使用idea 基于java，用JFrame创建页面，实现简单的，大界面，具有购物结账功能的页面的代码展示

好的，以下是一个基于Java Swing的简单购物结账页面的代码示例：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class ShoppingCart extends JFrame implements ActionListener {
    private JLabel lblTitle;
    private JPanel pnlItems;
    private JLabel lblItem1, lblItem2, lblItem3, lblItem4;
    private JTextField txtItem1, txtItem2, txtItem3, txtItem4;
    private JPanel pnlButtons;
    private JButton btnAdd, btnRemove, btnCheckout;
    private JTextArea txtAreaCart;

    private double item1Price = 10.0;
    private double item2Price = 20.0;
    private double item3Price = 30.0;
    private double item4Price = 40.0;

    public ShoppingCart() {
        super("购物结账页面");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(700, 500);
        setLayout(new BorderLayout());

        // 标题面板
        lblTitle = new JLabel("欢迎来到我的商店！");
        lblTitle.setFont(new Font("Serif", Font.BOLD, 20));
        JPanel pnlTitle = new JPanel();
        pnlTitle.add(lblTitle);
        add(pnlTitle, BorderLayout.NORTH);

        // 商品面板
        pnlItems = new JPanel();
        pnlItems.setLayout(new GridLayout(4, 2));
        lblItem1 = new JLabel("商品1 ($" + item1Price + "):");
        txtItem1 = new JTextField(5);
        lblItem2 = new JLabel("商品2 ($" + item2Price + "):");
        txtItem2 = new JTextField(5);
        lblItem3 = new JLabel("商品3 ($" + item3Price + "):");
        txtItem3 = new JTextField(5);
        lblItem4 = new JLabel("商品4 ($" + item4Price + "):");
        txtItem4 = new JTextField(5);
        pnlItems.add(lblItem1);
        pnlItems.add(txtItem1);
        pnlItems.add(lblItem2);
        pnlItems.add(txtItem2);
        pnlItems.add(lblItem3);
        pnlItems.add(txtItem3);
        pnlItems.add(lblItem4);
        pnlItems.add(txtItem4);
        add(pnlItems, BorderLayout.CENTER);

        // 按钮面板
        btnAdd = new JButton("添加商品");
        btnAdd.addActionListener(this);
        btnRemove = new JButton("删除商品");
        btnRemove.addActionListener(this);
        btnCheckout = new JButton("结账");
        btnCheckout.addActionListener(this);
        pnlButtons = new JPanel();
        pnlButtons.add(btnAdd);
        pnlButtons.add(btnRemove);
        pnlButtons.add(btnCheckout);
        add(pnlButtons, BorderLayout.SOUTH);

        // 购物车文本区域
        txtAreaCart = new JTextArea();
        add(new JScrollPane(txtAreaCart), BorderLayout.EAST);
    }

    public void actionPerformed(ActionEvent e) {
        String btnText = e.getActionCommand();
        if (btnText.equals("添加商品")) {
            addItem();
        } else if (btnText.equals("删除商品")) {
            removeItem();
        } else if (btnText.equals("结账")) {
            checkout();
        }
    }

    private void addItem() {
        StringBuilder cart = new StringBuilder(txtAreaCart.getText());
        double total = 0;
        if (!txtItem1.getText().isEmpty()) {
            int quantity = Integer.parseInt(txtItem1.getText());
            if (quantity > 0) {
                double price = quantity * item1Price;
                cart.append("商品1 x ").append(quantity).append(" = $").append(price).append("\n");
                total += price;
            }
        }
        if (!txtItem2.getText().isEmpty()) {
            int quantity = Integer.parseInt(txtItem2.getText());
            if (quantity > 0) {
                double price = quantity * item2Price;
                cart.append("商品2 x ").append(quantity).append(" = $").append(price).append("\n");
                total += price;
            }
        }
        if (!txtItem3.getText().isEmpty()) {
            int quantity = Integer.parseInt(txtItem3.getText());
            if (quantity > 0) {
                double price = quantity * item3Price;
                cart.append("商品3 x ").append(quantity).append(" = $").append(price).append("\n");
                total += price;
            }
        }
        if (!txtItem4.getText().isEmpty()) {
            int quantity = Integer.parseInt(txtItem4.getText());
            if (quantity > 0) {
                double price = quantity * item4Price;
                cart.append("商品4 x ").append(quantity).append(" = $").append(price).append("\n");
                total += price;
            }
        }
        cart.append("总计：$").append(total).append("\n");
        txtAreaCart.setText(cart.toString());
    }

    private void removeItem() {
        txtItem1.setText("");
        txtItem2.setText("");
        txtItem3.setText("");
        txtItem4.setText("");
    }

    private void checkout() {
        JOptionPane.showMessageDialog(this, "感谢光临！您的订单已提交。");
        txtAreaCart.setText("");
        txtItem1.setText("");
        txtItem2.setText("");
        txtItem3.setText("");
        txtItem4.setText("");
    }

    public static void main(String[] args) {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setVisible(true);
    }
}

这个页面有一个欢迎标签，四个文本框和三个按钮，分别用于添加商品，删除商品和结账。它还有一个文本区域，用于显示购物车中的商品列表和总价。当用户单击添加商品按钮时，该程序将获取每个文本框中的商品数量，并将其添加到购物车中。当用户单击删除商品按钮时，文本框将被清空。当用户单击结账按钮时，程序将弹出一个对话框，显示感谢信息，并将购物车和文本框清空。

希望这个简单的代码能够帮助到你。