Given empty Linked List menultems, where would menultems.add(2, "Salsa"); place the element "Salsa"? menuItems.add("Nachos"); menuItems.add("Pizza"); menuItems.add("Pasta"); O After "Pasta" O After "Nachos" O After "Pizza" O Before "Nachos"
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- Implement LinkedListclass for this problema.Create an Employeeclass which will have details like EmployeeNo, EmployeeName and Address. You should pass value for EmployeeNo, EmployeeName and Addressthrough constructor.b.Create a method addInput( ) which will add employee details to LinkedList.c.Create method display( ) which should display all data from LinkedList using forward and reverse order using Iterator and ListIterator interfaces.d.Note:addInput( ) and display( ) should not be member functions of EmployeeclassA Maze Room : In this lab, we will make a maze game. The maze is based on Linked Lists. Instead of having one possible direction (next), we will have 4 possible directions. Rooms: Use the below code as a basis to build your own room class. Implement this class in the file room.py A room will be the basic object for our maze game. A room can have 4 doors (pertaining to north, south, east, and west). Attached to each these directions we have either another room or None (we could also imagine that the None doors are just walls). We want the player to be able to tell what room they are in. Each room will have a unique description. When the player enters a room, the program will describe the room. This way the player will know if they went back to a room that have already been to. You MAY NOT change the method's arguments/names in ANY way. class Room():def __init__(self, descr):#Description of the room to print out#These should be unique so the player knows where they areself.descr =…What does self.append(item) append to? Does it append to the linkedList? But when I run this it shows AttributeError: 'LinkedList' object has no attribute 'append' class LinkedList: def __init__(self, items: list) -> None: self._first = None for item in items: self.append(item)
- Each of the iterators must implement the java.util.Iterator interface by providing the two public methods hasNext () and next(). The Iterator interface also lists two additional methods, remove () and forEachRemaining (). These are marked as default, so the interface itself does not require implementation. Of these methods, this assignment only requires you to implement the remove () method of the linked list iterator. 1 ArrayList iterator This is an external iterator, meaning it is a public class named ICS211ArrayListIterator, and and the code is not part of the ArrayList class. Your ICS211ArrayListIterator class should have a constructor ICS211ArrayListIterator(java.util.ArrayList gives access to all the elements of the array list. This array must be saved as the value of a class variable of the iterator. data). The constructor must call one of the two toArray methods of ArrayList to obtain an array that Other than this single call to java.util.ArrayList.toArray in the constructor,…Import the ArrayList and List classes from the java.util package to create a list of phone numbers and also import the HashSet and Set classes from the java.util package to create a set of unique prefixes. Create a class called PhoneNumberPrefix with a main method that will contain the code to find the unique prefixes. Create a List called phoneNumbers and use the add method to add several phone numbers to the list. List<String> phoneNumbers = new ArrayList<>(); phoneNumbers.add("555-555-1234"); phoneNumbers.add("555-555-2345"); phoneNumbers.add("555-555-3456"); phoneNumbers.add("444-444-1234"); phoneNumbers.add("333-333-1234"); Create a Set called prefixes and use a for-each loop to iterate over the phoneNumbers list. For each phone number, we use the substring method to extract the first 7 characters, which represent the prefix, and add it to the prefixes set using the add method. Finally, use the println method to print the prefixes set, which will contain all of…Create a SameItem Interface: The SameItem interface will be a generic interface.SameItem will have a single method: isSameAs(T) that returns a boolean
- You are required to complete the LinkedList class. This class is used as a linked list that has many methods to perform operations on the linked list. To create a linked list, create an object of this class and use the addFirst or addLast or add(must be completed) to add nodes to this linked list. Your job is to complete the empty methods. For every method you have to complete, you are provided with a header, Do not modify those headers(method name, return type or parameters). You have to complete the body of the method. package chapter02; public class LinkedList { protected LLNode list; public LinkedList() { list = null; } public void addFirst(T info) { LLNode node = new LLNode(info); node.setLink(list); list = node; } public void addLast(T info) { LLNode curr = list; LLNode newNode = new LLNode(info); if(curr == null) { list = newNode; } else { while(curr.getLink() !=…A deque (pronounced “deck”) is a list-based collection that allows additions and removals to take place at both ends. A deque supports the operations addFront(x), removeFront( ), addRear(x), removeRear( ), size( ), and empty( ). Write a class that implements a deque that stores strings using a doubly linked list below. Demonstrate your class with a graphical user interface that allows users to manipulate the deque by typing appropriate commands in a JTextField component, and see the current state of the deque displayed in a JTextArea component. Consult the documentation for the JTextArea class for methods you can use to display each item in the deque on its own line. ########################################################################################################################## import java.util.Objects; public class DoublyLinkedList<E> {Node head;DoublyLinkedList() {head = new Node(null, null, null);} /** Appending the first item in the list **/public Node addFirst(E…You are going to implement a program that creates an unsorted list by using a linked list implemented by yourself. NOT allowed to use LinkedList class or any other classes that offers list functions. It is REQUIRED to use an ItemType class and a NodeType struct to solve this homework. The “data.txt” file has three lines of data 100, 110, 120, 130, 140, 150, 160 100, 130, 160 1@0, 2@3, 3@END You need to 1. create an empty unsorted list 2. add the numbers from the first line to list using putItem() function. Then print all the current keys to command line in one line using printAll(). 3. delete the numbers given by the second line in the list by using deleteItem() function. Then print all the current keys to command line in one line using printAll().. 4. putItem () the numbers in the third line of the data file to the corresponding location in the list. For example, 1@0 means adding number 1 at position 0 of the list. Then print all the current keys to command line in one…
- Exercise 2: Create a Book class; where: lo Each book contains the following information: book title, book Author name, barcode (as long integers) and book topic. 6 Implement an appropriate constructor(s) and all necessary get/set methods. Test Book class: lo Create different book objects (at least 5 books) and store them in a LinkedList sorted by book barcode value. Generate a unique random integer value for the barcode. O Iterate through the LinkedList and print out the books' details o Create a second LinkedList object containing a copy of the above LinkedList, but in reverse orderA business that sells dog food keeps information about its dog food products in a linked list. The list is named dogFoodList. (This means dogFoodList points to the first node in the list.) A node in the list contains the name of the dog food (a String), a dog food ID (also a String) and the price (a double.) a.) Create a class for a node in the list. b.) Use this class to write pseudocode or Java for a public method that prints the name of all dog foods in the list where the price is more than $20.00.Make a doubly linked list and apply all the insertion, deletion and search cases. The node willhave an int variable in the data part. Your LinkedList will have a head and a tail pointer.Your LinkedList class must have the following functions: 1) insert a node1. void insertNodeAtBeginning(int data);2. void insertNodeInMiddle(int key, int data); //will search for keyand insert node after the node where a node’s data==key3. void insertNodeAtEnd(int data);2) delete a node1. bool deleteFirstNode(); //will delete the first node of the LL2. bool deleteNode(int key); //search for the node where its data==keyand delete that particular node3. bool deleteLastNode(); //will delete the last node of the LL3) Search a node1. Node* searchNodeRef(int key); //will search for the key in the datapart of the node2. bool searchNode(int key); The program must be completely generic, especially for deleting/inserting the middle nodes. Implement all the functions from the ABOVE STATEMENTS and make a login and…