c Manfred Kerber School of Computer ScienceAlexandros Evangelidis University of BirminghamWorksheet 8 Wednesday 21 November 2018MSc/ICY Software WorkshopAssessed Worksheet: 2% of the module mark.Submission Deadline is Thursday, 6 December 2018, at 2pm via Canvas.5% late submission penalty within the first 24 hours. No submission after 24 hours. Followthe submissions guidelines on Canvas. JavaDoc comments are mandatory. This worksheet willbe vivaed. No public tests will be provided, but you should still write your own JUnit tests.Exercise 1: (Basic, 30%) In the lecture (see the Canvas pages for Week 7) we have seen in a packagecompany an abstract class Employee with two subclasses HourlyEmployee and MonthlyEmployee. Adaptthese classes (and the interface Payable) so that the salary is of type double. Write a class Company withfield variable ArrayList employees with the usual getter and setter. Furthermore write inthe Company class a method public void increaseSalaries(double rate) which increases the salariesof all employees (whether paid on an hourly rate or with a fixed monthly salary) by the fixed rate. (Note,it makes sense to have corresponding increaseSalary methods – abstract or not – in the three classesdealing with employees.)For instance, with a pay increase of 0.02, somebody earning ￡10 per hour would then earn ￡10.20 perhour and somebody earning ￡1800 a month would then earn ￡1836 per month. That is, the methodincreaseSalaries should go over the whole ArrayList of all employees and increase all their salaries.Exercise 2: (Medium, 30%)(a) Implement a shopping cart. The customer can add products to the shopping cart and can inspectthe current state by printing it. The two classes, Product and ShoppingCart should reside in thepackage shop.The class Product should have the three field variables private String name, private doubleprice, and private int quantity with a standard constructor and standard getters. The fieldprice stores the price for a single product. The class should also contain a method public doublegetTotalPrice(), which computes the total price by multiplying the single price and the quantity.The class ShoppingCart has to contain a constructor public ShoppingCart(), a toString methodand a method public void add(Product p) to add a product to the shopping cart. Note thatproducts with the same name and price should not be added multiple times to the ArrayList, butthat their quantity is to be adjusted.For instance, a shopping cart containing the three products Product(Milk (1l), 1.12, 2),Product(Bread, 0.78, 2), and Product(Apples, 0.49, 4) should be printed as:2 * GBP 1.12 Milk (1l) = GBP 2.242 * GBP 0.78 Bread = GBP 1.564 * GBP 0.49 Apples = GBP 1.96---------------TOTAL GBP 5.76Note that prices should be rounded and displayed to exactly two digits after the decimal point.(b) Introduce multibuy discounts using a class public class MultiBuyProduct extends Productwith constructor public MultiBuyProduct(String name, double price, int quantity, intminDiscountedQuantity, int discountPercent) and method public double getTotalPrice().new MultiBuyProduct(Tomato, 0.5, 20, 10, 3) means that you buy 20 tomatoes at a priceof ￡0.50 and since you buy at least 10 you get a discount of 3%. MultiBuyProduct should reusefunctionality from its superclass wherever possible.For instance, a shopping cart created by adding the代做MSc/ICY作业、代写Java课程设计作业、代写Software作业、代做Java程序设计作业 代做SPSS|帮做 products Product(Milk (1pt), 0.79, 9),MultiBuyProduct(Tomato, 0.5, 20, 10, 3), Product(Tomato, 0.53, 5), and Product(Milk(1pt), 0.79, 4) should be printed as:13 * GBP 0.79 Milk (1pt) = GBP 10.2720 * GBP 0.50 Tomato = GBP 9.70(Multibuy Discount: GBP 0.30)5 * GBP 0.53 Tomato = GBP 2.65---------------TOTAL GBP 22.62Exercise 3: (Advanced, 30%) For this exercise you may make use of the Date class from the lablecture of Week 4. Write a program that allows users to book a number of rooms. Concretely, it shouldbe possible to book a room by a method public boolean book(String room, Date date, int hour,String purpose) where the room is taken from a fixed number of rooms such as String[] rooms ={R217, R222, R225, R245}, date is a date such as Date nov22 = new Date(22, November,2018), hour is the hour of the day for which the room is needed such as 14 to book the room from 14:00to 15:00, and purpose describes what the room is needed for. It should be possible to construct objectsby:RoomBooking bookings2018 = new RoomBooking(2018, rooms).The method book returns true if the room is available, false else. Bookings can be made for hoursstarting at 9:00, 10:00, . . ., 17:00.Write also a method public void cancel(String room, Date date, int hour) that deletes a bookingif it exists, so that the room is again available for further bookings. It should do nothing if the bookingdoes not exist.For instance, it should be possible to make bookings such as:bookings2018.book(R222, nov22, 12, Tutor meeting);bookings2018.book(R222, nov22, 12, Java meeting); //no booking since room booked alreadybookings2018.book(R222, nov22, 13, Interviews);bookings2018.book(R245, nov22, 16, Project meeting);bookings2018.book(R225, nov22, 14, Top-up tutorial);Write also a method public String displayDay(Date date) so that bookings2018.displayDay(nov22)produces a String such as:22 November 2018| R217 | R222 | R225 | R245 |------+--------------------+--------------------+--------------------+--------------------+9:00| | | | |------+--------------------+--------------------+--------------------+--------------------+10:00| | | | |------+--------------------+--------------------+--------------------+--------------------+11:00| | | | |------+--------------------+--------------------+--------------------+--------------------+12:00| | Tutor meeting | | |------+--------------------+--------------------+--------------------+--------------------+13:00| | Interviews | | |------+--------------------+--------------------+--------------------+--------------------+14:00| | | Top-up tutorial | |------+--------------------+--------------------+--------------------+--------------------+15:00| | | | |------+--------------------+--------------------+--------------------+--------------------+16:00| | | | Project meeting |------+--------------------+--------------------+--------------------+--------------------+17:00| | | | |------+--------------------+--------------------+--------------------+--------------------+Exercise 4: (Debugging, 10%) In the folder Ex4 on Canvas you find a class PGMImage that containsa method public void rotate (String filename) that should rotate a PGMImage by 90?clockwise andwrite it to a file filename. However, tests with images show that the images are not correctly rotated.What is the problem? Fix it.转自：http://ass.3daixie.com/2018112882668388.html
