Physics Whiz Quiz!--------------------------------------------------------------------------Please select a quiz category:1. Kinematics2. Dynamics3. Energy & Momentum4. Waves & Optics5. Electricity & Magnetism6. ExitEnter your choice (1-6): 5Select the difficulty level:1. Easy2. Medium3. Hard4. I don't care, just give me the questions!Enter your choice (1-4): 4How many questions would you like to answer?Enter your choice (1-4): 3[Question 1]The unit of electric potential difference is:1. Ampere (A)2. Ohm (Ω)3. Volt (V)4. Watt (W)Enter your choice (1-4): 3Correct![Question 2]Ohm's Law states that the current (I) is directly proportional to:1. Resistance2. Voltage3. Power4. ChargeEnter your choice (1-4): 1Incorrect. The correct answer was: 2.[Question 3]A circuit has a resistance of 10 Ω and a current of 2 A. What is the voltage?1. 5 V2. 20 V3. 0.2 V4. 200 VEnter your choice (1-4): 2Correct!Quiz finished!--------------------------------------------------------------------------Your final score: 2 out of 3Percentage: 66.67%Physics Whiz Quiz!--------------------------------------------------------------------------Please select a quiz category:1. Kinematics2. Dynamics3. Energy & Momentum4. Waves & Optics5. Electricity & Magnetism6. ExitEnter your choice (1-6): 6Goodbye!Process finished with exit code 0
Code
import java.util.ArrayList; import java.util.Collections; import java.util.List; import java.util.Scanner; public class ISP { // Constants for difficulty levels private static final int EASY = 1; private static final int MEDIUM = 2; private static final int HARD = 3; private static final int ALL = 4; // Tracks the current score and question index private static int currentScore = 0; private static int questionIndex = 0; public static void main(String[] args) { Scanner scanner = new Scanner(System.in); do { displayMenu(); // Display the main menu to the user int choice = getUserIntInput(1, 6, scanner); // Get user input for the category or exit switch (choice) { case 1: case 2: case 3: case 4: case 5: startQuiz(choice, scanner); // Start the quiz based on the user's choice of category break; case 6: System.out.println("Goodbye!"); // Exit message System.exit(0); // Exit the program break; default: System.out.println("Invalid choice. Please try again."); // Handle invalid input } } while (true); } /** * Displays the main menu for quiz category selection. */ private static void displayMenu() { System.out.println("\nPhysics Whiz Quiz!"); System.out.println("--------------------------------------------------------------------------"); System.out.println("Please select a quiz category:"); System.out.println("1. Kinematics"); System.out.println("2. Dynamics"); System.out.println("3. Energy & Momentum"); System.out.println("4. Waves & Optics"); System.out.println("5. Electricity & Magnetism"); System.out.println("6. Exit"); } /** * Displays the difficulty level menu. */ private static void displayDifficultyMenu() { System.out.println("\nSelect the difficulty level:"); System.out.println("1. Easy"); System.out.println("2. Medium"); System.out.println("3. Hard"); System.out.println("4. I don't care, just give me the questions!"); } /** * Retrieves a valid integer input from the user within a specified range. * * @param min The minimum valid input value. * @param max The maximum valid input value. * @param scanner The scanner object for reading user input. * @return The integer input provided by the user. */ private static int getUserIntInput(int min, int max, Scanner scanner) { int choice = -9999; // Initial invalid value boolean validInput = false; // Flag to control the input loop while (!validInput) { // as long as the input is not valid, keep asking for input System.out.print("Enter your choice (" + min + "-" + max + "): "); if (scanner.hasNextInt()) { String choiceRaw = scanner.nextLine(); try { choice = Integer.parseInt(choiceRaw); } catch (NumberFormatException e) { System.out.println("Invalid input. Please enter a valid integer."); continue; } // Check if the input is within the valid range if (choice >= min && choice <= max) { validInput = true; // Input is valid, exit the loop } else { System.out.println("Error: Number out of range. Please try again."); } } else { System.out.println("Error: Invalid input. Please enter a number."); scanner.next(); // Discard the invalid input } } if (choice == -9999) { System.out.println("Invalid input. Please try again."); // Something went wrong in the error handling loop. This should never happen. } return choice; } /** * Reduces the list of questions based on the user's input. * * @param questions The list of questions to be shortened. * @param scanner The scanner object for reading user input. * @return A sublist of questions based on the number the user wants to answer. */ private static List<QuizQuestion> cutDownQuestions(List<QuizQuestion> questions, Scanner scanner) { System.out.println("How many questions would you like to answer?"); int numQuestions = getUserIntInput(1, questions.size(), scanner); List<QuizQuestion> cutDownQuestions = new ArrayList<>(); for (int i = 0; i < numQuestions; i++) { cutDownQuestions.add(questions.get(i)); } return cutDownQuestions; } /** * Starts the quiz by displaying questions based on the selected category and difficulty. * * @param categoryIndex The selected category index. * @param scanner The scanner object for reading user input. */ private static void startQuiz(int categoryIndex, Scanner scanner) { displayDifficultyMenu(); int difficultyIndex = getUserIntInput(1, ALL, scanner); // Get user input for the difficulty currentScore = 0; questionIndex = 0; List<QuizQuestion> filteredQuestions = filterQuestions(categoryIndex, difficultyIndex); filteredQuestions = cutDownQuestions(filteredQuestions, scanner); // Limit the number of questions Collections.shuffle(filteredQuestions); // Shuffle the questions for (QuizQuestion question : filteredQuestions) { askQuestion(question, scanner); questionIndex++; } displayFinalScore(filteredQuestions.size()); } /** * Filters questions based on the selected category and difficulty. * * @param categoryIndex The index representing the selected category. * @param difficulty The selected difficulty level. * @return A list of questions matching the category and difficulty. */ private static List<QuizQuestion> filterQuestions(int categoryIndex, int difficulty) { List<QuizQuestion> filtered = new ArrayList<>(); for (QuizQuestion q : questions) { if (q.category.equals(getCategoryName(categoryIndex))) { filtered.add(q); } } if (difficulty != ALL) { for (QuizQuestion q : filtered) { if (q.difficulty != difficulty) { filtered.remove(q); // Remove questions that don't match the selected difficulty } } } return filtered; } /** * Retrieves the category name based on its index. * * @param index The index representing the category. * @return The name of the category. */ private static String getCategoryName(int index) { String[] categories = {"Kinematics", "Dynamics", "Energy & Momentum", "Waves & Optics", "Electricity & Magnetism"}; return categories[index - 1]; } /** * Asks a question to the user and processes their answer. * * @param question The question object containing the question details. * @param scanner The scanner object for reading user input. */ private static void askQuestion(QuizQuestion question, Scanner scanner) { System.out.println("\n[Question " + (questionIndex + 1) + "]"); System.out.println(question.text); for (int i = 0; i < question.options.length; i++) { System.out.println((i + 1) + ". " + question.options[i]); } int answer = getUserIntInput(1, question.options.length, scanner); if (answer == question.correctAnswer) { System.out.println("Correct!"); currentScore++; } else { System.out.println("Incorrect. The correct answer was: " + question.correctAnswer + "."); } } /** * Displays the final score and percentage to the user. * * @param totalQuestions The total number of questions in the quiz. */ private static void displayFinalScore(int totalQuestions) { System.out.println("\nQuiz finished!"); System.out.println("--------------------------------------------------------------------------"); System.out.println("Your final score: " + currentScore + " out of " + totalQuestions); double percentage = (double) currentScore / totalQuestions * 100; System.out.println("Percentage: " + String.format("%.2f", percentage) + "%"); } // Array containing all quiz questions private static final QuizQuestion[] questions = new QuizQuestion[]{ // Kinematics Questions new QuizQuestion("Kinematics", EASY, "What is the formula for average speed?", new String[]{"s = d/t", "s = d * t", "s = d + t", "s = t/d"}, 1), new QuizQuestion("Kinematics", EASY, "Which quantity has both magnitude and direction?", new String[]{"Speed", "Distance", "Time", "Velocity"}, 4), new QuizQuestion("Kinematics", MEDIUM, "A car travels 100 km in 2 hours. What is its average speed?", new String[]{"200 km/h", "50 km/h", "25 km/h", "10 km/h"}, 2), new QuizQuestion("Kinematics", MEDIUM, "An object is dropped from a height. Its initial velocity is:", new String[]{"9.8 m/s", "0 m/s", "Depends on mass", "Depends on height"}, 2), new QuizQuestion("Kinematics", HARD, "A ball is thrown upward with a velocity of 20 m/s. What is its velocity at the highest point?", new String[]{"20 m/s", "10 m/s", "0 m/s", "-10 m/s"}, 3), // Dynamics Questions new QuizQuestion("Dynamics", EASY, "Newton's first law of motion is also known as the law of:", new String[]{"Gravity", "Inertia", "Acceleration", "Reaction"}, 2), new QuizQuestion("Dynamics", EASY, "Which force always opposes motion?", new String[]{"Gravity", "Normal force", "Friction", "Tension"}, 3), new QuizQuestion("Dynamics", MEDIUM, "A 10 kg object experiences a net force of 20 N. What is its acceleration?", new String[]{"0.5 m/s^2", "2 m/s^2", "200 m/s^2", "Cannot be determined"}, 2), new QuizQuestion("Dynamics", MEDIUM, "The force of gravity acting on an object is its:", new String[]{"Mass", "Weight", "Density", "Volume"}, 2), new QuizQuestion("Dynamics", HARD, "A 50 N force is applied at a 30-degree angle to a 10 kg box. What is the horizontal component of the force?", new String[]{"25 N", "43.3 N", "86.6 N", "100 N"}, 2), // Energy & Momentum Questions new QuizQuestion("Energy & Momentum", EASY, "Kinetic energy is the energy of:", new String[]{"Motion", "Position", "Heat", "Sound"}, 1), new QuizQuestion("Energy & Momentum", EASY, "The law of conservation of energy states that energy:", new String[]{"Cannot be created or destroyed", "Can be created but not destroyed", "Can be destroyed but not created", "Is always constant"}, 1), new QuizQuestion("Energy & Momentum", MEDIUM, "A 2 kg ball is moving at 5 m/s. What is its kinetic energy?", new String[]{"5 J", "10 J", "25 J", "50 J"}, 3), new QuizQuestion("Energy & Momentum", MEDIUM, "What is the unit of work?", new String[]{"Newton (N)", "Joule (J)", "Watt (W)", "Meter (m)"}, 2), new QuizQuestion("Energy & Momentum", HARD, "A 1000 kg car traveling at 20 m/s brakes to a stop. How much work is done by the brakes?", new String[]{"200,000 J", "-200,000 J", "10,000 J", "-10,000 J"}, 2), // Waves & Optics Questions new QuizQuestion("Waves & Optics", EASY, "The speed of light in a vacuum is approximately:", new String[]{"3 x 10^8 m/s", "3 x 10^6 m/s", "3 x 10^5 m/s", "3 x 10^3 m/s"}, 1), new QuizQuestion("Waves & Optics", EASY, "The bending of light as it passes from one medium to another is called:", new String[]{"Reflection", "Refraction", "Diffraction", "Dispersion"}, 2), new QuizQuestion("Waves & Optics", MEDIUM, "What is the relationship between the frequency (f) and wavelength (λ) of a wave?", new String[]{"f = λ/v", "f = v/λ", "f = λ * v", "f = v + λ"}, 2), new QuizQuestion("Waves & Optics", MEDIUM, "The image formed by a plane mirror is:", new String[]{"Real and inverted", "Virtual and upright", "Real and upright", "Virtual and inverted"}, 2), // Electricity & Magnetism Questions new QuizQuestion("Electricity & Magnetism", EASY, "Ohm's Law states that the current (I) is directly proportional to:", new String[]{"Resistance", "Voltage", "Power", "Charge"}, 2), new QuizQuestion("Electricity & Magnetism", EASY, "The unit of electric potential difference is:", new String[]{"Ampere (A)", "Ohm (Ω)", "Volt (V)", "Watt (W)"}, 3), new QuizQuestion("Electricity & Magnetism", MEDIUM, "A circuit has a resistance of 10 Ω and a current of 2 A. What is the voltage?", new String[]{"5 V", "20 V", "0.2 V", "200 V"}, 2), new QuizQuestion("Electricity & Magnetism", MEDIUM, "The magnetic field lines around a straight current-carrying wire are:", new String[]{"Parallel to the wire", "Radial from the wire", "Circular around the wire", "None of the above"}, 3) }; } /** * Class representing a quiz question. */class QuizQuestion { String category; // The category of the question (e.g., Kinematics) int difficulty; // The difficulty level of the question (EASY, MEDIUM, HARD) String text; // The question text String[] options; // The possible answers int correctAnswer; // The index of the correct answer (1-based index) public QuizQuestion(String category, int difficulty, String text, String[] options, int correctAnswer) { this.category = category; this.difficulty = difficulty; this.text = text; this.options = options; this.correctAnswer = correctAnswer; } }