Q:

Java program to add element at specific index in ArrayList

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mahmoud2506
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2022-05-07
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In this program, we are adding 5 elements (100, 200, 300, 400 and 500) to the ArrayList using "add()" method of ArrayList class.

Further, we are adding two more elements which are string type; here we will add "Hello" at index 1, "World" at index 2 and "Hi there" at index 4.

Syntax of ArrayList.add() method

ArrayList.add(index, element);

Here,

  • index - is the index of the element, where we have to add an element
  • element - is the element (item), which has to be added
  •  
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mahmoud2506
2022-05-07
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Consider the program

import java.util.ArrayList;
 
public class ExArrayList {
 
  public static void main(String[] args) {
    ////Creating object of ArrayList
    ArrayList arrList = new ArrayList();
   
    //adding data to the list
    arrList.add("100");
    arrList.add("200");
    arrList.add("300");
    arrList.add("400");
    arrList.add("500");
   
    //ading data to specified index in array list
    //we are adding "Hello" at index 1, "World" at index 2 and "Hi there" at index 4
    arrList.add(1,"Hello");
    arrList.add(2,"World");
    arrList.add(4,"Hi there");
    
    System.out.println("Array List elements: ");
    //display elements of ArrayList
    for(int iLoop=0; iLoop < arrList.size(); iLoop++)
      System.out.println(arrList.get(iLoop));
   
  }
}

Output

Array List elements: 
100
Hello
World
200
Hi there
300
400
500

 

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