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Java program to retrieve and remove the head item from the LinkedList

Java example to retrieve and remove the head item from the LinkedList.
Submitted by Nidhi, on April 22, 2022

Problem Solution:

In this program, we will create a Linked List using the LinkedList class and store different types of elements. Then we will get and remove the first element from the list using the poll(), pollFirst() methods of the LinkedList class.

Program/Source Code:

The source code to get the last item from the LinkedList using poll(), pollFirst() methods is given below. The given program is compiled and executed successfully.

// Java program to retrieve and remove the head 
// item from the LinkedList

import java.util.LinkedList;

public class Main {
  public static void main(String[] args) {
    LinkedList list = new LinkedList();

    list.add(1);
    list.add("TWO");
    list.add(3);
    list.add("FOUR");
    list.add(true);

    System.out.println("List Items: \n" + list);
    System.out.println("Head Item: " + list.poll());
    System.out.println("List Items: \n" + list);
    System.out.println("Head Item: " + list.poll());
    System.out.println("List Items: \n" + list);
  }
}

Output:

List Items: 
[1, TWO, 3, FOUR, true]
Head Item: 1
List Items: 
[TWO, 3, FOUR, true]
Head Item: TWO
List Items: 
[3, FOUR, true]

Explanation:

In the above program, we imported the "java.util.LinkedList" package to use the LinkedList collection class. Here, we created a class Main. The Main class contains a main() method. The main() method is the entry point for the program.

In the main() method, we created an object of the LinkedList collection class to store different types of elements. Then we get and removed the first element from the linked list using the poll(), pollFirst() methods of LinkedList and printed the result.

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