Code Explanation :

1. Movie Class

The Movie class is responsible for holding information about a movie, such as the movie’s name and the number of available seats. It also includes methods to book seats.

class Movie {
    private String name;
    private int availableSeats;

    // Constructor to initialize movie name and available seats
    public Movie(String name, int seats) {
        this.name = name;
        this.availableSeats = seats;
    }

    // Getters
    public String getName() {
        return name;
    }

    public int getAvailableSeats() {
        return availableSeats;
    }

    // Method to book seats by reducing available seats
    public void bookSeats(int seats) {
        if (seats <= availableSeats) {
            availableSeats -= seats; // Reduce available seats
        }
    }

    // Override toString to display movie info in the JComboBox
    public String toString() {
        return name + " (" + availableSeats + " seats)";
    }
}

Purpose:

• The Movie class holds the movie’s name and the number of available seats.
• bookSeats(int seats): This method is used to update the available seats when a user books tickets.

2. Booking Class

The Booking class is used to store the booking details like the movie name and the number of seats booked by the user.

class Booking {
    private String movieName;
    private int bookedSeats;

    // Constructor to store booking details
    public Booking(String movieName, int bookedSeats) {
        this.movieName = movieName;
        this.bookedSeats = bookedSeats;
    }

    // Method to get booking details
    public String getDetails() {
        return "🎥 Movie: " + movieName + " | 🎟️ Tickets: " + bookedSeats;
    }
}

Purpose:

• The Booking class helps store the booking information for each user, which includes the movie name and the number of seats booked.
• getDetails(): Displays the booking summary (movie name and number of seats).

3. MovieTicketBookingGUI Class (Main Class)

This is the core class that ties everything together and displays the GUI. It uses Java Swing components like JComboBox, JTextField, and JTextArea to provide a user interface for the movie ticket booking system.

public class MovieTicketBookingGUI extends JFrame {
    private JComboBox<Movie> movieDropdown;  // Dropdown for selecting movies
    private JTextField ticketField;          // Text field to enter number of tickets
    private JTextArea bookingDetails;        // Text area to display booking details
    private ArrayList<Movie> movies = new ArrayList<>(); // List of available movies
    private ArrayList<Booking> bookings = new ArrayList<>(); // List of bookings made

    public MovieTicketBookingGUI() {
        setTitle("🎬 Movie Ticket Booking System");
        setSize(400, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new GridLayout(6, 1));  // Layout manager for arranging components

        // Initialize movie list
        movies.add(new Movie("Avengers: Endgame", 50));
        movies.add(new Movie("Inception", 40));
        movies.add(new Movie("The Dark Knight", 30));
        movies.add(new Movie("Interstellar", 25));
        movies.add(new Movie("Titanic", 20));

        // Add the movie names to the dropdown menu
        JLabel selectMovieLabel = new JLabel("Select Movie:");
        movieDropdown = new JComboBox<>();
        for (Movie movie : movies) {
            movieDropdown.addItem(movie);
        }

        // Add ticket field
        JLabel ticketLabel = new JLabel("Enter Number of Tickets:");
        ticketField = new JTextField();

        // Book ticket button
        JButton bookButton = new JButton("Book Ticket");
        bookButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                bookTicket();  // Trigger booking process when the button is clicked
            }
        });

        // Text area to display booking details
        bookingDetails = new JTextArea();
        bookingDetails.setEditable(false);

        // Add components to the window
        add(selectMovieLabel);
        add(movieDropdown);
        add(ticketLabel);
        add(ticketField);
        add(bookButton);
        add(new JScrollPane(bookingDetails));

        setVisible(true);  // Show the window
    }

    private void bookTicket() {
        // Get the selected movie and number of tickets
        int selectedIndex = movieDropdown.getSelectedIndex();
        String ticketText = ticketField.getText();

        try {
            int tickets = Integer.parseInt(ticketText);
            if (tickets <= 0 || tickets > movies.get(selectedIndex).getAvailableSeats()) {
                // Show error message if tickets are invalid
                JOptionPane.showMessageDialog(this, "Invalid number of tickets!", "Error", JOptionPane.ERROR_MESSAGE);
                return;
            }

            // Book the tickets and update available seats
            movies.get(selectedIndex).bookSeats(tickets);

            // Add booking details to the list
            bookings.add(new Booking(movies.get(selectedIndex).getName(), tickets));

            // Update the movie dropdown to reflect remaining seats
            movieDropdown.insertItemAt(movies.get(selectedIndex), selectedIndex);
            movieDropdown.removeItemAt(selectedIndex + 1);

            // Display booking details
            bookingDetails.append("🎥 Movie: " + movies.get(selectedIndex).getName() + "\n🎟️ Tickets: " + tickets + "\n\n");

            // Show success message
            JOptionPane.showMessageDialog(this, "✅ Booking Successful!", "Success", JOptionPane.INFORMATION_MESSAGE);
            ticketField.setText("");  // Clear ticket field

        } catch (NumberFormatException ex) {
            // Handle invalid number input
            JOptionPane.showMessageDialog(this, "Please enter a valid number!", "Error", JOptionPane.ERROR_MESSAGE);
        }
    }

    public static void main(String[] args) {
        new MovieTicketBookingGUI();  // Launch the GUI
    }
}

Purpose:

• Sets up the GUI for the movie ticket booking system.
• It manages the user interactions like:
  • Selecting a movie from a dropdown.
  • Entering the number of tickets.
  • Booking the tickets and displaying booking details.