Find length of circular linked list in java

Java program for Find length of circular linked list . Here problem description and explanation.

// Java program for
// Count number of nodes in circular linked list 

// Define class of linked list Node
class LinkNode
{
    public int data;
    public LinkNode next;
    public LinkNode(int data, LinkNode first)
    {
        this.data = data;
        this.next = first;
    }
}
public class CircularLinkedList
{
    public LinkNode head;
    // Class constructor
    public CircularLinkedList()
    {
        this.head = null;
    }
    // Insert node at end of circular linked list
    public void insert(int value)
    {
        // Create a new node
        LinkNode node = new LinkNode(value, this.head);
        if (this.head == null)
        {
            // First node of linked list
            this.head = node;
            node.next = this.head;
        }
        else
        {
            LinkNode temp = this.head;
            // Find the last node
            while (temp.next != this.head)
            {
                // Visit to next node
                temp = temp.next;
            }
            // Add new node at the last 
            temp.next = node;
        }
    }
    public int countNode()
    {
        if (this.head == null)
        {
            return 0;
        }
      	// Start with second node
        LinkNode temp = this.head.next;
        // This is used to count linked node
        int count = 1;
        // iterate circular linked list
        while (temp != this.head)
        {
            count += 1;
            // Visit to next node
            temp = temp.next;
        }
        return count;
    }
    public static void main(String[] args)
    {
        CircularLinkedList cll = new CircularLinkedList();
        // Add nodes
        cll.insert(1);
        cll.insert(3);
        cll.insert(5);
        cll.insert(7);
        cll.insert(9);
        cll.insert(11);
        // Display result
        System.out.println(cll.countNode());
    }
}

Output

6