Exercise 2: Create a Book class; where: Each book contains the following information: book title, book Author name, barcode (as long integers), and book topic. o Implement an appropriate constructor(s) and all necessary get/set methods. Test Book class: 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. Iterate through the LinkedList and print out the books' details Create a second LinkedList object containing a copy of the above LinkedList, but in reverse order.
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- In java A supermarket wants to reward its best customer of each day, showing the customer’s name on a screen in the supermarket. For that purpose, the store keeps an ArrayList.Create a class customer having id, name, gender, and bill provide appropriate getters/setters and constructors also provide toString method.In the Store class, make an ArrayList of customers, store name, and address implement methods public void addSale(Customer c) that will add customers to the arraylist.public void RemoveCustomer(int id);public void UpdateCustomerRecord(int Id);public displayAll();public String nameOfBestCustomer() to record the sale and return the name of the customer with the largest sale. public ArrayList nameOfBestCustomers(int topN) so that it displays the top customers, that is, the topN customers with the largest sales, where topN is a value that the user of the program supplies. Write a program that prompts following menu and ============================================…create a class called Dwarf that has a name (String) and a height (int). In addition, when Dwarfs are placed in a LinkedList and sorted, they will be sorted from tallest to shortest. import java.util.*; public class Main{ public static void main(String[] args) { ArrayList<Dwarf> l = new ArrayList<Dwarf>(); l.add(new Dwarf("Sleepy", 14)); l.add(new Dwarf("Dopey", 17)); l.add(new Dwarf("Doc", 9)); l.add(new Dwarf("Happy", 22)); l.add(new Dwarf("Sneezy", 29)); l.add(new Dwarf("Bashful", 11)); l.add(new Dwarf("Grumpy", 4)); Collections.sort(l); for (Dwarf d : l) System.out.println(d.getName()); }} output Sneezy Happy Dopey Sleepy Bashful Doc GrumpyJAVA 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…
- Computer Science Write a program in the Java language that includes: 1. A class for books, taking into account the encapsulation and getter, setter. 2. Entering books by the user using Scanner 3. LinkedList class for: (Adding a new book - Inserting a book- Searching for a book using the ISBN Number - Viewing all books,delete book). 4. Serial number increases automatically with each book that is entered. 5. Printing the names of books is as follows: Serial - ISBN - Name - PubYear - Price - Notes. 6-Design a main menu that includes: • Add Book • Insert Book • Delete Book • Search . Display . ExitWrite a class called Pokemon that has a name (e.g. “Pikachu”) and a number (e.g. 25). Implement a constructor that takes both values as parameters. Implement accessors for both values. Implement a toString() that returns a string in the format “Name(number)”, e.g. “Pikachu(25)”. Implement an equals(Object) method (two Pokémon are considered equal if they have the same number). Implement a hashCode() method that returns the number.(remember the equals and hashCode contract).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…
- A supermarket wants to reward its best customer of each day, showing the customer’s name on a screen in the supermarket. For that purpose, the store keeps an ArrayList.Create a class customer having id, name, gender, and bill provide appropriate getters/setters and constructors also provide toString method.In the Store class, make an ArrayList of customers, store name, and address implement methods public void addSale(Customer c) that will add customers to the arraylist.public void RemoveCustomer(int id);public void UpdateCustomerRecord(int Id);public displayAll();public String nameOfBestCustomer() to record the sale and return the name of the customer with the largest sale. public ArrayList nameOfBestCustomers(int topN) so that it displays the top customers, that is, the topN customers with the largest sales, where topN is a value that the user of the program supplies. Write a program that prompts following menu and ============================================…(Implement MyLinkedList) The implementations of the methods contains(E e), get(int index), indexOf(E e), lastIndexOf(E e), and set(int index, E e) are omitted in the MyLinkedList class. Implement these methods. Define a new class named MyLinkedListExtra that extends MyLinkedListto override these methods. Test your new MyList class using the code at import java.util.*; public class Exercise24_02 { public static void main(String[] args) { new Exercise24_02(); } public Exercise24_02() { String[] names = {"Tom", "Susan", "Kim", "George", "Peter", "Jean", "George", "Jane", "Denise", "Jenny", "Susan", "Kathy", "Jane"}; MyList<String> list = new MyLinkedListExtra<>(names); System.out.println(list); Scanner input = new Scanner(System.in); System.out.print("Enter a name: "); String name = input.next(); System.out.print("Enter an index: "); int index = input.nextInt(); System.out.println(name + " is in the list? " +…Assume we have Dessert.java whcih private String flavor has private double sweetness in it. Store.java This will be the class that stores the data for the dessert store. We are assuming that a store can sell all kinds of dessert. Variables: String name – name of the store. ArrayList desserts – an ArrayList of type Dessert Constructor(s): • A constructor that only takes in name and creates an empty ArrayList of type Dessert. Methods: • addDesserto This method should take in a valid Dessert object and add it to the back of the ArrayList. o This method should not return anything.o This method should run in O(1) time. • removeDesserto This method should take in a valid Dessert object and remove the first instance of it from the ArrayList. o Return the object that is being removed or null if the dessert is not found. o Use equals when identifying if the object in the ArrayList is the same as the passed in Dessert object. o This method should run in O(n) time. • findDessert o…
- 10.5 LAB: Count probations (EO) Students are put on probation if their GPA is below 2.0. Complete the Course class by implementing the countProbation() method, which returns the number of students with a GPA below 2.0. Given classes: Class Course represents a course, which contains an ArrayList of Student objects as a course roster. (Type your code in here) Class Student represents a classroom student, which has three fields: first name, last name, and GPA. Hint: Refer to the Student class to explore the available methods that can be used for implementing the countProbation() method. Ex: If the following students and their GPA values are added to a course: Henry Cabot with 3.2 GPABrenda Stern with 1.2 GPALynda Robison with 3.3 GPAJake Flynn with 1.8 GPA then the countProbation() method returns 2 and the program output is: Probation count: 2 Course.java import java.util.ArrayList; public class Course { private ArrayList<Student> roster; // Collection of Student…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…JAVA Create a new class HashSetManipulation with a main method. Create a new HashSet set and populate it with initial values "A", "B", and "C" using the add method. Print the size of the set using set.size(). Use a for loop to print the values in the set. Use the add method to add a new value "D" to the set and print the result of the set to show that the value has been added. Use the remove method to remove value "A" from the set and print the result of the set to show that the value has been removed. Use the contains method to check if the value "C" exists in the set and print the result.