Deletion at the nth node of a Circular Linked List in Java

public class CircularLinkedListDeletion {

    // Node structure
    static class Node {
        int data;
        Node next;

        Node(int data) {
            this.data = data;
        }
    }

    static Node head = null;

    // Function to insert at the end of the circular linked list
    public static void insert(int data) {
        Node newNode = new Node(data);

        if (head == null) {
            head = newNode;
            newNode.next = head;
            return;
        }

        Node temp = head;
        while (temp.next != head) {
            temp = temp.next;
        }

        temp.next = newNode;
        newNode.next = head;
    }

    // Function to delete nth node
    public static void deleteNthNode(int n) {
        if (head == null || n <= 0) {
            System.out.println("Invalid operation");
            return;
        }

        // Case 1: Only one node in the list
        if (head.next == head && n == 1) {
            head = null;
            return;
        }

        // Case 2: Deleting the head node
        if (n == 1) {
            Node last = head;
            while (last.next != head) {
                last = last.next;
            }
            head = head.next;
            last.next = head;
            return;
        }

        // Case 3: Deleting nth node (n > 1)
        Node temp = head;
        for (int i = 1; i < n - 1; i++) {
            temp = temp.next;
            if (temp == head) {
                System.out.println("Position exceeds list length");
                return;
            }
        }

        // temp is (n-1)th node
        if (temp.next == head) {
            System.out.println("Position exceeds list length");
            return;
        }

        temp.next = temp.next.next;
    }

    // Function to print the list
    public static void printList() {
        if (head == null) {
            System.out.println("List is empty");
            return;
        }

        Node temp = head;
        do {
            System.out.print(temp.data + " ");
            temp = temp.next;
        } while (temp != head);
        System.out.println();
    }

    // Main method with example
    public static void main(String[] args) {
        insert(10);
        insert(20);
        insert(30);
        insert(40);

        System.out.println("Original Circular Linked List:");
        printList();

        int position = 3;
        deleteNthNode(position);

        System.out.println("After deleting node at position " + position + ":");
        printList();
    }
}