12. In the ArrayListProbs class complete the method public Book highestPricedBook (ArrayList list) that returns a reference to the Book object with the highest price, given a list of Books.
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- Computer Science You are required to develop a small chatting application where two or more friends can communicate each other through messages. Create a class Message which has Date d, and message (string). Provide getters/setters, constructors, toString. Create a class Friend having String name, String contact, email and ArrayList of Messages provide getters/setters, constructors, toString addMessage(Message m) method which will add new message to the list. Provide following options to the user using JFrame. Login which will help user login to the application. View Friends (Display List of All Friends) View Messages ( This should display all message of a Friend) Send message (This should ask for friend name and message match the friend name and write that message to the array list).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.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…
- Write the definitions of the member functions of the classes arrayListType and unorderedArrayListType that are not given in this chapter. The specific methods that need to be implemented are listed below. Implement the following methods in arrayListType.h: isEmpty isFull listSize maxListSize clearList Copy constructor Implement the following method in unorderedArrayListType.h insertAt Also, write a program (in main.cpp) to test your function.c# programMake a class called Employees, with attributes Name, Gender, Experience, Salary and ID.Make a delegate called EligiblePromo. This delegate takes an employees object as a parameter and returns a boolean value indication whether or not the employee should be promoted.Make a PromoteEmployee() method that takes an arraylist of Employees and delegate of type EligiblePromo as parametersNB: PromoteEmployee() methos loops through each Employees object and passes it to the delegate(25)• Class PassengerList has/should have the following members: -A list of valid PNR numbers pnrList as an instance variable. Constructor PassengerList () populates the list pnrList as given in the template code. -Method public PassengerInfo get PassengerInfo (String) should take a PNR number as argument, check if the PNR number is valid, and if yes, then return a valid Passenger Info object that has the name of the passenger. For ease of implementation, we assume that the valid PNR numbers are 1 to 3. An inner private class PassengerInfo Name of a passenger as an instance variable - This class implements interface IPassenger Info, which enables its object to be accessible from outside the class PassengerList. - Constructor PassengerInfo (String) assigns the name of the passenger to the instance variable of class Passenger Info whose PNR number is given. If the PNR number is 1, then the name should be passenger i, where the valid PNR numbers are for 1 ranging from 1 to 3.
- Create a player class and a Key class. A Player hasa name, HP, and a key. A character may only have one key at a time, a Key contains a String array that lists the names of all the placed the key can go. The key should have a use() function that takes in a string of what it is trying to be used on, the function will return true if it can be used on that door, and false if it cannot. The player can pick Up and Drop a key.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 methodpublic class Product { private String name; private double cost; public Product(String n, double c) { name=n; cost=c; } public String getName() { return name; On the left is code for a class called Product. Fill in the blanks in the code on the right in order to create three appropriate Product instances and add them to the cart ArrayList. Use the output of the code, shown below the code, to guide you. } public double getCost() { return cost; } public String toString() { return (name + "$" + cost); } public static void addProducts (ArrayList c) { add(new Product("Shampoo", 13.89)); add(new Product("Bread",4.99)); add(new Product("Cereal", 7.49)); } public static void main(String[] args) { ArrayList cart = new ArrayList(); ddProducts (cart); for (Product p : cart) { System.out.println(p); } } Output: Shampoo $13.89 Bread $4.99 Cereal $7.49
- 17. Phone Book ArrayList Write a class named PhoneBookEntry that has fields for a person's name and phone number. The class should have a constructor and appropriate accessor and mutator methods. Then write a program that creates at least five PhoneBookEntry objects and stores them in an ArrayList. Use a loop to display the contents of each object in the ArrayList.The class diagram below shows an Order class that "has a" Customer and zero or more Items. Order class should contain private Customer m_cust; private ArrayList<Item> m_items; public Order(Customer cus t) public void additem(Item i) public String toString() Item class should contain private String m_desc private int m_qty private double m_price public Item(String des c, double price, int qty) public String toString() Customer class should contain private String m_first; private String m_last; public Customer(String first, String last) public String toString() Please create the Order, Customer, and Item classes shown above. I have provided you with a read-only Main class that you can use to test your code. When you have completed the Order, Customer, and Item classes, running the Main program should produce the following output: Order for Smith, Tom Order Items: Greeting Card: 1 at 1.5 Baseball Glove: 1 at 54.0 Notebook: 3 at 2.5 public class Main{ public static void…Part #2: Write a class called Test equallists having main method to test the application. In main method create following: 1- Object of type ArrayList list1. 2- Add the following data to list1 (4 13 3- Object of type ArrayList list2. 4- Add the following data to list2 (4 2 1 12 5- Object of type ArrayList list3. 6- Test the equallists method to print the result. Example: list1: 4 13 1 list2: 4 2 1 list3: 1 0 8 12 1 9 0 9 0 2 0 OOL 1 0 (generated by the method) 0 150 10 18 19 01). 9205).