Insertion of Single Link List at Beginning

package DataS;

public class Single_Link_Beginning {

    // Node class representing each element of the linked list
    static class Node {
        int data;          // Data stored in the node
        Node next;         // Pointer to the next node in the list

        // Constructor to create a new node
        Node(int data) {
            this.data = data;
            this.next = null;
        }
    }

    Node head; // Head of the list

    // Constructor to initialize an empty list
    public Single_Link_Beginning() {
        head = null;
    }

    // Function to insert a node at the beginning of the list
    public void insertAtBeginning(int data) {
        // Create a new node with the given data
        Node newNode = new Node(data);
        // Point the new node's next to the current head
        newNode.next = head;
        // Update head to the new node
        head = newNode;
    }

    // Function to print the linked list
    public void printList() {
        Node current = head; // Start from the head
        // Traverse the list until the end
        while (current != null) {
            System.out.print(current.data + " -> ");
            current = current.next;
        }
        System.out.println("NULL");
    }

    // Main method to demonstrate the insertion
    public static void main(String[] args) {
        Single_Link_Beginning list = new Single_Link_Beginning();

        // Insert nodes at the beginning
        list.insertAtBeginning(01);
        list.insertAtBeginning(20);
        list.insertAtBeginning(25);

        // Print the linked list
        list.printList();
    }
}