Quiz.java

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

    public class Quiz{
        private String quizName;
        private List<Question> questions;
        private int finalScore;
    
      
                    public Quiz(String quizName) {
                        if (quizName == null || quizName.isEmpty()) {
                            System.out.println("Quiz Name cannot be null or empty!");
                        } else {
                            this.quizName = quizName;
                            this.questions = new ArrayList<>();
                            this.finalScore = 0;
                        }
                    }
    
    
            public String getQuizName() {
                return quizName;
            }
        
            public List<Question> getQuestions() {
                return questions;
            }
        
            public int getFinalScore() {
                return finalScore;
            }
        
            public void addQuestion(Question question) {
                if (question == null) {
                    System.out.println("Question cannot be null!");
                } else {
                    questions.add(question);
                }
            }
        public void attemptQuiz(){
            Scanner sc = new Scanner(System.in);
            for(int i=0;i<questions.size();++i){ //Iterates over the list of Questions
                questions.get(i).display(); //Displays the question along with the list of choices
                int opt = sc.nextInt(); //Takes in the user input and stores it in integer variable `opt`
                if(opt<1 || opt>questions.get(i).getChoices().size()){ 
                    //checks if the choice provided by user does not lie in the range of the list of choices
                    System.out.println("Please choose a number between 1 and " + questions.get(i).getChoices().size());
                    // asks the user to choose a number between given range
                    i--; // the value of i is decremented so that the previous question comes again in the loop and is printed
                } else if (questions.get(i).checkAnswer(questions.get(i).getChoices().get(opt-1))){
                    //else if option lies within the range, then it is checked whether the provided answer is correct
                    // if provided answer is correct then the finalScore value is incremented by 1
                    finalScore++;
                }
            }
            sc.close(); //after all the questions are attempted Scanner class instance is closed.
        }
        
        public void revealAnswerKey(){
            for (int i = 0; i < questions.size(); i++)
            {
                System.out.println("Question no. " + (i+1) + " : " + questions.get(i).getQuestionText() +
                        "\nAnswer no. " + (i+1) + " : " + questions.get(i).getAnswer());
            }
        }
     
    
    }