用swing写一个超市管理系统的增删改查

好的，下面是一个简单的超市管理系统的增删改查的Java Swing实现：

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.DefaultTableModel;

public class SupermarketManagementSystem {

    private JFrame frame;
    private JTable table;
    private JTextField textFieldName;
    private JTextField textFieldPrice;
    private JTextField textFieldQuantity;
    private List<Product> products = new ArrayList<Product>();

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    SupermarketManagementSystem window = new SupermarketManagementSystem();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public SupermarketManagementSystem() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();
        frame.setBounds(100, 100, 600, 400);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);

        JLabel lblNewLabel = new JLabel("Name:");
        lblNewLabel.setBounds(10, 10, 50, 20);
        frame.getContentPane().add(lblNewLabel);

        textFieldName = new JTextField();
        textFieldName.setBounds(70, 10, 100, 20);
        frame.getContentPane().add(textFieldName);
        textFieldName.setColumns(10);

        JLabel lblPrice = new JLabel("Price:");
        lblPrice.setBounds(10, 40, 50, 20);
        frame.getContentPane().add(lblPrice);

        textFieldPrice = new JTextField();
        textFieldPrice.setBounds(70, 40, 100, 20);
        frame.getContentPane().add(textFieldPrice);
        textFieldPrice.setColumns(10);

        JLabel lblQuantity = new JLabel("Quantity:");
        lblQuantity.setBounds(10, 70, 50, 20);
        frame.getContentPane().add(lblQuantity);

        textFieldQuantity = new JTextField();
        textFieldQuantity.setBounds(70, 70, 100, 20);
        frame.getContentPane().add(textFieldQuantity);
        textFieldQuantity.setColumns(10);

        JButton btnAdd = new JButton("Add");
        btnAdd.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String name = textFieldName.getText();
                double price = Double.parseDouble(textFieldPrice.getText());
                int quantity = Integer.parseInt(textFieldQuantity.getText());
                Product product = new Product(name, price, quantity);
                products.add(product);
                updateTable();
            }
        });
        btnAdd.setBounds(10, 100, 80, 20);
        frame.getContentPane().add(btnAdd);

        JButton btnDelete = new JButton("Delete");
        btnDelete.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int selectedRow = table.getSelectedRow();
                if (selectedRow >= 0) {
                    products.remove(selectedRow);
                    updateTable();
                }
            }
        });
        btnDelete.setBounds(100, 100, 80, 20);
        frame.getContentPane().add(btnDelete);

        JButton btnUpdate = new JButton("Update");
        btnUpdate.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int selectedRow = table.getSelectedRow();
                if (selectedRow >= 0) {
                    String name = textFieldName.getText();
                    double price = Double.parseDouble(textFieldPrice.getText());
                    int quantity = Integer.parseInt(textFieldQuantity.getText());
                    Product product = new Product(name, price, quantity);
                    products.set(selectedRow, product);
                    updateTable();
                }
            }
        });
        btnUpdate.setBounds(190, 100, 80, 20);
        frame.getContentPane().add(btnUpdate);

        JScrollPane scrollPane = new JScrollPane();
        scrollPane.setBounds(10, 130, 560, 220);
        frame.getContentPane().add(scrollPane);

        table = new JTable();
        table.setModel(new DefaultTableModel(new Object[][] {}, new String[] { "Name", "Price", "Quantity" }) {
            private static final long serialVersionUID = 1L;
            Class<?>[] columnTypes = new Class[] { String.class, Double.class, Integer.class };

            public Class<?> getColumnClass(int columnIndex) {
                return columnTypes[columnIndex];
            }

            boolean[] columnEditables = new boolean[] { false, false, false };

            public boolean isCellEditable(int row, int column) {
                return columnEditables[column];
            }
        });
        scrollPane.setViewportView(table);
    }

    private void updateTable() {
        DefaultTableModel model = (DefaultTableModel) table.getModel();
        model.setRowCount(0);
        for (Product product : products) {
            model.addRow(new Object[] { product.getName(), product.getPrice(), product.getQuantity() });
        }
    }

    private static class Product {
        private String name;
        private double price;
        private int quantity;

        public Product(String name, double price, int quantity) {
            this.name = name;
            this.price = price;
            this.quantity = quantity;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public double getPrice() {
            return price;
        }

        public void setPrice(double price) {
            this.price = price;
        }

        public int getQuantity() {
            return quantity;
        }

        public void setQuantity(int quantity) {
            this.quantity = quantity;
        }
    }
}

这个示例中，我们创建了一个 `Product` 类来表示超市的商品，然后使用 `List` 来存储所有的商品。在 `initialize()` 方法中，我们创建了一个包含 `JLabel` 、`JTextField` 、`JButton` 和 `JTable` 的 `JFrame`。我们使用 `JTextField` 来输入商品的名称、价格和数量，使用 `JButton` 来添加、删除和更新商品，使用 `JTable` 来显示所有商品的信息。我们使用 `DefaultTableModel` 来管理 `JTable` 中的数据，并使用 `updateTable()` 方法来更新 `JTable` 中的数据。当用户点击添加、删除或更新按钮时，我们将读取 `JTextField` 中的数据，创建一个新的 `Product` 对象，并将其添加到 `List` 中或更新 `List` 中的现有对象。最后，我们调用 `updateTable()` 方法来更新 `JTable` 中的数据。