The nodes in a reference-based singly linked list can be made inaccessibl setting the head reference to null. A reference-based implementation of the ADT List imposes a fixed maxin length on the list.
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- import java.util.ArrayList; /** * This class describes a user of Twitter. A user has a user ID * (e.g. @testudo), a list of tweets, a count of the number of followers, * and a list of users that this user follows. Unlike P5, * there is no upper limit on the number of tweets or users to follow. * * You may NOT import any library class other than java.util.ArrayList. * You may NOT add any instance variables to keep a count of the number * of tweets or users being followed. You may add instance variables * for other purposes as long as they are private. */public class TwitterUser { private String userID; private int followers; private ArrayList<Tweet> listTweets; private ArrayList<TwitterUser> toFollow; /** * A constructor that takes the user's ID. If the ID is null, or * longer than 32 characters, or it does not start with "@", * throw an IllegalArgumentException. * * All other instance variables should be initialized…Create a SameItem Interface: The SameItem interface will be a generic interface.SameItem will have a single method: isSameAs(T) that returns a booleanPlease, help me to do this in Java. Create a program to view the waiting list. The list (5 entries) is created in the program and is an object of the LinkedList class. The list entry is a QueuePerson object that contains the queue's last name, first name, and patronymic fields (of type String), an AddressValue field for the queue's address, and queue priority (int type). In turn, the field of the AddressValue type contains three fields of the String type: the name of the city, the name of the street and the house number, as well as an int type field - the apartment number (if the apartment number is 0, the house in which the subject lives does not have apartments). Entries in the queue are sorted according to priority, and the queue is added last in the queue of its priority. Provide the possibility of receiving so that there is no repetition in the queue by the name of the person on the waiting list, for which use TreeSet.
- Java Program: There are errors in the lexer and shank file. Please fix those errors and there must be no error in any of the code at all. Below is the lexer, shank, and token files. The shank file is the main method. There is a rubric attached as well. Lexer.java import java.util.ArrayList;import java.util.HashMap;import java.util.List; import mypack.Token.TokenType; public class Lexer { private static final int INTEGER_STATE = 1;private static final int DECIMAL_STATE = 2;private static final int IDENTIFIER_STATE = 3;private static final int SYMBOL_STATE = 4;private static final int ERROR_STATE = 5;private static final int STRING_STATE = 6;private static final int CHAR_STATE = 7;private static final int COMMENT_STATE = 8; private static final char EOF = (char) -1; private static String input;private static int index;private static char currentChar;private static int lineNumber = 1;private static int indentLevel = 0;private static int lastIndentLevel = 0; private static…JAVA Create a new class HashMapManipulation with a main method. Import the necessary classes from the java.util package, including the HashMap class. Create a HashMap object, named mapand use the put() method to add key-value pairs to the map. The keys are strings "A", "B", and "C", and the values are integers 1, 2, and 3 respectively. Use the size() method to print the size of the map. Use a for loop to print the key-value pairs in the map. The loop should iterate over the entries in the map using the entrySet() method, which will return a set of Map.Entry objects representing the key-value pairs in the map. The key and value of each entry are printed using the getKey() and getValue() methods, respectively. Use theget() method to get the value of key "A", and assigns it to a variable value. The value is then printed. Use the put() method to add a new key-value pair to the map. The key is "D" and the value is 4. The map is then printed again, to show the added key-value…Consider the LinkedList in the given figure. Assume that the nodes are objects of the ListNode class given below. Assume further that list, ptr1 and ptr2 are reference variables of the ListNode type. Write a Java statement (one statement only) to make ptr2 point to the node containing the info 44. * list 18 32 23 16 43 25 44 . null ptri ptr2 public class ListNode<T> { private T info; private ListNode<T> link; public ListNode(T info, ListNode<T> link) { this. info = info; this.link = link; public void setInfo(T info) { this. info = info; public void settink(ListNode<T> link) { this.link = link; public T getInfo() { return info; public ListNode<T> getlink() { return link;
- A 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 =…Java Collection Framework. (https://docs.oracle.com/javase/8/docs/technotes/guides/collections/overview.html) A collectionis an object that represents a group of objects. There are several classes that implement the collection interface. Examples of them are ArrayList, HashMap and LinkedList. Please make a report for each of ArrayList, HashMap and LinkedList including the description of the class and its major methods. Please specify the 3 real world problems to apply each class (ArrayList, HashMap and LinkedList). Make 3 code snippets to solve the real-world problem. The code snippet can be written in pseudo code. In the code snippets, please create an instance of each of the class, and use its key methods. Make sure the # of key methods in use for each class should be over 6.Python For this assignment, you will write a program to allow the user to store the names and phone numbers of their contacts. Create the following classes: Contact: two attributes. One for the contact's name and the contact's phone number. Node: two attributes: _data and _next. For use in a linked list. ContactList: One attribute: _head, a reference to the head of an internal linked list of Node objects. Note: self._head is an attribute of the class, so any method which updates the internal linked list can simply update the list self._head references. There is no need to return anything like we did in methods such as add_to_end in the lecture. Note also that for the same reason, we do not have to pass a reference to the head of the list to any method, because each method should already have access to the self._head attribute. ContactList should also have the following methods: add(name, new_number). Creates a new Node with a Contact object as its _data. The new Node is then added…
- 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 EmployeeclassIn Java, Question 15: Answer the following questions You are asked to Implement an ADT for MyQueue. The following is a class definition of a linked list Node: class Node { String content; Node next; } The following is a class definition of a linked list MyQueue: class MyQueue { Node head; } Implement the following methods for your class MyQueue. a) Constructor that does not requre any parameters b) Constructor that accepts a parameter of type MyQueue and creates a new instance of MyQueue that is a clone of the one passed as parameter c) public int AppendCopy method that accepts a single parameter of type MyQueue and clones all elements from the MyQueue instance passed as a parameter and appends them to the instance on which we called the method. Return the number of elements that are cloned and appended d) public int FindElements(String filter) - finds all elements that match the filter and returns their count e) overload the FindElementsmethod to include a…Complete the following class with the appropriate methods shown in the rubric import java.util.HashMap; import java.util.Set; /** * Stores and manages a map of users. * * @author Java Foundations * @version 4.0 */ public class Users { privateHashMap<String, User> userMap; /** * Creates a user map to track users. */ publicUsers() { userMap = newHashMap<String, User>(); } /** * Adds a new user to the user map. * * @param user the user to add */ publicvoidaddUser(Useruser) { userMap.put(user.getUserId(), user); } /** * Retrieves and returns the specified user. * * @param userId the user id of the target user * @return the target user, or null if not found */ publicUsergetUser(StringuserId) { returnuserMap.get(userId); } /** * Returns a set of all user ids. * * @return a set of all user ids in the map */ publicSet<String> getUserIds() { returnuserMap.keySet(); } }