Java LinkedList pollFirst() Method Example

In our previous article we have learnt about poll() method of java.util.LinkedList class which will get us the first element(head) of the list and at the same time it will remove that element from the list. pollFirst() method also performs the same operation as poll() does, retrieves and removes the first element of the list.

Signature

public E pollFirst()

This method retrieves and removes the first element of the list and will return null if the list is empty.

Example

The following example shows the usage of LinkedList.pollFirst() method.

import java.util.LinkedList;

public class PollFirstMethodLinkedListExample {
	public static void main(String args[])
	{
		// create an empty LinkedList
		LinkedList list1= new LinkedList();
		
		// use add() method to add elements to the LinkedList
		list1.add("Element1");
		list1.add("Element2");
		list1.add("Element3");

		//Printing the elements of the LinkedList list1
		System.out.println("**Elements of the list1 before pollFirst**");
		for(String temp:list1)
		{
			System.out.println(temp);
		}
		
		//Removing the head of the list
		list1.pollFirst();
		
		//Printing the elements of the LinkedList list1
		System.out.println("**Elements of the list1 after pollFirst**");
		for(String temp:list1)
		{
			System.out.println(temp);
		}
	}
}

Output

**Elements of the list1 before poll**
Element1
Element2
Element3
**Elements of the list1 after poll**
Element2
Element3

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