Homework 2 - ArrayList

Homework 2
Designing with Classes; Using ArrayList

Due: Tuesday, March 31 at 5pm

Outcomes

After successfully completing this assignment, you will...

be able to develop a Java program that utilizes multiple classes
be able to use ArrayList to store and manipulate a collection of objects
know how to define overloaded methods
understand when to use private methods
know how to define and use an enumerated type

Before Starting

Read Chapters 2, 3, and 7 in Horstmann.

The Assignment

Write a program that administers an online quiz. A quiz consists of questions. Each question has a (correct) answer and an associated level of difficulty (easy or hard). When the quiz is administered, the program can choose to display all the questions in the quiz, or only those questions at a particular level of difficulty. After the student (user) takes the quiz, the score is reported as a percentage.

NOTE 1: Use the class names and method signatures exactly as given in the following descriptions. We'll be running your code with our own main program that will rely on the given names and signatures. Put each class in its own file. All classes should be part of a package named quizPackage.

NOTE 2: Document all classes and methods with javadoc-style comments.

Data

Create a class called Question. A question consists of a question (naturally!), an associated correct answer, and a level of difficulty. The difficulty level should be implemented as an enumerated type (called Difficulty), where the values of the type are EASY and HARD.
Create a class called Quiz. A quiz consists of an ArrayList<Question>. You may find you need to add other private fields to the Quiz class as you develop methods for quizzes.

Methods

Write a constructor for the Question class that allows a Question object to be created with a question, an answer, and a difficulty level.
Override the definition of the toString() method in the Question class. You may define additional methods in the Question class as needed.
Write a constructor for the Quiz class that doesn't take any arguments. The constructor creates a new ArrayList to hold the questions in the quiz.
Write a void method called add() in the Quiz class. The method adds the given question to the ArrayList of questions in the quiz.
Write a void method giveQuiz() in the Quiz class. There should be two versions of this method. One version, which doesn't take any parameters, cycles through all the questions in the quiz, asking each question, accepting the user's response, and reporting whether or not the answer was correct. After all questions have been asked and answered, the method calculates and displays the user's score as a percentage. (See Sample Output, below). The second (overloaded) version of the giveQuiz() method takes a single parameter of type Difficulty, and should work the same as the first version, except that only those questions with the given difficulty level are asked.
Create a class called QuizTime that consists of a main method that populates a Quiz with Questions, then administers the quiz.

Sample Output

A run of the program that shows all questions in the quiz...

<...preparing quiz...>

Type A to see All questions in the quiz
Type E to see only the Easy questions
Type H to see only the Hard questions
Enter your choice (A, E, H) now:  A

An interface can contain method definitions (true/false)
true
No, the answer is false

What keyword is used in Java to indicate that a field is accessible only to objects in its class?
private
Correct!

If a field is private in a superclass, can it be declared public in a subclass (yes/no)
yes
No, the answer is no

Your score is    33.33%

A run of the program that shows only the easy questions in the quiz...

<...preparing quiz...>

Type A to see All questions in the quiz
Type E to see only the Easy questions
Type H to see only the Hard questions
Enter your choice (A, E, H) now:  E

An interface can contain method definitions (true/false)
false
Correct!

What keyword is used in Java to indicate that a field is accessible by name only to objects in the same class?
public
No, the answer is private

Your score is    50.00%

Deliverables

Export your Eclipse project to a zip file and submit the zip file via web-based turnin. To export a project, go to File | Export… and choose Archive File from the General folder. Check off the entire project in the top left window and make sure the format is .zip and not .tar. Finally, give the archive file a name and click finish.

The name of the turnin project is Homework 2.

Programs submitted after 5pm on March 31 will be tagged as late, and will be subject to the late homework policy.

Grading

Here is the grade sheet that will be used when grading this assignment (please note that this is the last time the grade sheet will be published in advance). Your program must compile without errors in order to receive any credit. It is suggested that before you submit your program, you should compile it one more time to make sure that it compiles correctly. When grading your program we'll be running our own set of test cases against your classes. Make sure you name your classes and methods exactly as specified.

Homework 2 Designing with Classes; Using ArrayList