代写MSc/ICY、代写Software留学生、代做Java语言、代写Java编程设计

日期：2019-11-13 05:12

c Manfred Kerber School of Computer Science

Alexandros Evangelidis University of Birmingham

Worksheet 4 5 November 2019

MSc/ICY Software Workshop

Assessed Worksheet: 3% of the module mark (5% for the 20cr version).

Submission Deadline is Tuesday, 19 Nov 2019, at 12:00 noon via Canvas.

Follow the submissions guidelines on Canvas. JavaDoc comments are mandatory.

All submissions must pass the tests provided on 12 Nov. For Exercises 1 – 3 submit own

tests.

Exercise 1: (Basic, MSc: 30%, ICY: 40%) Write a class Aircraft.java with the two field variables

passengerNumber and maxSpeed both of type int with a standard constructor, getter(s), setter(s), and

a toString method. Furthermore write a subclass Aeroplane.java with the additional field variable

fuelConsumption of type double. The class should contain a constructor, getter(s) and setter(s), and a

toString method. Make use of inheritance as far as possible.

Exercise 2: (Medium, 30%)

Let two interfaces for the two classes Subscription.java and SubscriptionPrime.java be given as

SubscriptionInterface.java and SubscriptionPrimeInterface.java. You find the interfaces in the

archive WS1-04-interfaces.zip on the Canvas page for the worksheet.

Subscription.java describes the subscription to a journal by the 3 field variables title, email, and

cost of types String, String, and int, respectively. The subclass SubscriptionPrime.java has the

additional field deliveryAddress of type String, indicating where hard copies of the journal should be

sent to. Make use of inheritance as far as possible.

Exercise 3: (Advanced, 30%) Assume a website for downloading music which has four classes, one

for representing a music title, MusicTitle.java, and three for user accounts. The class Account.java is

abstract with two subclasses AccountStandard.java for customers, and AccountAdministrator.java

for administrators. Each of the four classes is to implement a corresponding interface with the names

MusicTitleInterface.java, AccountInterface.java, AccountStandardInterface.java, and

AccountAdministratorInterface.java, respectively.

You can find the interfaces in a WS1-04-interfaces.zip file on the Canvas page for the worksheet.

You are supposed to write the four classes to add a (non-interactive) implementation of a very rudimentary

system.

The class Account has to have five field variables: name, salutation, email, password, and loggedIn of

types String, String, String, String, and boolean, respectively.

The subclass AccountStandard has the field variables balance, titlesBought, and failedLoginAttempts

of types int, ArrayList<MusicTitle>, and int, respectively. Furthermore, assume a fixed number of 3

maximal login attempts, stored in a public static final int MAXIMAL LOGIN ATTEMPTS variable.

The subclass AccountAdministrator has the field variable accounts of type ArrayList<Account>. An

administrator shall have the possibility to reset an account of a user by a method

public void resetAccount(Account account, String password). The method shall first reset the

password. For standard users (and only for standard users) it shall also reset the counter

failedLoginAttempts of failed login attempts to 0.

For the latter, you may make use of account instanceof AccountStandard to check whether the object

account is an instance of the subclass AccountStandard. If it is, it is still of type Account, but it can

be cast to the type AccountStandard using the standard type casting approach: (AccountStandard)

account.

Make use of inheritance as far as possible.

Exercise 4: (Executive Summary, MSc Students Only 10%) Write an executive summary on

the topic: “What is the rationale for the use of object oriented programming and which limitations are

overcome by the use of functions in Java?” The submission must be an accessible PDF document of two

pages (including title, author, date, and at least three references) using an 11pt font.