The add(E element) of LinkedList appends the specified element at the end of the list. We can also add an element at a specific position using the add(int index, E element) method.

Syntax 1

public boolean add(E e)

Parameters

e is the element to be added to the linked-list

Return Value

It returns true on the successful addition of the element in this linked list.

Syntax 2

public void add(int index, E element)

Parameters

the index is the position at which element has to be inserted
element is the element to be added in this linked-list

Exception

It throws IndexOutOfBoundsException if the index is out of range. (index  size())

Program 1

import java.util.LinkedList;

public class LinkedListAddExample {

        public static void main(String[] args) {

                LinkedList oddNumbers = new LinkedList();
                oddNumbers.add(5);
                oddNumbers.add(7);
                oddNumbers.add(9);
                oddNumbers.add(11);

                System.out.println("Linked List elements: " + oddNumbers);
        }
}

Output

Linked List elements: [5, 7, 9, 11]

Program 2

import java.util.LinkedList;

public class LinkedListAddExample {

        public static void main(String[] args) {

                LinkedList oddNumbers = new LinkedList();
                oddNumbers.add(5);
                oddNumbers.add(7);
                oddNumbers.add(9);
                oddNumbers.add(11);

                System.out.println("Linked List elements: " + oddNumbers);

                oddNumbers.add(2, 15);
                System.out.println("Linked List elements after adding element at index 2: " + oddNumbers);

        }
}

Output

Linked List elements: [5, 7, 9, 11]
Linked List elements after adding element at index 2: [5, 7, 15, 9, 11]

Program 3

import java.util.LinkedList;

public class LinkedListAddExample {

        public static void main(String[] args) {

                LinkedList oddNumbers = new LinkedList();
                oddNumbers.add(5);
                oddNumbers.add(7);
                oddNumbers.add(9);
                oddNumbers.add(11);

                System.out.println("Linked List elements: " + oddNumbers);

                oddNumbers.add(6, 15);
        }
}

Output

Linked List elements: [5, 7, 9, 11]
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 6, Size: 4
        at java.util.LinkedList.checkPositionIndex(LinkedList.java:560)
        at java.util.LinkedList.add(LinkedList.java:507)
        at LinkedListAddExample.main(LinkedListAddExample.java:17)