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What should I add to print all the questions I have passed in the driver class?

Stack Overflow Asked by Suvab on December 12, 2020

These are my quiz and question class.

class Question{
    String question, answer;
    Question()
    {
        question = null;
        answer = null;
    }
    
    public Question(String question, String answer)
    {
        this.question = question;
        this.answer = answer;
    }
    
    public String toString(){
        return question;
    }
}

class Quiz extends Question{
    String name;
    
    Quiz(String name)
    {
        super();
        this.name = name;
    }

    public void addQuestion(Question q)
    {
        answer = q.answer;
        question = q.question;
    }
    
    public String toString(){
        return name+"nn" + question;
    }
}

And this is my driver class.

public class QuizSample{
    public static void main(String[] args){
        Quiz sample = new Quiz("Sample 1903 Quiz");
        
        sample.addQuestion(new Question("Who is known as the father of Java?", "James Gosling"));
        sample.addQuestion(new Question("Write a statement that assigns the length of a string s to int i", "i = s.length();"));
        sample.addQuestion(new Question("True or false: assigning an int to double is an example of a widening conversion", "true"));
        
        System.out.println(sample);
    }
}

This is the output:

Sample 1903 Quiz
True or false: assigning an int to double is an example of a widening conversion

But I want to print all the questions that I have passed.
Please help guys.

2 Answers

Your Quiz class can have a List to store all the questions,

like

List<Questions> lstQuestions = new ArrayList<Questions>();

and can be used in addQuestion method to add all the questions,

 public void addQuestion(Question q)
    {
        lstQuestions.add(q);
    }

and the main method can look like below,

public static void main(String[] args) {
        
        Scanner console = new Scanner(System.in);
        System.out.println("Welcome to my Quiz");
        
        for(Question quest : lstQuestion){
            System.out.println(quest);
            String ans = console.next();
            if(quest.getAnswer().equals(ans.trim())){
                System.out.println("right answer");
            }else{
                System.out.println("wrong answer");
            }
            
        }
        console.close();

    }

Answered by Prabhu on December 12, 2020

Class Quiz does not need to extend Question but rather to have a collection of questions (list or set).

Also, toString method needs to be updated to pretty print questions.

import java.util.*;
import java.util.stream.*;

class Quiz {
    String name;
    List<Question> questions = new ArrayList<>();
    
    Quiz(String name) {
        this.name = name;
    }

    public void addQuestion(Question q) {
        questions.add(q);
    }
    
    public String toString() {
        return name+"nn" + questions.stream()
                                      .map(Question::toString)
                                      .collect(Collectors.joining("n"));
    }
}

Answered by Alex Rudenko on December 12, 2020

Add your own answers!

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