JAVA Assignment Quiz Grader Write a program that administers and grades quizzes.

ID: 3669129 • Letter: J

Question

JAVA Assignment

Quiz Grader

Write a program that administers and grades quizzes. A quiz consists of questions. There are four types of questions: text questions, number questions, choice questions with a single answer, and choice questions with multiple answers. When grading a text question, ignore leading or trailing spaces and letter case. When grading a numeric question, accept a response that is approximately the same as the answer.

A quiz is specified in a text file. Each question starts with a letter indicating the question type (T, N, S, M), followed by a line containing the question text. The next line of a non-choice question contains the answer. Choice questions have a list of choices that is terminated by a blank line. Each choice starts with + (correct) or - (incorrect). Here is a sample .txt file:

Your program should read in a quiz file, prompt the user for responses to all questions, and grade the responses. Follow the design process that was described in this chapter.
Here is a sample program run:

Use the following class as your main class:

Explanation / Answer

Main.java

import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

public class Main{
 public static void main(String[] args) throws IOException {
 Quiz q = new Quiz();
 Scanner in = new Scanner(new FileReader("Quiz.txt"));
 q.read(in);
 in.close();
 in = new Scanner(System.in);
 ArrayList<Question> questions = q.getQuestions();
 ArrayList<String> answers = new ArrayList<String>();
 for (Question qu : questions) {
 System.out.println(qu.getText());
 String answer = in.nextLine();
 answers.add(answer);
 }
 boolean[] results = q.checkAnswers(answers);
 for (int i = 0; i < results.length; i++) {
 System.out.println();
 System.out.println(questions.get(i).getText());
 System.out.println("Correct answer: " + questions.get(i).getStringAnswer());
 System.out.println("Your answer: " + answers.get(i));
 System.out.print("Your answer was ");
 if (!results[i]) {
 System.out.print("not ");
 }
 System.out.println("correct.");
 }
 }
}

Quiz.java

import java.util.ArrayList;
import java.util.Scanner;

public class Quiz {
private ArrayList<Question> questions = new ArrayList<Question>();

/**
 * Parses the input text file and stores questions/answers/options into correct variables. 
 *
 * @param in A scanner input that reads from a file. 
 */
 public void read(Scanner in) {
 while (in.hasNext()) {
 String line = in.nextLine();
 if (line.equals("T")) {
 String txt = in.nextLine();
 String ans = in.nextLine();
 TextQuestion textQuestion = new TextQuestion(txt, ans);
 questions.add(textQuestion);
 } else if (line.equals("S") || line.equals("M")) {
 String txt = in.nextLine();
 MultiChoiceQuestion multiChoiceQuestion = new MultiChoiceQuestion(txt);
 String check = in.nextLine();
 while (!check.equals("")) {
 if (check.substring(0, 1).equalsIgnoreCase("+")) {
 multiChoiceQuestion.addOption(check.substring(1).trim(), true);
 System.out.println("Right: " + check.substring(1).trim());
 check = in.nextLine();
 } else if (check.substring(0, 1).equalsIgnoreCase("-")) {
 multiChoiceQuestion.addOption(check.substring(1).trim(), false);
 System.out.println("Wrong: " + check.substring(1).trim());
 check = in.nextLine();
 }
 }
 questions.add(multiChoiceQuestion);
 } else if (line.equals("N")) {
 String txt = in.nextLine();
 String answer = in.nextLine();
 float floatAnswer = Float.parseFloat(answer);
 answer = Util.cleanNumberString(answer);
 NumberQuestion numberQuestion = new NumberQuestion(txt, answer, floatAnswer);
 questions.add(numberQuestion);
 }
 }
 }

public ArrayList<Question> getQuestions() {
 return questions;
 }

/**
 * Checks users answers against the ArrayList of correct answers. */
 public boolean[] checkAnswers(ArrayList<String> answers) {
 boolean[] isCorrect = new boolean[questions.size()];
 for (int x = 0; x < answers.size(); x++) {
 Question currentQuestion = questions.get(x);
 if (currentQuestion instanceof TextQuestion || currentQuestion instanceof NumberQuestion) {
 if (currentQuestion.getStringAnswer().equalsIgnoreCase(answers.get(x).trim())) {
 isCorrect[x] = true;
 continue;
 } else {
 isCorrect[x] = false;
 continue;
 }
 } else if (currentQuestion instanceof MultiChoiceQuestion) {
 String sortedAnswer = Util.cleanAndSortAnswer(answers.get(x));
 if (currentQuestion.getStringAnswer().equalsIgnoreCase(sortedAnswer)) {
 isCorrect[x] = true;
 continue;
 } else {
 isCorrect[x] = false;
 }
 }
 }
 return isCorrect;
 }
}

Util.java
import java.util.Arrays;
public class Util {
 /**
 * Method to get a letter from an integer with 1 being associated with A, and 2 being associated with B etc. */
 public static String getLetterFromInt(int i) {
 return Character.toString((char) (i + 64));
 }

/**
 * Sorts a string in alphabetical order and cleans the string. */
 public static String cleanAndSortAnswer(String unsortedAnswer) {
 unsortedAnswer
 .replace(" ", "")
 .replace(".", "")
 .replace(",", "")
 .replace("-", "");
 unsortedAnswer.toUpperCase();
 char[] charArray = unsortedAnswer.toCharArray();
 Arrays.sort(charArray);
 return new String(charArray);
 }

    /**
     * Removes any additional characters, that could potentially cause problems, from a string number.*/
    public static String cleanNumberString(String numberString) {
        if (numberString.contains(",")) {
            numberString = numberString.replace(",", "");
        }
        if (numberString.contains(" ")) {
            numberString = numberString.replace(" ", "");
        }

return numberString;
}
}
MultiChoiceQuestion.java
import java.util.Arrays;

public class Util {
 /**
 * Method to get a letter from an integer with 1 being associated with A, and 2 being associated with B etc. */
 public static String getLetterFromInt(int i) {
 return Character.toString((char) (i + 64));
 }

    /**
     * Removes any additional characters, that could potentially cause problems, from a string number. */
    public static String cleanNumberString(String numberString) {
        if (numberString.contains(",")) {
            numberString = numberString.replace(",", "");
        }
        if (numberString.contains(" ")) {
            numberString = numberString.replace(" ", "");
        }

return numberString;
}
}

MultiChoiceQuestionOption.java

public class MultiChoiceQuestionOption {
private boolean isCorrect;
private String optionText;

    public MultiChoiceQuestionOption(String optionText, boolean isCorrect) {
        this.optionText = optionText;
        this.isCorrect = isCorrect;
    }

    public boolean isCorrectOption() {
        return isCorrect;
    }

    public String getOptionText() {
        return optionText;
    }
}

NumberQuestion.java

public class NumberQuestion extends Question {
protected float floatAnswer;

    public NumberQuestion(String txt, String stringAnswer, float floatAnswer) {
        this.text = txt;
        this.stringAnswer = stringAnswer;
        //this.floatAnswer = floatAnswer;
    }
}

Question.java

public class Question {
protected String text;
protected String stringAnswer;

    public String getText() {
        return text;
    }

    public String getStringAnswer() {
        return stringAnswer;
    }
}

TextQuestion.java
public class TextQuestion extends Question {
    public TextQuestion(String text, String answer) {
        this.text = text;
        this.stringAnswer = answer;
    }
}

Quiz.txt
T
Which Java keyword is used to define a subclass?
extends

S
What is the original name of the Java language?
- *7
- C--
+ Oak
- Gosling

M
Which of the following types are supertypes of Rectangle?
- PrintStream
+ Shape
+ RectangularShape
+ Object
- String

N
What is the square root of 2?
1.41

output

Wrong: *7
Wrong: C--
Right: Oak
Wrong: Gosling
Wrong: PrintStream
Right: Shape
Right: RectangularShape
Right: Object
Wrong: String
Which Java keyword is used to define a subclass?
extends
What is the original name of the Java language?
Option A: *7
Option B: C--
Option C: Oak
Option D: Gosling
C
Which of the following types are supertypes of Rectangle?
Option A: PrintStream
Option B: Shape
Option C: RectangularShape
Option D: Object
Option E: String
B
What is the square root of 2?
1

Which Java keyword is used to define a subclass?
Correct answer: extends
Your answer: extends
Your answer was correct.

What is the original name of the Java language?
Option A: *7
Option B: C--
Option C: Oak
Option D: Gosling
Correct answer: C
Your answer: C
Your answer was correct.

Which of the following types are supertypes of Rectangle?
Option A: PrintStream
Option B: Shape
Option C: RectangularShape
Option D: Object
Option E: String
Correct answer: BCD
Your answer: B
Your answer was not correct.

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JAVA Assignment Quiz Grader Write a program that administers and grades quizzes.

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