In Java: Modify the attached program code below According to the question a, b and c a. Replace the appendNode() method by an insertNode() method which inserts the new node in such a way to keep the list always sorted in increasing order. b. Add a recursive method displayReverse() which displays the list in reverse order. c. Do the needed changes to the main()in order to reflect the above two changes.


In Java: Modify the attached program code below According to the question a, b and c

a. Replace the appendNode() method by an insertNode() method which inserts the new node in such a way to keep the list always sorted in increasing order.

b. Add a recursive method displayReverse() which displays the list in reverse order.

c. Do the needed changes to the main()in order to reflect the above two changes.

public class DoublyLinkedList {
private Node head;
private Node tail;
private int size;
DoublyLinkedList() {
tail = head = null;
size = 0;

public void addNode(String item) {
//adding a node at the end
Node newNode = new Node(item);
if(head == null) {
head = tail = newNode;
else {
newNode.prev = tail; = newNode;
tail = newNode;
public boolean remove(String item) {
Node current = head;
boolean found = false;
while((current != null)&&(!found)) {
found = true;
current =;
if(current == head) head =;
if(current == tail) tail = tail.prev;
if(current.prev != null) =;
if( != null) = current.prev;
return found;
public boolean isEmpty() {
return size == 0;

public void display() {
if(head == null)
System.out.println("\nThe list is empty!");
Node current = head;
while(current != null) {
current =;
public void clearList() {
head = tail = null;
size = 0;

import java.util.Scanner;

public class LinkedListsExample {

public static void main(String[] args) {
// prompt user repeatedly to select an action (add, remove, display)
DoublyLinkedList list = new DoublyLinkedList();
Scanner in = new Scanner(;
String choice;
String element;
do {
System.out.println("\nSelect one of the following actions:\n");
System.out.println("D: Display list");
System.out.println("A: Append an element to the list");
System.out.println("R: Remove an element from the list");
System.out.println("C: clear the list");
System.out.println("Q: Quit");
System.out.print("\nEnter your choice: ");
choice = in.nextLine();
else if(choice.equalsIgnoreCase("A"))
System.out.print("\nEnter a string to append to the list: ");
element = in.nextLine();
else if(choice.equalsIgnoreCase("R"))
System.out.print("\nEnter a string to remove from the list: ");
element = in.nextLine();
System.out.println("\nThe string " + element + " was not found!");
else if(choice.equalsIgnoreCase("C"))
else if(choice.equalsIgnoreCase("Q"))
System.out.println("\nInvalid choice. Try again!");
} while(true);

public class Node {
String element;
Node prev;
Node next;
public Node(String newElement) {
element = newElement;
prev = next = null;

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