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Java program to create a Circular Linked List of n nodes and display it in reverse order

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robaa
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2022-11-12
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In this program, we create a circular linked list, then traverse the list in the reverse order and print the nodes.

Algorithm

  • Define a Node class which represents a node in the list. It has two properties data and next which will point to the next node.
  • Define another class for creating the circular linked list and it has two nodes: head and tail. It has two methods: add(), display() and reverse().
  • add() will add a node to the list:
    • It first checks whether the head is null, then it will insert the node as the head.
    • Both head and tail will point to the newly added node.
    • If the head is not null, the new node will be the new tail, and new tail will point to head as it is a circular linked list.

a. display() will show all the nodes present in the list.

  • Define a new node 'current' that will point to the head.
  • Print current.data till current will points to head again.
  • Current will point to the next node in the list in each iteration.

a. reverse() will print the circular linked list in reverse order.

  • This method checks whether next node to current is head which implies that, current is pointing to tail, then it will print the data of the tail node.
  • Recursively call reverse() by considering node next to current node and prints out all the nodes in reverse order starting from the tail.
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robaa
2022-11-12
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Program:

public class ReverseList {  
            //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 point to head.  
                    tail.next = head;  
                }  
            }  
  
            //Displays all the nodes in the list  
            public void display() {  
                Node current = head;  
                if(head == null) {  
                    System.out.println("List is empty");  
                }  
                else {  
                     do{  
                        //Prints each node by incrementing pointer.  
                        System.out.print(" "+ current.data);  
                        current = current.next;  
                    }while(current != head);  
                    System.out.println();  
                }  
            }  
  
            //Reverse the order of the nodes present in the list.  
            public void reverse(Node current) {  
                //Checks if the next node is head, if yes then prints it.  
                if(current.next == head) {  
                    System.out.print(" "+current.data);  
                    return;  
                }  
                //Recursively calls the reverse function  
                reverse(current.next);  
                System.out.print(" "+current.data);  
            }  
  
            public static void main(String[] args) {  
                ReverseList cl = new ReverseList();  
                cl.add(1);  
                cl.add(2);  
                cl.add(3);  
                cl.add(4);  
                cl.add(5);  
                cl.add(6);  
                System.out.println("Original List: ");  
                cl.display();  
                System.out.println("Reversed List: ");  
                //Print reversed list  
                cl.reverse(cl.head);  
            }  
}

Output:

Original List: 
1 2 3 4 5 6
Reversed List: 
6 5 4 3 2 1

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