上诉代码为啥无法更行文件

对不起，我之前提供的代码中确实没有包含更新文件的功能。以下是添加了更新文件功能的修改后代码：

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

public class SupermarketCheckout {
    private JFrame frame;
    private JTextField searchField, nameField, quantityField, priceField;
    private JTextArea cartArea;
    private JLabel totalPriceLabel;
    private JButton addButton, checkoutButton;
    private double totalPrice;

    public SupermarketCheckout() {
        frame = new JFrame("Supermarket Checkout");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(500, 400);
        frame.setLayout(new BorderLayout());

        JPanel topPanel = new JPanel();
        topPanel.setLayout(new FlowLayout());

        JLabel searchLabel = new JLabel("Search:");
        searchField = new JTextField(15);
        JButton searchButton = new JButton("Search");
        searchButton.addActionListener(new SearchButtonListener());

        topPanel.add(searchLabel);
        topPanel.add(searchField);
        topPanel.add(searchButton);

        JPanel centerPanel = new JPanel();
        centerPanel.setLayout(new GridLayout(4, 2));

        JLabel nameLabel = new JLabel("Name:");
        nameField = new JTextField(15);
        nameField.setEditable(false);

        JLabel quantityLabel = new JLabel("Quantity:");
        quantityField = new JTextField(15);

        JLabel priceLabel = new JLabel("Price:");
        priceField = new JTextField(15);
        priceField.setEditable(false);

        addButton = new JButton("Add");
        addButton.setEnabled(false);
        addButton.addActionListener(new AddButtonListener());

        centerPanel.add(nameLabel);
        centerPanel.add(nameField);
        centerPanel.add(quantityLabel);
        centerPanel.add(quantityField);
        centerPanel.add(priceLabel);
        centerPanel.add(priceField);
        centerPanel.add(addButton);

        JPanel bottomPanel = new JPanel();
        bottomPanel.setLayout(new BorderLayout());

        JLabel cartLabel = new JLabel("Cart:");
        cartArea = new JTextArea(10, 30);
        cartArea.setEditable(false);

        JScrollPane scrollPane = new JScrollPane(cartArea);

        JPanel totalPricePanel = new JPanel();
        totalPricePanel.setLayout(new FlowLayout(FlowLayout.RIGHT));

        JLabel totalPriceTextLabel = new JLabel("Total Price:");
        totalPriceLabel = new JLabel("0.0");

        totalPricePanel.add(totalPriceTextLabel);
        totalPricePanel.add(totalPriceLabel);

        bottomPanel.add(cartLabel, BorderLayout.NORTH);
        bottomPanel.add(scrollPane, BorderLayout.CENTER);
        bottomPanel.add(totalPricePanel, BorderLayout.SOUTH);

        checkoutButton = new JButton("Checkout");
        checkoutButton.addActionListener(new CheckoutButtonListener());

        frame.add(topPanel, BorderLayout.NORTH);
        frame.add(centerPanel, BorderLayout.CENTER);
        frame.add(bottomPanel, BorderLayout.SOUTH);
        frame.add(checkoutButton, BorderLayout.EAST);

        frame.setVisible(true);
    }

    private void searchProduct(String name) {
        try {
            Scanner scanner = new Scanner(new File("1.txt"));
            while (scanner.hasNextLine()) {
                String line = scanner.nextLine();
                String[] parts = line.split(",");
                if (parts[0].equals(name)) {
                    nameField.setText(parts[0]);
                    quantityField.setText(parts[1]);
                    priceField.setText(parts[2]);
                    addButton.setEnabled(true);
                    return;
                }
            }
            // If product not found
            nameField.setText("");
            quantityField.setText("");
            priceField.setText("");
            addButton.setEnabled(false);
            JOptionPane.showMessageDialog(frame, "Product not found!");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            JOptionPane.showMessageDialog(frame, "File not found!");
        }
    }

    private void addToCart() {
        String name = nameField.getText();
        int quantity = Integer.parseInt(quantityField.getText());
        double price = Double.parseDouble(priceField.getText());
        double subtotal = quantity * price;
        cartArea.append(name + " x " + quantity + " - $" + subtotal + "\n");
        totalPrice += subtotal;
        totalPriceLabel.setText(String.valueOf(totalPrice));
        updateQuantityInFile(name, quantity);
    }

    private void updateQuantityInFile(String name, int quantity) {
        try {
            File inputFile = new File("1.txt");
            File tempFile = new File("temp.txt");

            BufferedReader reader = new BufferedReader(new FileReader(inputFile));
            BufferedWriter writer = new BufferedWriter(new FileWriter(tempFile));

            String line;
            while ((line = reader.readLine()) != null) {
                String[] parts = line.split(",");
                if (parts[0].equals(name)) {
                    int originalQuantity = Integer.parseInt(parts[1]);
                    int updatedQuantity = originalQuantity - quantity;
                    writer.write(parts[0] + "," + updatedQuantity + "," + parts[2]);
                } else {
                    writer.write(line);
                }
                writer.newLine();
            }

            reader.close();
            writer.close();

            if (inputFile.delete()) {
                tempFile.renameTo(inputFile);
            } else {
                throw new IOException("Failed to update file.");
            }
        } catch (IOException e) {
            e.printStackTrace();
            JOptionPane.showMessageDialog(frame, "Failed to update file!");
        }
    }

    private void checkout() {
        frame.dispose();

        JFrame checkoutFrame = new JFrame("Checkout");
        checkoutFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        checkoutFrame.setSize(300, 200);
        checkoutFrame.setLayout(new FlowLayout());

        JLabel thankYouLabel = new JLabel("Thank you for shopping!");
        JLabel totalLabel = new JLabel("Total Price: $" + totalPrice);

        checkoutFrame.add(thankYouLabel);
        checkoutFrame.add(totalLabel);

        checkoutFrame.setVisible(true);
    }

    private class SearchButtonListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            String productName = searchField.getText();
            searchProduct(productName);
        }
    }

    private class AddButtonListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            addToCart();
        }
    }

    private class CheckoutButtonListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            checkout();
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new SupermarketCheckout();
            }
        });
    }
}

这次更新后的代码包含了更新文件的功能。当点击“添加”按钮时，会将商品的数量更新到文件中，以确保文件中的商品数量与购物车中的数量保持一致。

请注意，在运行代码之前，请确保将名为`1.txt`的商品信息文件放置在与代码文件相同的目录中，并按照以下格式编写文件内容：

商品1,数量1,价格1
商品2,数量2,价格2
...

这样，当你点击“添加”按钮时，文件中对应商品的数量将被更新。