import javax.swing.*; // Import Swing components for GUI import java.awt.*; // Import AWT for layout and graphics import java.sql.Connection; // Import for SQL connection import java.sql.DriverManager; // Import for managing SQL driver import java.sql.PreparedStatement; // Import for prepared SQL statements public class chapter3 extends JFrame { private static String username; // Static field to store the username private HomePage homePage; // Reference to the home page object private JPanel panel; // Main panel for the GUI private JTextArea questionLabel; // Text area for displaying questions private JRadioButton[] options; // Array of radio buttons for answer options private ButtonGroup group; // Group to manage radio button selection private JButton nextButton; // Button to go to the next question private JButton previousButton; // Button to go back to the previous question @Override public void setVisible(boolean b) { super.setVisible(b); // Call the superclass method to set visibility } // Array of questions for the quiz private String[] questions = { "What is the result of the expression boolean b = (5 > 3);?", "Which relational operator checks if two values are equal in Java?", "In an if-else statement, what does the else block execute?", "Which of the following statements is correct about the && operator?", "What output will be produced by the statement System.out.println((5 % 2 == 0) ? \"Even\" : \"Odd\");?", "Which statement is used to terminate the execution of a case in a switch block?", "When does a leap year occur?", "In Java, what is the purpose of the default keyword in a switch statement?", "Which operator can be used as a shorthand for a simple if-else statement?", "What is a debugger mainly used for in programming?" }; // 2D array of answer options for each question private String[][] optionsForQuestions = { {"A. true", "B. false", "C. null", "D. Syntax error"}, {"A. =", "B. !=", "C. ==", "D. <>"}, {"A. When the condition is true", "B. When the condition is false", "C. Only when there's a syntax error", "D. Always, regardless of the condition"}, {"A. It returns true if both conditions are true.", "B. It returns false if both conditions are true.", "C. It is used to check if one condition is true.", "D. It is used only with integers."}, {"A. Even", "B. Odd", "C. Error", "D. None"}, {"A. stop", "B. return", "C. exit", "D. break"}, {"A. Every year divisible by 4", "B. Every year divisible by 100", "C. Every year divisible by 4 but not by 100, or divisible by 400", "D. Every year divisible by 400"}, {"A. To set the initial value", "B. To match any case that is not specified", "C. To stop the switch execution", "D. To throw an exception"}, {"A. ||", "B. &&", "C. ?:","D. !"}, {"A. To compile code", "B. To find and fix errors", "C. To generate random values", "D. To design user interfaces"} }; private String[] correctAnswers = {"A", "C", "B", "A", "B", "D", "C", "B", "C", "B"}; // Array of correct answers private int currentQuestionIndex = 0; // Index of the current question private int score = 0; // User's score private String[] selectedAnswers = new String[10]; // Array to store user's selected answers // Constructor for the chapter3 class public chapter3(String username) { this.username = username; // Initialize username this.homePage = homePage; // This seems incorrect; it should be initialized properly if used setTitle("Java Quiz - Chapter 3"); // Set the window title setSize(800, 600); // Set the window size setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Close application on exit getContentPane().setBackground(new Color(50, 64, 113)); // Set background color panel = new JPanel(); // Create a new panel panel.setLayout(null); // Use absolute positioning for custom placements panel.setOpaque(false); // Make the panel transparent // Set up the question label questionLabel = new JTextArea(); questionLabel.setFont(new Font("Arial Rounded MT Bold", Font.PLAIN, 24)); // Set font style and size questionLabel.setForeground(Color.WHITE); // Set text color questionLabel.setOpaque(false); // Make it transparent questionLabel.setEditable(false); // Make it non-editable questionLabel.setLineWrap(true); // Enable line wrapping questionLabel.setWrapStyleWord(true); // Wrap at word boundaries questionLabel.setBounds(50, 50, 700, 100); // Set position and size panel.add(questionLabel); // Add to the panel options = new JRadioButton[4]; // Initialize the options array group = new ButtonGroup(); // Initialize the button group // Create radio buttons for answer options for (int i = 0; i < 4; i++) { options[i] = new JRadioButton(); // Create a new radio button options[i].setFont(new Font("Arial Rounded MT Bold", Font.PLAIN, 18)); // Set font options[i].setForeground(Color.WHITE); // Set text color options[i].setBackground(new Color(50, 64, 113)); // Set background color options[i].setBounds(50, 150 + i * 50, 700, 30); // Set position and size group.add(options[i]); // Add to the button group panel.add(options[i]); // Add to the panel } // Set up the Next button nextButton = new RoundedButton("Next"); nextButton.setBounds(350, 450, 150, 50); // Set position and size nextButton.addActionListener(e -> { // Add action listener for Next button storeSelectedAnswer(); // Store the selected answer if (currentQuestionIndex < questions.length - 1) { currentQuestionIndex++; // Move to the next question displayQuestion(); // Display the new question } else { calculateFinalScore(); // Calculate the final score storeProgressInFile(username, score); // Store progress in the database if (score >= 8) { //homePage.completeChapter(1, score); // Uncomment if HomePage method is defined new congrats3(username); // Open the congratulations screen } else { new GameOver3(username); // Open the game over screen } dispose(); // Close the current frame } }); panel.add(nextButton); // Add Next button to the panel // Set up the Previous button previousButton = new RoundedButton("Previous"); previousButton.setBounds(130, 450, 150, 50); // Set position and size previousButton.addActionListener(e -> { // Add action listener for Previous button storeSelectedAnswer(); // Store the selected answer if (currentQuestionIndex > 0) { currentQuestionIndex--; // Move to the previous question displayQuestion(); // Display the new question } }); panel.add(previousButton); // Add Previous button to the panel displayQuestion(); // Display the first question add(panel); // Add the main panel to the frame setVisible(true); // Make the frame visible } // Method to display the current question and options private void displayQuestion() { questionLabel.setText("Question " + (currentQuestionIndex + 1) + ": " + questions[currentQuestionIndex]); // Update the question text group.clearSelection(); // Clear previous selections for (int i = 0; i < 4; i++) { options[i].setText(optionsForQuestions[currentQuestionIndex][i]); // Set text for each option // Check if the answer was previously selected if (selectedAnswers[currentQuestionIndex] != null && selectedAnswers[currentQuestionIndex].equals(String.valueOf((char) ('A' + i)))) { options[i].setSelected(true); // Select the radio button } } } // Method to store the selected answer private void storeSelectedAnswer() { String selectedOption = ""; // Variable to hold the selected option for (int i = 0; i < 4; i++) { if (options[i].isSelected()) { selectedOption = String.valueOf((char) ('A' + i)); // Get the selected option break; // Exit the loop once found } } selectedAnswers[currentQuestionIndex] = selectedOption; // Store the selected answer } // Method to calculate the final score based on selected answers private void calculateFinalScore() { score = 0; // Reset score for (int i = 0; i < selectedAnswers.length; i++) { // Check if selected answer is correct if (selectedAnswers[i] != null && selectedAnswers[i].equals(correctAnswers[i])) { score++; // Increment score for correct answers } } } // Method to store progress in the database private void storeProgressInFile(String username, int score) { // Print the score and username for debugging System.out.println(score + " " + username); if (score >= 8) { // Check if the score is sufficient for completion String url = "jdbc:mysql://localhost:3306/java"; // Database URL String dbUser = "root"; // Database username String dbPassword = "#mnta$mn$ta07.inn05/22"; // Database password try { // Establish a connection to the database Connection connection = DriverManager.getConnection(url, dbUser, dbPassword); String sql = "update users set chapter3_score =? where username = ?"; // SQL query to update score PreparedStatement preparedStatement = connection.prepareStatement(sql); preparedStatement.setInt(1, score); // Set score parameter preparedStatement.setString(2, username); // Set username parameter int noodrecordsupdated = preparedStatement.executeUpdate(); // Execute the update System.out.println(noodrecordsupdated); // Print number of records updated } catch (Exception e) { e.printStackTrace(); // Print any exceptions for debugging } } } // Main method to launch the chapter3 quiz public static void main(String[] args) { new chapter3("testUser"); // Create an instance of chapter3 with a test username } // Inner class for creating rounded buttons static class RoundedButton extends JButton { public RoundedButton(String text) { super(text); // Call superclass constructor setBackground(hexToColor("#fbb748")); // Set button background color setForeground(Color.WHITE); // Set text color setBorderPainted(false); // Disable border painting setFocusPainted(false); // Disable focus painting setContentAreaFilled(false); // Disable content area filling setFont(new Font("Arial Rounded MT Bold", Font.PLAIN, 16)); // Set font setMargin(new Insets(0, 0, 0, 0)); // Set margin to zero setOpaque(false); // Make the button transparent setBorder(BorderFactory.createEmptyBorder()); // Set an empty border } // Custom paint method to create rounded corners protected void paintComponent(Graphics g) { g.setColor(getBackground()); // Set the background color g.fillRoundRect(0, 0, getWidth(), getHeight(), 30, 30); // Draw rounded rectangle super.paintComponent(g); // Call superclass paint method } } // Utility method to convert hex color string to Color object private static Color hexToColor(String hex) { return new Color( Integer.parseInt(hex.substring(1, 3), 16), // Red component Integer.parseInt(hex.substring(3, 5), 16), // Green component Integer.parseInt(hex.substring(5, 7), 16) // Blue component ); } }