The peekFirst() method of LinkedList retrieves but does not remove the first element in this linked list. It returns null if the linked list is empty.

Syntax

Object peekFirst()

Parameters

It does not take any parameter

Return Value

It returns the first element in this linked-list or null if the linked-list is empty.

Program 1

import java.util.LinkedList;

public class LinkedListPeekFirstExample {

        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);
                System.out.println("First element in this linked-list: " + oddNumbers.peekFirst());
        }
}

Output

Linked List elements: [5, 7, 9, 11]
First element in this linked-list: 5

Program 2

import java.util.LinkedList;

public class LinkedListPeekFirstExample {

        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.clear();
                System.out.println("Linked List elements after clear() call: " + oddNumbers);
                System.out.println("First element in this linked-list: " + oddNumbers.peekFirst());
        }
}

Output

Linked List elements: [5, 7, 9, 11]
Linked List elements after clear() call: []
First element in this linked-list: null