java.util.Vector.add() Method

Description

This add(int index,E element) method is used to Insert the specified element (E) at the specified position (index) in the list. While inserting the new element, it Shifts the existing element currently at that position (if any) and any subsequent elements to the right with changed indices.This is another variation of the previous add () method.

Declaration

Following is the declaration for java.util.Vector.add() method

public void add(int index,E element)

Parameters

• index − This is the index (position) at which the specified element is to be inserted.

• element − This is the element to be inserted at the specified location.

Return Value

The return type is void so the method does not return any value.

Exception

• IndexOutOfBoundsException The method throws this exception if the index (element position) we are trying to access is out of range (index < 0 || index > size()).

Example

The following example shows the usage of java.util.Vector.add(int index,E element) method.

package com.tutorialspoint;

import java.util.Vector;

public class VectorDemo {
   public static void main(String[] args) {

      // create an empty Vector vec with an initial capacity of 4      
      Vector<Integer> vec = new Vector<Integer>(4);

      // use add() method to add elements in the vector
      vec.add(0,4);
      vec.add(1,3);
      vec.add(2,2);
      vec.add(3,1);

      // let us print all the elements available in vector
      System.out.println("Added numbers are :- "); 
      
      for (Integer number : vec) {         
         System.out.println("Index :"+vec.indexOf(number) +" Number: " + number);
      }

      // added new number 10 at 3rd position/index
      vec.add(3,10);

      // let us print all the elements available in vector after insertion
      System.out.println("Added numbers after insertion are :- "); 

      for (Integer number : vec) {         
         System.out.println("Index :"+vec.indexOf(number) +" Number: " + number);
      }
   }  
}

Let us compile and run the above program, this will produce the following result −

Added numbers are :- 
Index :0 Number: 4
Index :1 Number: 3
Index :2 Number: 2
Index :3 Number: 1
Added numbers after insertion are :- 
Index :0 Number: 4
Index :1 Number: 3
Index :2 Number: 2
Index :3 Number: 10
Index :4 Number: 1

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