在Java中如何将元素插入到循环单向链表中？

public class Node {
    private int data;
    private Node next;

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

    // Getters and setters

    public static void insertElement(Node head, int element) {
        Node newNode = new Node(element);

        if (head == null) {
            newNode.setNext(newNode);
            head = newNode;
        } else {
            Node current = head;
            while (current.getNext() != head) {
                current = current.getNext();
            }
            current.setNext(newNode);
            newNode.setNext(head);
        }
    }

    public static void main(String[] args) {
        Node head = null;

        // Insert elements into the circular singly linked list
        insertElement(head, 1);
        insertElement(head, 2);
        insertElement(head, 3);

        // Print the circular singly linked list
        Node current = head;
        do {
            System.out.print(current.getData() + " ");
            current = current.getNext();
        } while (current != head);
    }
}