MINI PROJECT

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

class Food {
    private String name;
    private double price;

    public Food(String name, double price) {
        this.name = name;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public double getPrice() {
        return price;
    }
}

class Order {
    private Map<Food, Integer> items;

    public Order() {
        this.items = new HashMap<>();
    }

    public void addItem(Food food, int quantity) {
        items.put(food, items.getOrDefault(food, 0) + quantity);
    }

    public Map<Food, Integer> getItems() {
        return items;
    }

    public double calculateTotal() {
        return items.entrySet().stream()
                .mapToDouble(entry -> entry.getKey().getPrice() * entry.getValue())
                .sum();
    }
}

class Customer {
    private String name;
    private Order currentOrder;

    public Customer(String name) {
        this.name = name;
        this.currentOrder = new Order();
    }

    public Order getCurrentOrder() {
        return currentOrder;
    }

    public String getName() {
        return name;
    }

    public void placeOrder(Order currentOrder2) {
    }
}

class FoodOrderingWindow extends JFrame {
    private List<Food> menu;
    private Customer customer;

    private JTextArea orderTextArea;

    public FoodOrderingWindow() {
        this.menu = new ArrayList<>();
        this.customer = new Customer("John Doe");

        // Adding items to the menu
        menu.add(new Food("Burger", 5.99));
        menu.add(new Food("Pizza", 8.99));
        menu.add(new Food("Salad", 4.99));

        // Initialize GUI components
        setTitle("Food Ordering System");
        setSize(400, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        createComponents();

        // Set the window to be visible
        setVisible(true);
    }

    private void createComponents() {
        // Create a panel for the menu
        JPanel menuPanel = new JPanel();
        menuPanel.setLayout(new GridLayout(menu.size(), 1));

        for (Food food : menu) {
            JButton addButton = new JButton(food.getName() + " - $" + food.getPrice());
            addButton.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    // Add the selected food item to the current order
                    customer.getCurrentOrder().addItem(food, 1);
                    updateOrderTextArea();
                }
            });
            menuPanel.add(addButton);
        }

        // Create a panel for the order and total
        JPanel orderPanel = new JPanel();
        orderPanel.setLayout(new BorderLayout());

        orderTextArea = new JTextArea();
        orderTextArea.setEditable(false);
        orderPanel.add(new JScrollPane(orderTextArea), BorderLayout.CENTER);

        JButton placeOrderButton = new JButton("Place Order");
        placeOrderButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // Place the current order
                customer.placeOrder(customer.getCurrentOrder());
                updateOrderTextArea();
                JOptionPane.showMessageDialog(FoodOrderingWindow.this, "Order placed successfully!");
            }
        });
        orderPanel.add(placeOrderButton, BorderLayout.SOUTH);

        // Create a main panel to hold the menu and order panels
        JPanel mainPanel = new JPanel();
        mainPanel.setLayout(new GridLayout(1, 2));
        mainPanel.add(menuPanel);
        mainPanel.add(orderPanel);

        // Add the main panel to the content pane
        getContentPane().add(mainPanel);
    }

    private void updateOrderTextArea() {
        // Update the text area with the current order details
        Order currentOrder = customer.getCurrentOrder();
        StringBuilder orderText = new StringBuilder("Current Order:\n");
        for (Map.Entry<Food, Integer> entry : currentOrder.getItems().entrySet()) {
            orderText.append(entry.getKey().getName()).append(" x").append(entry.getValue()).append("\n");
        }
        orderText.append("Total: $").append(currentOrder.calculateTotal());
        orderTextArea.setText(orderText.toString());
    }
}

public class FoodOrderingApp {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new FoodOrderingWindow();
            }
        });
    }
}