Online Quiz System Using java with complete source code

Online Quiz System using Java With Source Code Graphical User Interface [GUI]

Introduction:

The online Quiz Program is a Java-based desktop application designed to test users knowledge through a multiple-choice quiz. Developed using Java AWT and Swing, this program provides a simple yet engaging experience for learners, making it ideal for students, educators, and self-learners looking to assess their knowledge. The program presents 10 multiple-choice questions (MCQs), each with four answer options. After completing the quiz, users receive a detailed performance report, showing their selected answers, correct answers, and total score.

The system provides a range of features, including:

Simple GUI Interface – Developed using Java AWT and Swing for an interactive experience.
Multiple-Choice Format – Includes 10 Java-related questions with four answer choices each.
Detailed Report – Displays user-selected answers, correct answers, and the final score.
Standalone Application – Runs independently without requiring an internet connection.
Efficient Data Handling – Uses arrays and HashMap for storing questions and answers.

Required Modules:

The required modules in the QuizProgram.java file are:

java.awt.*; – Provides classes for building graphical user interfaces (GUI) using AWT.
java.awt.event.*; – Handles user interactions such as button clicks and other events.
javax.swing.*; – Used for creating GUI components like buttons, labels, and frames.
java.util.*; – Provides utility classes such as HashMap for storing user responses.

How to Run the Code:

Step 1: Compile the Java Program

Run the following command to compile the Java file:

javac QuizProgram.java

If there are no errors, this will generate a QuizProgram.class file.

Step 2: Run the Program

Run the compiled Java program using:

java QuizProgram

Step 3: Interact with the Quiz

The quiz window will open.
Select answers using radio buttons.
Click “Next” to proceed.
After the last question, click “Show Results” to see your score.

Code Explanation :

1. Importing Necessary Libraries

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

java.awt.* and javax.swing.*: Used for creating the graphical user interface (GUI).
java.awt.event.*: Handles user interactions (like button clicks).
java.util.*: Manages data structures like HashMap.

2. Declaring the `Quiz` Class

class Quiz extends JFrame implements ActionListener {

This class extends JFrame, meaning it creates a GUI window.
It implements ActionListener, allowing it to handle button clicks.

3. Declaring UI Components

    JPanel panel;
    JRadioButton choice1, choice2, choice3, choice4;
    ButtonGroup bg;
    JLabel lblmess;
    JButton btnext;

JRadioButton: Represents multiple-choice options.
ButtonGroup: Ensures only one option is selected at a time.
JLabel: Displays the question.
JButton: The “Next” button to proceed to the next question.

4. Storing Questions and Answers

    String[][] qpa;  // Question-Option Array
    String[][] qca;  // Correct Answer Array
    int qaid;  // Question ID
    HashMap<Integer, String> map;  // Stores user-selected answers

qpa: Stores questions with multiple-choice options.
qca: Stores correct answers.
qaid: Tracks the current question.
map: Stores user-selected answers.

5. Initializing the Quiz

    Quiz() {
        initializedata();
        setTitle("Quiz Program");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(400, 300);
        setLayout(new BorderLayout());

initializedata(): Loads questions and answers.
Sets up the window title, size, and layout.

6. Handling Button Clicks

    public void actionPerformed(ActionEvent e) {
        if (btnext.getText().equals("Next")) {
            if (qaid < qpa.length - 1) {
                qaid++;
                displayQuestion();
            } else {
                btnext.setText("Show Results");
            }
        } else if (btnext.getText().equals("Show Results")) {
            showResults();
        }
    }

When “Next” is clicked, it moves to the next question.
When all questions are answered, it shows results.

7. Displaying Results

    void showResults() {
        int correct = 0;
        for (int i = 0; i < qpa.length; i++) {
            if (map.get(i).equals(qca[i][1])) {
                correct++;
            }
        }
        JOptionPane.showMessageDialog(this, "Your Score: " + correct + "/" + qpa.length);
    }

Source Code:

				
					import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;


class Quiz extends JFrame implements ActionListener {
    JPanel panel;
    JRadioButton choice1;
    JRadioButton choice2;
    JRadioButton choice3;
    JRadioButton choice4;
    ButtonGroup bg;
    JLabel lblmess;
    JButton btnext;
    String[][] qpa;
    String[][] qca;
    int qaid;
    HashMap map;

    Quiz() {
        initializedata();
        setTitle("Quiz Program");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setSize(430, 350);
        setLocation(300, 100);
        setResizable(false);
        Container cont = getContentPane();
        cont.setLayout(null);
        cont.setBackground(Color.GRAY);
        bg = new ButtonGroup();
        choice1 = new JRadioButton("Choice1", true);
        choice2 = new JRadioButton("Choice2", false);
        choice3 = new JRadioButton("Choice3", false);
        choice4 = new JRadioButton("Choice4", false);
        bg.add(choice1);
        bg.add(choice2);
        bg.add(choice3);
        bg.add(choice4);
        lblmess = new JLabel("Choose a correct answer");
        lblmess.setForeground(Color.BLUE);
        lblmess.setFont(new Font("Arial", Font.BOLD, 11));
        btnext = new JButton("Next");
        btnext.setForeground(Color.BLUE);
        btnext.addActionListener(this);
        panel = new JPanel();
        panel.setBackground(Color.LIGHT_GRAY);
        panel.setLocation(10, 10);
        panel.setSize(400, 300);
        panel.setLayout(new GridLayout(6, 2));
        panel.add(lblmess);
        panel.add(choice1);
        panel.add(choice2);
        panel.add(choice3);
        panel.add(choice4);
        panel.add(btnext);
        cont.add(panel);
        setVisible(true);
        qaid = 0;
        readqa(qaid);
    }

    public void actionPerformed(ActionEvent e) {
        if (btnext.getText().equals("Next")) {
            if (qaid &gt;2";
        qpa[6][1] = "1";
        qpa[6][2] = "0";
        qpa[6][3] = "3";
        qpa[6][4] = "-3";

        qpa[7][0] = "How to do exit a loop?";
        qpa[7][1] = "Using exit";
        qpa[7][2] = "Using break";
        qpa[7][3] = "Using continue";
        qpa[7][4] = "Using terminate";

        qpa[8][0] = "What is the correct way to allocate one-dimensional array?";
        qpa[8][1] = "int[size] arr=new int[]";
        qpa[8][2] = "int arr[size]=new int[]";
        qpa[8][3] = "int[size] arr=new int[size]";
        qpa[8][4] = "int[] arr=new int[size]";

        qpa[9][0] = "What is the correct way to allocate two-dimensional array?";
        qpa[9][1] = "int[size][] arr=new int[][]";
        qpa[9][2] = "int arr=new int[rows][cols]";
        qpa[9][3] = "int arr[rows][]=new int[rows][cols]";
        qpa[9][4] = "int[][] arr=new int[rows][cols]";


        //qca stores pairs of question and its correct answer
        qca = new String[10][2];

        qca[0][0] = "How to run Java program on the command prompt?";
        qca[0][1] = "java JavaProgram";

        qca[1][0] = "What is the use of the println method?";
        qca[1][1] = "It is used to print text on the screen with the line break.";

        qca[2][0] = "How to read a character from the keyboard?";
        qca[2][1] = "char c=(char)System.in.read()";

        qca[3][0] = "Which one would be an int";
        qca[3][1] = "2";

        qca[4][0] = "How do you declare an integer variable x?";
        qca[4][1] = "int x";

        qca[5][0] = "How do you convert a string of number to a number?";
        qca[5][1] = "int num=Integer.parseInt(str_num)";

        qca[6][0] = "What is the value of x? int x=3&gt;&gt;2";
        qca[6][1] = "0";

        qca[7][0] = "How to do exit a loop?";
        qca[7][1] = "Using break";

        qca[8][0] = "What is the correct way to allocate one-dimensional array?";
        qca[8][1] = "int[] arr=new int[size]";

        qca[9][0] = "What is the correct way to allocate two-dimensional array?";
        qca[9][1] = "int[][] arr=new int[rows][cols]";


        //create a map object to store pairs of question and selected answer
        map = new HashMap();
    }

    public String getSelection() {
        String selectedChoice = null;
        Enumeration buttons = bg.getElements();
        while (buttons.hasMoreElements()) {
            JRadioButton temp = (JRadioButton) buttons.nextElement();
            if (temp.isSelected()) {
                selectedChoice = temp.getText();
            }
        }
        return (selectedChoice);
    }

    public void readqa(int qid) {
        lblmess.setText("  " + qpa[qid][0]);
        choice1.setText(qpa[qid][1]);
        choice2.setText(qpa[qid][2]);
        choice3.setText(qpa[qid][3]);
        choice4.setText(qpa[qid][4]);
        choice1.setSelected(true);
    }

    public void reset() {
        qaid = 0;
        map.clear();
        readqa(qaid);
        btnext.setText("Next");
    }

    public int calCorrectAnswer() {
        int qnum = 10;
        int count = 0;
        for (int qid = 0; qid &lt; qnum; qid++) {
            if (qca[qid][1].equals(map.get(qid))) {
                count++;
            }
        }
        return count;
    }

    public class Report extends JFrame {
        Report() {
            setTitle(&quot;Answers&quot;);
            setSize(850, 550);
            setBackground(Color.WHITE);
            addWindowListener(new WindowAdapter() {
                public void windowClosing(WindowEvent e) {
                    dispose();
                    reset();
                }
            });
            Draw d = new Draw();
            add(d);
            setVisible(true);
        }

	    class Draw extends Canvas {
	        public void paint(Graphics g) {
	            int qnum = 10;
	            int x = 10;
	            int y = 20;
	            for (int i = 0; i  400) {
	                    y = 20;
	                    x = 450;
	                }
	            }
                //show number of correct answers
                int numc = calCorrectAnswer();
                g.setColor(Color.BLUE);
                g.setFont(new Font("Arial", Font.BOLD, 14));
                g.drawString("Number of correct answers:" + numc, 300, 500);
	        }
        }
    }
}


public class QuizProgram {
    public static void main(String args[]) {
		new Quiz();
	}
}