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- Observer pattern The PhoneModel class stores a phone number as a list of digits, and the Keypad class has this method: public void simulateKeyPresses(int numKeyPresses)(0 that allows the user to enter digits one at a time then save each digit in the list. The Screen wants to respond to each key being entered. Make the model notify the observers whenever a new digit is entered for the phone number. The first observer prints the newest digit out to the screen The second observer prints "Now dialing 12345678901.." out to the screen (where the number is the number the model has). Only the Screen class can print to the screen The model must be decoupled from the Other classes.Library class: Fields: books as arraylist to store all the books available in the library B3 B1 B2 В4 B5 Constructor: Library() } : No parameterized constructor to create the books object Methods: 1. addBook(Book bookobj): to add a new book to the arraylist; send the book object as a parameter to this method. 2. searchBook(String name): search a book by a given name in the arraylist. if exits print bookX found; otherwise print not found!!! 3. RemoveBook(String name): to delete a book object from arraylist by a given name: Hint: you need to use iterator class and remove method. Book class: Fileds: bookld, bookname. Constructor: two parameterized constructor that accepts name a parameter Book(int ID, String name) ..... Methods: 1. Accessor method to return the name of the book 2. Mutator method to change the id of the book. Use this Main method: in your program: public static void main(String args[]) { Library lib=new Library(); lib.addBook(new Book("b1")); lib.addBook(new Book("b2"));…Java Programming Class Car Attributes (all private): vin: String (5 digits) make: String model: String year: int price: double Methods: Parameterized constructor for initializing a new Car instance Getters for all attributes toString method to display a Car's attributes Executable Class Create an array of at least ten Car objects. Be sure to use many with identical last years and different prices. Create an ArrayList from the array. Shuffle the ArrayList. Sort the ArrayList first by year and then by price. See page 790-791. Using the forEach method and a lambda expression, print all cars sorted as above. Create a LinkedList from the ArrayList. Create an iterator capable of cycling both forward and backward through the LinkedList. Iterate forward through the entire LinkedList but without generating any output. Then iterate backwards through the LinkedList to print the cars data.
- Task 4. Utility classes Implement a Menu-Driven program of ArrayList class using the above scenario and perform the following operations. Create an object of ArrayList class based on the scenario with explanations of the method Create a method that will allow inserting an element to ArrayList Class based on the scenario. The input field must be validated as Create a method to delete specific elements in the ArrayList with explanations of the methodplease complete this method, thanks/** * Adds an item into the set if it is not already inside. * @param item to be added inside the set. * @throws IllegalArgumentException if item is null. */public void add(T item) {}DiceSet Class in Python Write a class named DiceSet that contains a list of Die objects. Fields dice a list of Die objects Methods __init__(self, dice_faces) The constructor should instantiate the dice list to an empty list if no parameters are set. The constructor should take a list of integers. Add one die to the dice set for each integer with the number of faces equal to the integer. pop_die(self, value) Remove and return the first die with the given value from the list. add_die(self, die) Adds the given die (of class Die) to the dice list. roll(self) Roll all the die objects in the list of dice and return their sum. die_values(self) Return a list of the int values (last rolls) of the dice in the list. __str__(self) returns a string version of a dice set. Example: "{[d3] 1, [d6] 4, [d12] 5, [d4] 3}"
- Define a class called Book. This class should store attributes such as the title, ISBN number, author, edition, publisher, and year of publication. Provide get/set methods in this class to access these attributes. Define a class called Bookshelf, which contains the main method. This class should create a few book objects with distinct names and store them in an ArrayList. This class should then list the names of all books in the ArrayList. Enhance the program by providing a sort function, which will sort the books in ascending order of their year of publication. Create a few more Bookobjects with the same names but with different edition numbers, ISBNs, and years of publication. Add these new Book objects to the ArrayList, and display the book list sorted by book name; for duplicate books of the same name, sort the list by year of publication. (Hint: You will need to define a comparator class that takes two Book objects as parameters of the compareTo This method should do a two-step…class BinaryImage: def __init__(self): pass def compute_histogram(self, image): """Computes the histogram of the input image takes as input: image: a grey scale image returns a histogram as a list""" hist = [0]*256 return hist def find_otsu_threshold(self, hist): """analyses a histogram it to find the otsu's threshold assuming that the input hstogram is bimodal histogram takes as input hist: a bimodal histogram returns: an optimal threshold value (otsu's threshold)""" threshold = 0 return threshold def binarize(self, image): """Comptues the binary image of the the input image based on histogram analysis and thresholding take as input image: an grey scale image returns: a binary image""" bin_img = image.copy() return…Computer Science create a method +addToList(o:E):void that adds the object (o) to the ArrayList referenced by the instance variable list. create a method +removeFromBackOfList():E that removes the object at the back of the ArrayList and returns it.
- Java Program for a Christmas List - NO GUI ** Please include ULM and comments in the code. ** Minimum requirements are: At least 1 loop An Array or ArrayList At least 3 Java classes Use methods I am trying to make it so that the program will have a menu to choose from that includes: Add Recipient Name Add Gift Idea (prompts for the participant to add the gift idea to from the list of those already entered) Mark Gift as Purchased (allows the user to select the recipient from the list, then select a gift idea from the list entered for that recipient, and mark it as "Done".) Mark Gift as Received (allows the user to select the recipient from the list, then select a gift idea from the list entered for that recipient, and mark it as "Done".) Mark Gift as Wrapped (allows the user to select the recipient from the list, then select a gift idea from the list entered for that recipient, and mark it as "Done".) Delete Gift Idea (prompts for the participant and then the idea selection to…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 . ExitCreate a MagicalPotionShop class, this class needs a field called potions. The potions field should be an ArrayList of the type Potion. Create a MagicalPotion class, this class needs two fields one called name, the other called effect. Both of the fields should be Strings.