Find second last element in linked list in java

Java program for Find second last element in linked list. Here problem description and other solutions.

// Java program for
// Find the second last node of a linked list

// Node of Linked List
class LinkNode
{
    public int data;
    public LinkNode next;
    public LinkNode(int data)
    {
        // Set node value
        this.data = data;
        this.next = null;
    }
}
public class SingleLL
{
    public LinkNode head;
    public LinkNode tail;
    public SingleLL()
    {
        // Set head and tail 
        this.head = null;
        this.tail = null;
    }
    // Add new node at the end of linked list
    public void insert(int value)
    {
        // Create a new node
        LinkNode node = new LinkNode(value);
        if (this.head == null)
        {
            this.head = node;
        }
        else
        {
            this.tail.next = node;
        }
        this.tail = node;
    }
    // Display linked list element
    public void display()
    {
        if (this.head == null)
        {
            return;
        }
        LinkNode temp = this.head;
        // iterating linked list elements
        while (temp != null)
        {
            System.out.print(temp.data + " → ");
            // Visit to next node
            temp = temp.next;
        }
        System.out.print("null\n");
    }
    //Find the second last node of a linked list
    public void secondLast()
    {
        LinkNode node = this.head;
        if (node == null)
        {
            System.out.print("Empty linked list");
        }
        else if (node.next == null)
        {
            System.out.print("Only one node in this linked list");
        }
        else
        {
            // Find second last node
            while (node.next != null && node.next.next != null)
            {
                // Visit to second next node
                node = node.next.next;
            }
            System.out.println("Second last element is : " + node.data);
        }
    }
    public static void main(String[] args)
    {
        SingleLL sll = new SingleLL();
        // Add linked list node
        sll.insert(6);
        sll.insert(3);
        sll.insert(2);
        sll.insert(7);
        sll.insert(1);
        sll.insert(9);
        System.out.println("Linked List");
        // 6 → 3 → 2 → 7 → 1 → 9 → null
        sll.display();
        sll.secondLast();
    }
}

Output

Linked List
6 → 3 → 2 → 7 → 1 → 9 → null
Second last element is : 1