Vector class

Advantages of Vector over Array:

1. Vectors are convenient to use because it store objects.
2. A Vector can be used to store a list of objects that may vary in size.
3. We can add and delete objects from the vector list as when required.

Methods use in Vector:

1. list.addElement(item): Add the item specified to the list at the end.
2. list.elementAt(10): Gives the name of 10th object.
3. list.size(): Gives the number of objects present.
4. list.removeElement(item): Remove the specified item from the list.
5. list.removeElementAt(n): Remove the item stored in nth position of the list.
6. list.removeAllElements(): Removes all the elements in the list.
7. list.copyInto(array): Copies all items from list to array.
8. list.insertElementAt(item, n): Inserts the item at nth position.

Example 1: WAP to convert a string vector into an array of strings and displays the strings.

import java.util.*;
class languagevector
{
    public static void main(String args[])
    {
        Vector list = new Vector();
        int length = args.length;
        for(int i=0; i<length; i++)
        {
            list.addElement(args[i]);
        }
        list.insertElementAt("COBOL",2);
        int size = list.size();
        String listArray[] = new String[size];
        list.copyInto(listArray);
        System.out.println(“List of Language”);
        for(int i=0; i<size; i++)
        {
            System.out.println(listArray[i]);
        }
    }
}