我需要帮助在Java中制作循环链表的int size()；方法。这就是我尝试过的。是真的吗？

public class CircularLinkedList {
    private Node head;
    private int size;

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

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

    public int size() {
        if (head == null) {
            return 0;
        }

        Node current = head;
        int count = 1;
        while (current.next != head) {
            count++;
            current = current.next;
        }

        return count;
    }

    // 其他操作方法...

    public static void main(String[] args) {
        CircularLinkedList list = new CircularLinkedList();
        // 添加节点...
        int size = list.size();
        System.out.println("循环链表的大小为：" + size);
    }
}