LinkedList remove last element.java

class Node {
    int data;
    Node next;

    Node(int data) {
        this.data = data;
        this.next = null;
    }
}
public class LinkedList {
    Node head = null;
    public void add(int element) {
        Node newNode = new Node(element);
        if (head == null) {
            head = newNode;
        } else {
            Node temp = head;
            while (temp.next != null) {
                temp = temp.next;
            }
            temp.next = newNode;
        }
    }
    public void removeLast() {
        if (head == null) {
            System.out.println("List is already empty.");
            return;
        }
        if (head.next == null) {
            head = null;
            return;
        }
        Node temp = head;
        while (temp.next.next != null) {
            temp = temp.next;
        }
        temp.next = null;
    }
    public void display() {
        if (head == null) {
            System.out.println("List is empty.");
            return;
        }
        Node temp = head;
        while (temp != null) {
            System.out.print(temp.data + " -> ");
            temp = temp.next;
        }
        System.out.println("NULL");
    }

    public static void main(String[] args) {
        LinkedList list = new LinkedList();
        list.add(5);
        list.add(10);
        list.add(15);
        list.add(20);

        System.out.println("Original Linked List:");
        list.display();
        list.removeLast();
        System.out.println("\nAfter removing last element:");
        list.display();
    }
}