Java Program to search an element in a singly linked list

public class SearchLinkedList {  
    //Represent a node of the singly linked list  
    class Node{  
        int data;  
        Node next;  
        public Node(int data) {  
            this.data = data;  
            this.next = null;  
        }  
    }  
    //Represent the head and tail of the singly linked list  
    public Node head = null;  
    public Node tail = null;  
    //addNode() will add a new node to the list  
    public void addNode(int data) {  
        //Create a new node  
        Node newNode = new Node(data);  
        //Checks if the list is empty  
        if(head == null) {  
            //If list is empty, both head and tail will point to new node  
            head = newNode;  
            tail = newNode;  
        }  
        else {  
            //newNode will be added after tail such that tail's next will point to newNode  
            tail.next = newNode;  
            //newNode will become new tail of the list  
            tail = newNode;  
        }  
    }  
    //searchNode() will search for a given node in the list  
    public void searchNode(int data) {  
        Node current = head;  
        int i = 1;  
        boolean flag = false;  
        //Checks whether list is empty  
        if(head == null) {  
            System.out.println("List is empty");  
        }  
        else {  
            while(current != null) {  
                 //Compares node to be found with each node present in the list  
                if(current.data == data) {  
                    flag = true;  
                    break;  
                }  
                i++;  
                current = current.next;  
            }  
        }  
        if(flag)  
             System.out.println("Element is present in the list at the position : " + i);  
        else  
             System.out.println("Element is not present in the list");  
    }  
  
    public static void main(String[] args) {  
  
        SearchLinkedList sList = new SearchLinkedList();  
  
        //Add nodes to the list  
        sList.addNode(1);  
        sList.addNode(2);  
        sList.addNode(3);  
        sList.addNode(4);  
  
        //Search for node 2 in the list  
        sList.searchNode(2);  
        //Search for a node  in the list  
        sList.searchNode(7);  
    }}  

Output:

Element is present in the list at the position: 2
Element is not present in the list