Java Program to Add Element at Particular Index of ArrayList

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In this article, we will learn how to add an element to a particular Index of ArrayList in Java programming language.

Java Program to Add Element at Particular Index of ArrayList

This can be done by using a simple built-in method add().

It can be used in two variants –

  1. When we have to simply add an element at the end of ArrayList.
  2. When we have to add an element at the specified index.

Syntax:

public void add(int index,Object element)

Parameters:

  1. Particular Index at which element to be added.
  2. The element that should be added.

Let’s see the program to understand it clearly.

Method: Java Program to Add Element at Particular Index of ArrayList By Using add() Method

Approach –

  1. Create an ArrayList say al and add elements into it using add() method.
  2. Use the add() method for both the variants as given below.
  3. Display the updated ArrayList.

Program:

import java.util.ArrayList;
public class Main 
{
   public static void main(String[] args) 
   {

       // ArrayList of String type
       ArrayList<String> al = new ArrayList<String>();

       // simply add() methods that adds elements at the end
       al.add("This");
       al.add("is");
       al.add("a");
       al.add("Sentence");
        
        //printing arraylist before adding any new element at any index
       System.out.println("Elements before adding at Particular Index:"+ al);
       //Now, add an element to any position say 1 (position not Index)
       //So, 1st position = 0 index as indexing starts from 0
       al.add(0,"Hello");

       System.out.println("Elements after adding at Particular Index:"+ al);
       
       //again add an element to any position say 6 = 5th Index
       al.add(5, "Okay");

       //Print
       System.out.println("Elements after adding Program string :"+ al);
   }
}

Output:

Elements before adding at Particular Index:[This, is, a, Sentence]
Elements after adding at Particular Index:[Hello, This, is, a, Sentence]
Elements after adding Program string :[Hello, This, is, a, Sentence, Okay]

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