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

Program:

public class MinMax {  
    //Represents the node of list.  
    public class Node{  
        int data;  
        Node next;  
        public Node(int data) {  
            this.data = data;  
        }  
    }  
  
    //Declaring head and tail pointer as null.  
    public Node head = null;  
    public Node tail = null;  
  
    //This function will add the new node at the end of the list.  
    public void add(int data){  
        //Create new node  
        Node newNode = new Node(data);  
        //Checks if the list is empty.  
        if(head == null) {  
             //If list is empty, both head and tail would point to new node.  
            head = newNode;  
            tail = newNode;  
            newNode.next = head;  
        }  
        else {  
            //tail will point to new node.  
            tail.next = newNode;  
            //New node will become new tail.  
            tail = newNode;  
            //Since, it is circular linked list tail will points to head.  
            tail.next = head;  
        }  
    }  
  
    //Finds out the minimum value node in the list  
    public void minNode() {  
        Node current = head;  
        //Initializing min to initial node data  
        int min = head.data;  
        if(head == null) {  
            System.out.println("List is empty");  
        }  
        else {  
             do{  
                 //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;  
            }while(current != head);  
  
            System.out.println("Minimum value node in the list: "+ min);  
        }  
    }  
  
    //Finds out the maximum value node in the list  
    public void maxNode() {  
        Node current = head;  
        //Initializing max to initial node data  
        int max = head.data;  
        if(head == null) {  
            System.out.println("List is empty");  
        }  
        else {  
             do{  
                 //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;  
                }while(current != head);  
  
            System.out.println("Maximum value node in the list: "+ max);  
        }  
    }  
  
    public static void main(String[] args) {  
        MinMax cl = new MinMax();  
        //Adds data to the list  
        cl.add(5);  
        cl.add(20);  
        cl.add(10);  
        cl.add(1);  
        //Prints the minimum value node in the list  
        cl.minNode();  
        //Prints the maximum value node in the list  
        cl.maxNode();  
    }  
}  

Output:

Minimum value node in the list: 1
Maximum value node in the list: 20