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Java Question, ChoiceQuestion and QuestionDemo classes

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Add a method addText to the Question class, and provide a different implementation of ChoiceQuestion that calls addText rather than storing an array list of choices.

Here is a sample program run:

Who was the inventor of Java?
Your answer:
James Gosling
true
In which country was the inventor of Java born?
1: Australia
2: Canada
3: Denmark
4: United States
Your answer:
2
true

Use the following class as your main class:

import java.util.Scanner;

public class QuestionDemo
{
public static void main(String[] args)
{
Question[] quiz = new Question[2];

quiz[0] = new Question("Who was the inventor of Java?");
quiz[0].setAnswer("James Gosling");

ChoiceQuestion question = new ChoiceQuestion(
"In which country was the inventor of Java born?");
question.addChoice("Australia", false);
question.addChoice("Canada", true);
question.addChoice("Denmark", false);
question.addChoice("United States", false);
quiz[1] = question;

Scanner in = new Scanner(System.in);
for (Question q : quiz)
{
q.display();
System.out.println("Your answer: ");
String response = in.nextLine();
System.out.println(q.checkAnswer(response));
}
}
}

Complete the following classes in your solution:

/**
A question with multiple choices.
*/
public class ChoiceQuestion extends Question
{
// Add any needed instance variables, but don't store the choices
// The choices should be added to the text of the superclass

/**
Constructs a choice question with a given text and no choices.
@param questionText the text of this question
*/
public ChoiceQuestion(String questionText)
{
...
}

/**
Adds an answer choice to this question.
@param choice the choice to add
@param correct true if this is the correct choice, false otherwise
*/
public void addChoice(String choice, boolean correct)
{
...
}
}

/**
A question with a text and an answer.
*/
public class Question
{
private String text;
private String answer;

/**
Constructs a question with a given text and an empty answer.
@param questionText the text of this question
*/
public Question(String questionText)
{
text = questionText;
answer = "";
}

/**
Sets the answer for this question.
@param correctResponse the answer
*/
public void setAnswer(String correctResponse)
{
answer = correctResponse;
}

/**
Checks a given response for correctness.
@param response the response to check
@return true if the response was correct, false otherwise
*/
public boolean checkAnswer(String response)
{
return response.equals(answer);
}

/**
Add a line of text to the question text.
*/
public void addLine(String line)
{
...
}

/**
Displays this question.
*/
public void display()
{
System.out.println(text);
}
}

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Solution Summary

Reasonable comments are inserted to explain the inserted (new) code.

Solution Preview

Please find attached files: QuestionDemo.java, ChoiceQuestion.java and Question.java.

Content of ChoiceQuestion.java is pasted below.

/**
A question with multiple choices.
*/
public class ChoiceQuestion extends Question
{
// Indicates the number that should be associated with next choice.
int ...

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