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Showing content from https://www.geeksforgeeks.org/java/java-util-arraylist-add-method-java/ below:

Java ArrayList add() Method with Examples

Last Updated : 10 Dec, 2024

The add() method in the ArrayList class is used to add elements to the list. There are different versions of this method.

Example 1: In this example, we will use the add() method to add elements at the end of the list.

// Java Program to demonstrate Addition of
// Elements to an ArrayList
import java.util.*;

public class GFG {
    public static void main(String[] args) {
      
        // Creating an empty ArrayList
        ArrayList<Integer> al = new ArrayList<>();

        // Use add() method to 
        // add elements in the list
        al.add(10);
        al.add(20);
        al.add(30);

        System.out.println("" + al);
    }
}

public boolean add(Object element)

• Parameters: element: The element to be appended to the list.
• Return Type: boolean: It returns true, if the element was successfully added.

There are two versions of the ArrayList add() method i.e. one without specifying an index and another with a specified index.

The above example and syntax is without specifying an index, now let's see the implementation of the second version below:

This method inserts the specified element at a given position in the ArrayList. It shifts the current element at that position and subsequent elements to the right.

void add(int index, Object element)

Parameters:

• index: The position at which the specified element is to be inserted.
• element: The element to be inserted.

Exception: Throws IndexOutOfBoundsException if the specified index is out of range (index < 0 or index > size()).

Example:

// Java Program to demonstrate
// Addition of elements at a specified index
import java.util.*;

public class GFG {
    public static void main(String[] args) {
      
        // Creating an empty ArrayList
        ArrayList<Integer> al = new ArrayList<>();

        // Use add() method to 
        // add elements in the list
        al.add(10);
        al.add(20);
        al.add(30);
        al.add(40);

        System.out.println("" + al);

        // Adding new element 
        // at index 2
        int i = 2;
        al.add(i, 21);

        System.out.println("" + al);
    }
}

[10, 20, 30, 40]
[10, 20, 21, 30, 40]

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