Java program to find the maximum and minimum value node from a linked list

public class MinMax {  
  
    //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;  
        }  
    }  
  
    //minNode() will find out the minimum value node in the list  
    public void minNode() {  
        Node current = head;  
        int min;  
  
        if(head == null) {  
            System.out.println("List is empty");  
        }  
        else {  
            //Initializing min with head node data  
            min = head.data;  
  
            while(current != null){  
                 //If current node's data is smaller than min  
                 //Then, replace value of min with current node's data  
                 if(min > current.data) {  
                     min = current.data;  
                 }  
                 current= current.next;  
            }  
            System.out.println("Minimum value node in the list: "+ min);  
        }  
    }  
  
    //maxNode() will find out the maximum value node in the list  
    public void maxNode() {  
        Node current = head;  
        int max;  
  
        if(head == null) {  
            System.out.println("List is empty");  
        }  
        else {  
            //Initializing max with head node data  
            max = head.data;  
  
            while(current != null){  
                 //If current node's data is greater than max  
                 //Then, replace value of max with current node's data  
                 if(max < current.data) {  
                     max = current.data;  
                 }  
                 current = current.next;  
            }  
            System.out.println("Maximum value node in the list: "+ max);  
        }  
    }  
  
    public static void main(String[] args) {  
  
        MinMax sList = new MinMax();  
  
        //Adds data to the list  
        sList.addNode(5);  
        sList.addNode(8);  
        sList.addNode(1);  
        sList.addNode(6);  
  
        //Display the minimum value node in the list  
        sList.minNode();  
  
        //Display the maximum value node in the list  
        sList.maxNode();  
    }  
}  

Output:

Minimum value node in the list: 1
Maximum value node in the list: 8