Write and test an efficient Java/Python method for reversing a doubly linked list L using only a constant amount of additional space. Hint: Add the method to DoublyLinkedList class
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Write and test an efficient Java/Python method for reversing a doubly linked list L using only a constant amount of additional space. Hint: Add the method to DoublyLinkedList class.
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- Using Java, modify the doubly linked list class presented below so it works with generic types. Add the following methods drawn from the java.util.List interface:• void clear(): remove all elements from the list.• E get(int index): return the element at position index in the list.• E set(int index, E element): replace the element at the specified position with the specified element and return the previous element. Test your generic linked list class by processing a list of numbers of type double. ====================================/**The DLinkedList class implements a doubly Linked list. */class DLinkedList {/**The Node class stores a list element and a reference to the next node.*/private class Node{String value; // Value of a list elementNode next; // Next node in the listNode prev; // Previous element in the list/**Constructor. @param val The element to be stored in the node.@param n The reference to the successor node.@param p The reference to the predecessor node.*/ Node(String…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…Implement 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. Node* GetNode(int index) const;A private function which is only accessible to the class methods. . For example, index 0 corresponds to the head and index length-1 corresponds to end node of the linked list. The function returns NULL if the index is out of bound.Implement the following public methods:2. LinkedList();Constructor that sets head to NULL and length equal to zero.3. bool InsertAt(int data, int index);Insert a new node at the index. Return true if successful, otherwise,return false. The new node should be at the position “index” in the linked list after inserting it. You might have to use GetNode private function. these 3 parts
- Write a Java class myLinkedList to simulate a singly linked list using arrays as the underlying structure. Include the following methods: 1. insert an element within the linked list.(this should also work for the front and the rear of the list) 2. Remove an element from the linked list 3. Display (print) the elements of the linked list in order. 4. A method to check if the list is "empty". Test your solution using a linked list that initially has the characters A, B, D, E, F, and G. Insert "C" between B and D. Remove element "F". [Hint: One solution (recommended) is to use 2 arrays. One for the data, and the other for the "next" pointer. Also, consider using dummy nodes for the front, and possibly the rear of the list] Extend the solution so that it simulates a doubly linked list! (hint: You will need a third array to represent the "backward" pointers)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++Implement a Doubly linked list to store a set of Integer numbers (no duplicate) • Instance variable• Constructor• Accessor and Update methods 3. Define TestDLinkedList Classa. Declare an instance of Doubly List class. b. Test all the methods of Doubly List class.
- 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 6In python. Write a LinkedList class that has recursive implementations of the add and remove methods. It should also have recursive implementations of the contains, insert, and reverse methods. The reverse method should not change the data value each node holds - it must rearrange the order of the nodes in the linked list (by changing the next value each node holds). It should have a recursive method named to_plain_list that takes no parameters (unless they have default arguments) and returns a regular Python list that has the same values (from the data attribute of the Node objects), in the same order, as the current state of the linked list. The head data member of the LinkedList class must be private and have a get method defined (named get_head). It should return the first Node in the list (not the value inside it). As in the iterative LinkedList in the exploration, the data members of the Node class don't have to be private. The reason for that is because Node is a trivial class…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
- java Usig linked lists and iterators Write a method called buildnames that accepts two Lists of strings as its parameters and returns a new List of strings containing augmentation of first names from first list with last names from second list, i.e: List1 has a list of first names, List2 has list of last names. outputList has a list of full name (first names + space + last names)Implement a Single linked list to store a set of Integer numbers (no duplicate) Using Java lanaguage• Instance variable• Constructor• Accessor and Update methods 3. Define TestSLinkedList Classa. Declare an instance of the Single List class.b. Test all the methods of the Single List class.The curly bracket used in java to enclose units of code can not be used in a fill in questions. For this questions the curly brackets will be substituted with comments. Interpret the begin and end comments as curly brackets. Complete the code for the method filter. The method receives two parameter of generic type E called low and high. The method filters the elements within the linked list and return a linked list with all the elements from the low value to the high value. Example: [1,2,4,5,8,9,11,12] Called with low = 2 and high =10 will return [2,4,5,8,91. public //begin method MyLinkedList newlist = 0; Node befPtrD if(this. ==null) return newlist; for (Node clptr= //begin for if && //begin if newlist.append(clptr.element); if( head=head.next; else if(clptr==tail) +ail-bofPtr