LinkedList pollFirst() method with example in java

The pollFirst() method of LinkedList retrieves and removes the first element of this linked list. It returns null if this list is empty.

Syntax

Object pollFirst()

Parameters

It does not take any parameter

Return Value

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

Program 1

import java.util.LinkedList;

public class LinkedListPollFirstExample {

	public static void main(String[] args) {

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

		System.out.println("Linked List elements: " + oddNumbers);
		oddNumbers.pollFirst();
		System.out.println("Linked List elements after removing first element: " + oddNumbers);
	}
}

Output

Linked List elements: [5, 7, 9, 11]
Linked List elements after removing first element: [7, 9, 11]

Program 2

import java.util.LinkedList;

public class LinkedListPollFirstExample {

	public static void main(String[] args) {

		LinkedList<Integer> 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.pollFirst());
	}
}

Output

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