Example.java

class Node {
  private int value;
  private Node next;

  public Node(int value) {
    this.value = value;
    next = null;
  }

  public int getValue() {
    return value;
  }

  public void setNext(Node next) {
    this.next = next;
  }

  public Node getNext() {
    return next;
  }
}

class LinkedList {
  private Node head;
  private Node tail;

  public LinkedList() {
    head = null;
    tail = null;
  }

  public void add(int value) {
    Node newNode = new Node(value);

    if (tail == null) {
      tail = newNode;
      head = newNode;
    } else {
      tail.setNext(newNode);
      tail = newNode;
    }
  }

  public void print() {
    Node currentNode = head;
    while (currentNode != null) {
      System.out.println(currentNode.getValue());
      currentNode = currentNode.getNext();
    }
  }

  public int removeFromHead() {
    int val = head.getValue();

    head = head.getNext();

    return val;
  }
}

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

    list.add(10);
    list.add(20);
    list.add(30);
    list.add(40);

    System.out.println("Our list:");
    list.print();
    System.out.println();

    System.out.println("Removed: " + list.removeFromHead());
    System.out.println("Removed: " + list.removeFromHead());
    System.out.println("Removed: " + list.removeFromHead());
    System.out.println("Removed: " + list.removeFromHead());
  }
}