Consider a linked list is already created and write a method that traverses the list and delete the node immediately preceding a node with a negative value.
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- Q2: Write a method to insert an element at index in a Doubly Linked List data structure and test it. The method receives this list by parameters. In JavaGiven main() in the ShoppingList class, define an insertAtEnd() method in the ItemNode class that adds an element to the end of a linked list. DO NOT print the dummy head node. Ex. if the input is: 4 Kale Lettuce Carrots Peanuts where 4 is the number of items to be inserted; Kale, Lettuce, Carrots, Peanuts are the names of the items to be added at the end of the list. The output is: Kale Lettuce Carrots Peanuts public class ItemNode { private String item; private ItemNode nextNodeRef; // Reference to the next node public ItemNode() { item = ""; nextNodeRef = null; } // Constructor public ItemNode(String itemInit) { this.item = itemInit; this.nextNodeRef = null; } // Constructor public ItemNode(String itemInit, ItemNode nextLoc) {…implement this method: numOccurrencesRec(LNode node, int n, int key) – This method takes as parameters a reference to the head of a linked list, a position specified by n, and a key. It returns the number of occurrences of the key in the linked list beginning at the n-th node. If n = 0, it means you should search in the entire linked list. If n = 1, then you should skip the first node in the list.
- java program java method: Write a method replace to be included in the class KWLinkedList (for doubly linked list) that accepts two parameters, searchItem and repItem of type E. The method searches for searchItem in the doubly linked list, if found then replace it with repItem and return true. If the searchItem is not found in the doubly linked list, then insert repItem at the end of the linked list and return false. Assume that the list is not empty. You can use ListIterator and its methods to search the searchItem in the list and replace it with repItem if found. Do not call any method of class KWLinkedList to add a new node at the end of the list. Method Heading: public boolean replace(E searchItem, E repItem) Example: searchItem: 15 repItem: 17 List (before method call): 9 10 15 20 4 5 6 List (after method call) : 9 10 17 20 4 5 6Java Given main() in the ShoppingList class, define an insertAtEnd() method in the ItemNode class that adds an element to the end of a linked list. DO NOT print the dummy head node. Ex. if the input is: 4 Kale Lettuce Carrots Peanuts where 4 is the number of items to be inserted; Kale, Lettuce, Carrots, Peanuts are the names of the items to be added at the end of the list. The output is: Kale Lettuce Carrots Peanuts Second image is ItemNodeConsidering a single linked list class, write a method to check whether it contains a number dvisable by three, if so move it to the end of the list. Public void divd30{
- JAVA please Given main() in the ShoppingList class, define an insertAtEnd() method in the ItemNode class that adds an element to the end of a linked list. DO NOT print the dummy head node. Ex. if the input is: 4 Kale Lettuce Carrots Peanuts where 4 is the number of items to be inserted; Kale, Lettuce, Carrots, Peanuts are the names of the items to be added at the end of the list. The output is: Kale Lettuce Carrots Peanuts Code provided in the assignment ItemNode.java:Implement a class “LinkedList” which has two private data members head: A pointer to the Node class length: length of the linked listImplement the following private method: 1. bool InsertHead(int data); // Use InsertAt FunctionInsert at the start of the linked list. Return true2. bool InsertEnd(int data); // Use InsertAt FunctionInsert at the end of the linked list. Return true3. bool RemoveAt(int index);Remove and delete the node at position “index”. Return true if successful, otherwise, false. this in c++Write a method and test it to insert an array of elements at index in a single linked list and then display this list. The method receives this array and index by parameters. By using java language
- Complete this missing methods using Java: public boolean contains(int value) Write a method contains that accepts a value and returns true if the value exists in the linked list, otherwise it returns false 2. public void set(int index, int value) Write a method set that accepts an index and a value and sets the list's element at that index to have the given value. You may assume that the index is between 0 (inclusive) and the size of the list (exclusive). 3.public boolean isSorted() Write a method isSorted that returns true if the list is in sorted (nondecreasing) order and returns false otherwise. An empty list is considered to be sorted. 4. public int deleteBack() Write a method deleteBack that deletes the last value (the value at the back of the list) and returns the deleted value. If the list is empty, your method should throw a…Part 1: ] Implement a linked list of integers as aclass LinkedList. Build the following methods:✓ print that prints the content of the linked list;✓ addFirst that adds a new node to the beginning (the head) of thelinked list;✓ addLast that adds a new node to the end (the tail) of the linked list;✓ indexOf that finds a specific node by its value, and returns node’sindex (node’s position from the left in the linked list); if the valueis not present in the linked list, it returns −1;✓ deleteFirst that deletes the first node in the linked list;✓ deleteLast that deletes the last node in the linked list.Test your class creating a list in the main and1) adding one by one nodes 2, 4, 8 to the tail;2) adding nodes -2, -8 to the head;3) adding a node 9 to the tail;4) printing the list;5) printing indexOf(4);6) printing contains(9);7) deleting one by one all the nodes in the list – either from the tail orfrom the head – and printing the result after each deletion. PLEASE WRITE CODE IN JAVA…Part 1: ] Implement a linked list of integers as aclass LinkedList. Build the following methods:✓ print that prints the content of the linked list;✓ addFirst that adds a new node to the beginning (the head) of thelinked list;✓ addLast that adds a new node to the end (the tail) of the linked list;✓ indexOf that finds a specific node by its value, and returns node’sindex (node’s position from the left in the linked list); if the valueis not present in the linked list, it returns −1;✓ deleteFirst that deletes the first node in the linked list;✓ deleteLast that deletes the last node in the linked list.Test your class creating a list in the main and1) adding one by one nodes 2, 4, 8 to the tail;2) adding nodes -2, -8 to the head;3) adding a node 9 to the tail;4) printing the list;5) printing indexOf(4);6) printing contains(9);7) deleting one by one all the nodes in the list – either from the tail orfrom the head – and printing the result after each deletion. PLEASE WRITE CODE IN JAVA…