使用idea 基于java，用JFrame创建页面，实现简单的具有简单购物功能的页面的代码展示

好的，以下是一个基于 Java 和 JFrame 创建具有简单购物功能的页面的代码展示：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
import java.util.ArrayList;

public class ShoppingCart extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;

    private JLabel title, productLabel, qtyLabel, priceLabel, cartLabel;
    private JTextField productText, qtyText, priceText;
    private JButton addButton, removeButton, checkoutButton;
    private JList<String> cartList;
    private DefaultListModel<String> cartListModel;
    private ArrayList<Product> productList;

    public ShoppingCart() {
        super("简单购物车");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new BorderLayout());

        // 标题
        title = new JLabel("简单购物车");
        title.setFont(new Font("SansSerif", Font.BOLD, 24));
        title.setHorizontalAlignment(JLabel.CENTER);
        add(title, BorderLayout.NORTH);

        // 商品列表
        JPanel productPanel = new JPanel(new GridLayout(0, 3));
        productLabel = new JLabel("商品名称:");
        productPanel.add(productLabel);
        qtyLabel = new JLabel("数量:");
        productPanel.add(qtyLabel);
        priceLabel = new JLabel("价格:");
        productPanel.add(priceLabel);
        productText = new JTextField();
        productPanel.add(productText);
        qtyText = new JTextField();
        productPanel.add(qtyText);
        priceText = new JTextField();
        productPanel.add(priceText);
        addButton = new JButton("添加");
        addButton.addActionListener(this);
        productPanel.add(addButton);
        add(productPanel, BorderLayout.WEST);

        // 购物车列表
        JPanel cartPanel = new JPanel(new BorderLayout());
        cartLabel = new JLabel("购物车:");
        cartPanel.add(cartLabel, BorderLayout.NORTH);
        cartListModel = new DefaultListModel<String>();
        cartList = new JList<String>(cartListModel);
        JScrollPane scrollPane = new JScrollPane(cartList);
        cartPanel.add(scrollPane, BorderLayout.CENTER);
        removeButton = new JButton("移除");
        removeButton.addActionListener(this);
        cartPanel.add(removeButton, BorderLayout.SOUTH);
        add(cartPanel, BorderLayout.CENTER);

        // 结账按钮
        JPanel checkoutPanel = new JPanel(new FlowLayout());
        checkoutButton = new JButton("结账");
        checkoutButton.addActionListener(this);
        checkoutPanel.add(checkoutButton);
        add(checkoutPanel, BorderLayout.SOUTH);

        // 商品列表数据
        productList = new ArrayList<Product>();
        productList.add(new Product("T恤", 50.00));
        productList.add(new Product("牛仔裤", 80.00));
        productList.add(new Product("运动鞋", 120.00));
        productList.add(new Product("手表", 200.00));

        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        Object source = e.getSource();

        if (source == addButton) {
            // 添加商品到购物车
            String product = productText.getText();
            int qty = Integer.parseInt(qtyText.getText());
            double price = Double.parseDouble(priceText.getText());
            Product p = new Product(product, price);
            int index = productList.indexOf(p);
            if (index != -1) {
                p = productList.get(index);
            } else {
                productList.add(p);
            }
            p.setQty(p.getQty() + qty);
            DecimalFormat df = new DecimalFormat("#.00");
            String item = p.getName() + " x " + p.getQty() + " = ¥" + df.format(p.getPrice() * p.getQty());
            if (!cartListModel.contains(item)) {
                cartListModel.addElement(item);
            }
        } else if (source == removeButton) {
            // 从购物车移除商品
            int index = cartList.getSelectedIndex();
            if (index != -1) {
                String item = cartListModel.getElementAt(index);
                String[] parts = item.split(" x ");
                String name = parts[0];
                int qty = Integer.parseInt(parts[1].split(" = ")[0]);
                Product p = new Product(name, 0);
                int productIndex = productList.indexOf(p);
                if (productIndex != -1) {
                    p = productList.get(productIndex);
                    p.setQty(p.getQty() - qty);
                    if (p.getQty() == 0) {
                        productList.remove(productIndex);
                    }
                }
                cartListModel.removeElementAt(index);
            }
        } else if (source == checkoutButton) {
            // 结账
            double total = 0;
            for (Product p : productList) {
                total += p.getPrice() * p.getQty();
            }
            DecimalFormat df = new DecimalFormat("#.00");
            JOptionPane.showMessageDialog(null, "您的购物车总价为 ¥" + df.format(total), "结账", JOptionPane.INFORMATION_MESSAGE);
        }
    }

    public static void main(String[] args) {
        new ShoppingCart();
    }

    private class Product {
        private String name;
        private double price;
        private int qty;

        public Product(String name, double price) {
            this.name = name;
            this.price = price;
            this.qty = 0;
        }

        public String getName() {
            return name;
        }

        public double getPrice() {
            return price;
        }

        public int getQty() {
            return qty;
        }

        public void setQty(int qty) {
            this.qty = qty;
        }

        @Override
        public boolean equals(Object o) {
            if (o instanceof Product) {
                Product p = (Product) o;
                return name.equals(p.name);
            }
            return false;
        }
    }
}

这个代码展示了一个简单的具有简单购物功能的页面，包括一个商品列表、一个购物车列表和一个结账按钮。用户可以在商品列表中输入商品名称、数量和价格，然后点击“添加”按钮将商品添加到购物车中并显示在购物车列表中。用户还可以从购物车列表中选择某个商品并点击“移除”按钮将商品从购物车中移除。最后，用户可以点击“结账”按钮查看购物车的总价。