Que20.java

public class Que20 {
    Node head;
    class Node {
        int data;
        Node next;

        Node(int d) {
            data = d;
            next = null;
        }
    }

    void printNthFromLast(int n) {
        int len = 0;
        Node temp = head;
        while (temp != null) {
            temp = temp.next;
            len++;
        }
        if (len < n)
            return;
        temp = head;
        for (int i = 1; i < len - n + 1; i++)
            temp = temp.next;
        System.out.println(temp.data);
    }
    public void push(int new_data) {
        Node new_node = new Node(new_data);
        new_node.next = head;
        head = new_node;
    }
    public static void main(String[] args) {
        Que20 lst = new Que20();
        lst.push(6);
        lst.push(8);
        lst.push(4);
        lst.push(15);
        lst.printNthFromLast(4);
    }
}