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M4ProjectPhase1.docx

Lab6.pdf

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M4ProjectPhase1.docx

You are asked to create a program that will be used to create quizzes and test users based on these quizzes.

1. Prompt a secret word and proceed if it matches a secret code.

2. Your program should have two modules: quiz creation mode and test mode. User will be prompted in the beginning to choose from these two modes. For example:

“Welcome to the quiz master: please enter 1 if you want to manage questions, 2 if you want to take a quiz, 3 if you want to exit”

If wrong number/option entered show the message and ask again.

3. If user chose to enter quiz creation module

a. Application then asks user 1) to add new question, 2) to delete existing question, 3) to list all available questions 4) to go to the main module selection menu.

We do not need to have edit capability, this can be done by deleting and adding it back.

b. If user wants to add a new question.

i. Prompt the following information

1. Question Code.

2. Question text.

3. Number of possible answers

a. Loop as many times as there should be answers and prompt to enter answer text

4. Correct answer

ii. IN PHASE 1 NO NEED TO SAVE THIS

iii. Once a new question entered show the “manage questions“ menu

c. If user wants to delete a question, prompt the user to enter Question Code.

i. Show the message that question is deleted

d. If user wants to list all questions then

i. Show the message “Printing questions”

ii. show “manage questions“ menu

4. If user choses to enter quiz taking module

a. Prompt to enter test taker information

i. First Name

ii. Last Name

iii. Number of questions

b. Show message “Starting quiz”

c. Show main menu

Here is the test output

Welcome to the quiz master.

Please enter the secret code or enter -1 to exit: Blabla

Secret word is incorrect

Please enter the secret code or enter -1 to exit: Blablabla

Secret word is correct

Please choose from the following options

1) Manage questions

2) Take a quiz

3) Exit

You have selected option 4, which is invalid, please select again

1) Manage questions

2) Take a quiz

3) Exit

You have selected option 1 - manage questions

Please choose from the following options

1) Add new question

2) Delete Existing question

3) Print all questions

4) Main menu

You have selected option 5, which is invalid, please select again

1) Add new question

2) Delete Existing question

3) Print all questions

4) Main menu

You have selected option 1 - Add new question

Please enter question code:

Question code cannot be empty

Please enter question code: Q0001

Please enter question text:

Question text cannot be empty

Please enter question text: What 1 + 1?

Please enter number of possible answers:

Number of possible answers cannot be empty

Please enter number of possible answers: 4

Please enter answer 1 to the Q0001:

Answer cannot be empty

Please enter answer 1 to the Q0001: 2

Please enter answer 2 to the Q0001: 3

Please enter answer 3 to the Q0001: 4

Please enter answer 4 to the Q0001: n/a

Please enter the number corresponding to a correct answer:

Number corresponding to a correct answer cannot be empty

Please enter the number corresponding to a correct answer: 5

You have selected 5, which is invalid number corresponding to a correct answer

Please enter the number corresponding to a correct answer: 1

Question Q0001 is saved! // just a message no need to save it anywhere

Please choose from the following options

1) Add new question

2) Delete Existing question

3) Print all questions

4) Main menu

You have selected option 1 - Add new question

Please enter question code: Q0002

Please enter question text: What 1 + 2?

Please enter number of possible answers: 4

Please enter answer 1 to the Q0002: 2

Please enter answer 2 to the Q0002: 3

Please enter answer 3 to the Q0002: 4

Please enter answer 4 to the Q0002: 5

Please enter the number corresponding to a correct answer: 2

Question Q0002 is saved!

Please choose from the following options

1) Add new question

2) Delete Existing question

3) Print all questions

4) Main menu

You have selected option 2 - Delete Existing question

Please enter the code for the question you want to delete:

The code for the question you want to delete cannot be empty

Please enter the code for the question you want to delete: Q0003

Question Q0003 is deleted! // nothing needs to be deleted just a message at this moment

Please choose from the following options

1) Add new question

2) Delete Existing question

3) Print all questions

4) Main menu

You have selected option 3 - Print all questions

// no need to print anything yet

Please choose from the following options

1) Add new question

2) Delete Existing question

3) Print all questions

4) Main menu

You have selected option 4 - Main menu

Please choose from the following options

1) Manage questions

2) Take a quiz

3) Exit

You have selected option 2 - Take a quiz

Please enter your first name:

First name should not be empty

Please enter your first name:Faig

Please enter your last name:

Last name should not be empty

Please enter your last name:Garayev

Please enter number of questions:

Number of questions should not be empty

Please enter number of questions: 2

Starting quiz

// no need to do anything here yet

Quiz is now complete.

Here are the results

Faig Garayev

// no need to do anything here yet

Please choose from the following options

1) Manage questions

2) Take a quiz

3) Exit

Bye!!!

Lab6.pdf

Chapter 6 Lab

Classes

Lab Objectives

 Be able to declare a new class

 Be able to write a constructor

 Be able to write instance methods that return a value

 Be able to instantiate an object

 Be able to use calls to instance methods to access a change the state of an object

Introduction

Everyone is familiar with a television. It is the object we are going to create in this lab.

First we need a blueprint. All manufacturers have the same basic elements in the

televisions they produce as well as many options. We are going to work with a few basic

elements that are common to all televisions. Think about a television in general. It has a

brand name (i.e. it is made by a specific manufacturer). The television screen has a

specific size. It has some basic controls. There is a control to turn the power on and off.

There is a control to change the channel. There is also a control for the volume. At any

point in time, the television’s state can be described by how these controls are set.

We will write the Television class. Each object that is created from the

Television class must be able to hold information about that instance of a

Television in fields. So a Television object will have the following attributes:

 manufacturer. The manufacturer attribute will hold the brand name. This

cannot change once the television is created, so will be a named constant.

 screenSize. The screenSize attribute will hold the size of the television

screen.

This cannot change once the television has been created so will be a named

constant.

 powerOn. The powerOn attribute will hold the value true if the power is on

and false if the power is off.

 channel. The channel attribute will hold the value of the station that the

television is showing.

 volume. The volume attribute will hold a number value representing the

loudness (0 being no sound).

These attributes become fields in our class.

The Television object will also be able to control the state of its attributes. These

controls become methods in our class.

 setChannel. The setChannel method will store the desired station in the

channel field.

 power. The power method will toggle the power between on and off, changing

the value stored in the powerOn field from true to false or from false to

true.

 increaseVolume. The increaseVolume method will increase the value

stored in the volume field by 1.

 decreaseVolume. The decreaseVolume method will decrease the value

stored in the volume field by 1.

 getChannel. The getChannel method will return the value stored in the

channel field.

 getVolume. The getVolume method will return the value stored in the

volume field.

 getManufacturer. The getManufacturer method will return the

constant value stored in the MANUFACTURER field.

 getScreenSize. The getScreenSize method will return the constant

value stored in the SCREEN_SIZE field.

We will also need a constructor method that will be used to create an instance of a

Television.

These ideas can be brought together to form a UML (Unified Modeling Language)

diagram for this class, as shown below.

Television

-MANUFACTURER: String

-SCREEN_SIZE: int

-powerOn: boolean

-channel: int

-volume: int

+Television(brand: String, size: int):

+setChannel (station: int): void

+power( ): void

+increaseVolume( ): void

+decreaseVolume( ): void

+getChannel( ): int

+getVolume( ): int

+getManufacturer( ): String

+getScreenSize( ): int

Data type returned

Class Name

Attributes or fields

Methods

+ public

- private

Task #1 Creating a New Class

1. In a new file, create a class definition called Television.

2. Put a program header (comments or documentation) at the top of the file // The purpose of this class is to model a television

// Your name and today’s date

3. Declare the 2 constant fields listed in the UML diagram.

4. Declare the 3 remaining fields listed in the UML diagram.

5. Write a comment for each field indicating what it represents.

6. Save this file as Television.java.

7. Compile and debug. Do not run.

Task #2 Writing a Constructor

1. Create a constructor definition that has two parameters, a manufacturer’s brand

and a screen size. These parameters will bring in information.

2. Inside the constructor, assign the values taken in from the parameters to the

corresponding fields.

3. Initialize the powerOn field to false (power is off), the volume to 20, and the

channel to 2.

4. Write comments describing the purpose of the constructor above the method

header.

5. Compile and debug. Do not run.

Task #3 Methods

1. Define accessor methods called getVolume, getChannel,

getManufacturer, and getScreenSize that return the value of the

corresponding field.

2. Define a mutator method called setChannel that accepts a value to be stored in

the channel field.

3. Define a mutator method called power that changes the state from true to

false or from false to true. This can be accomplished by using the NOT

operator (!). If the boolean variable powerOn is true, then !powerOn is

false and vice versa.

Use the assignment statement powerOn = !powerOn;

to change the state of powerOn and then store it back into powerOn (remember

assignment statements evaluate the right hand side first, then assign the result to

the left hand side variable.

4. Define two mutator methods to change the volume. One method should be

called increaseVolume and will increase the volume by 1. The other method

should be called decreaseVolume and will decrease the volume by 1.

5. Write javadoc comments above each method header.

6. Compile and debug. Do not run.

Task #4 Running the Application

1. You can only execute (run) a program that has a main method, so there is a driver program that is already written to test out your Television class. Copy the file TelevisionDemo.java (see Code Listing 3.1) from the Student Files or

as directed by your instructor. Make sure it is in the same directory

as Television.java.

2. Compile and run TelevisionDemo and follow the prompts.

3. If your output matches the output below, Television.java is complete and correct. You will not need to modify it further for this lab.

OUTPUT (boldface is user input) A 55 inch Toshiba has been turned on.

What channel do you want? 56

Channel: 56 Volume: 21

Too loud! Lowering the volume.

Channel: 56 Volume: 15

Task #5 Creating another instance of a Television

1. Edit the TelevisionDemo.java file.

2. Declare another Television object called portable.

3. Instantiate portable to be a Sharp 19 inch television.

4. Use a call to the power method to turn the power on.

5. Use calls to the accessor methods to print what television was turned on.

6. Use calls to the mutator methods to change the channel to the user’s preference

and decrease the volume by two.

7. Use calls to the accessor methods to print the changed state of the portable.

8. Compile and debug this class.

9. Run TelevisionDemo again.

10. The output for Task #5 will appear after the output from above, since we added

onto the bottom of the program. The output for Task #5 is shown below.

OUTPUT (boldface is user input) A 19 inch Sharp has been turned on.

What channel do you want? 7

Channel: 7 Volume: 18

Code Listing 6.1 (TelevisionDemo.java)

import java.util.Scanner; // Needed for the Scanner class

/**

This class demonstrates the Television class.

public class TelevisionDemo

{

public static void main(String[] args)

{

// Create a Scanner object to read from the keyboard

Scanner keyboard = new Scanner (System.in);

// Declare variables

int station; // The user's channel choice

// Declare and instantiate a television object

Television bigScreen = new Television("Toshiba", 55);

// Turn the power on

bigScreen.power();

// Display the state of the television

System.out.println("A " +

bigScreen.getScreenSize() +

" inch " +

bigScreen.getManufacturer() +

" has been turned on.");

// Prompt the user for input and store into station

System.out.print("What channel do you want? ");

station = keyboard.nextInt();

// Change the channel on the television

bigScreen.setChannel(station);

// Increase the volume of the television

bigScreen.increaseVolume();

// Display the the current channel and

// volume of the television

System.out.println("Channel: " +

bigScreen.getChannel() +

" Volume: " +

bigScreen.getVolume());

System.out.println("Too loud! Lowering the volume.");

// Decrease the volume of the television

bigScreen.decreaseVolume();

// Display the the current channel and

// volume of the television

System.out.println("Channel: " +

bigScreen.getChannel() +

" Volume: " +

bigScreen.getVolume());

System.out.println(); // For a blank line

// HERE IS WHERE YOU DO TASK #5

}

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