar to ArrayList class. But vector object  class belongs to synchronized and ArrayList class object belongs to non – synchronized.

   

      The Following Example Illustrate the Concept of Vector Class : 

   

      import java.util.*;

     Class vect

    {

       Public static void main(String Args[])

      {

        Vector v=new Vector();

        System.out.println(“Content of v”+v);

        System.out.println(“Size of v “+v.size());//0

        System.out.println(“Capacity of v “+v.capacity());//10

         //add the data to vector.

         v.add(new Integer(10));

         v.add(new Float(20.3f));

         v.add(new Character(‘a’));

         v.add(new String(“JavaJavax”));

        System.out.println(“Content of v”+v);//10, 20.3, a, JavaJavax

        System.out.println(“Size of v “+v.size());//4

        System.out.println(“Capacity of v “+v.capacity());//10

        System.out.println(“Extract the data from vector”);

         Enumeration e=v.elements();

        While(e.hasMoreElements())

         {

         Object obj=e.nextElement();

         System.out.println(obj);

          }

        }

     }

    } 

 
     Data Extraction Interfaces are as follows :

•       Iterator (I)
•       ListIterator(I)
•       Enumeration (I).

          1- D and 2-D Collection Frame work classes are 

     

•         LinkedList 
•         ArrayList
•         HashSet
•         TreeSet
•         HashMap
•         TreeMap
•         Stack
•         HashTable
•         Dictionary 
•         Properties

        To read the values dynamically from keyboard their is a class.

                 Java.util.Scanner or Scanner class