可以使用java语言帮我编写下列题目吗：编写GUI界面，模拟抢红包游戏，在界面输入红包大小和抢红包人姓名（用逗号隔开），输出系统当前时间以及每个人抢的红包大小，要求每个人抢的红包最少不能少于0.01元，精确到小数点后两位。使用UTF-8编码，jdk-19

好的，以下是一个简单的 GUI 界面，模拟抢红包游戏的 Java 实现：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Random;

public class RedPacketGameGUI implements ActionListener {
    private JFrame frame;
    private JLabel timeLabel;
    private JLabel nameLabel;
    private JLabel amountLabel;
    private JTextField nameField;
    private JTextField amountField;
    private JButton addButton;
    private JButton startButton;
    private JTextArea resultArea;
    private JScrollPane resultScrollPane;

    private List<RedPacket> redPacketList = new ArrayList<>();

    public static void main(String[] args) {
        new RedPacketGameGUI().run();
    }

    private void run() {
        // 创建窗口
        frame = new JFrame("抢红包游戏");
        frame.setSize(500, 400);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new BorderLayout());

        // 创建顶部面板
        JPanel topPanel = new JPanel(new FlowLayout());
        timeLabel = new JLabel();
        topPanel.add(timeLabel);

        // 创建中间面板
        JPanel centerPanel = new JPanel(new GridLayout(2, 2, 10, 10));
        nameLabel = new JLabel("姓名：");
        nameField = new JTextField();
        amountLabel = new JLabel("红包大小：");
        amountField = new JTextField();
        centerPanel.add(nameLabel);
        centerPanel.add(nameField);
        centerPanel.add(amountLabel);
        centerPanel.add(amountField);

        // 创建底部面板
        JPanel bottomPanel = new JPanel(new FlowLayout());
        addButton = new JButton("添加红包");
        addButton.addActionListener(this);
        startButton = new JButton("开始游戏");
        startButton.addActionListener(this);
        bottomPanel.add(addButton);
        bottomPanel.add(startButton);

        // 创建结果区域
        resultArea = new JTextArea();
        resultArea.setEditable(false);
        resultScrollPane = new JScrollPane(resultArea);

        // 将面板添加到窗口中
        frame.add(topPanel, BorderLayout.NORTH);
        frame.add(centerPanel, BorderLayout.CENTER);
        frame.add(bottomPanel, BorderLayout.SOUTH);
        frame.add(resultScrollPane, BorderLayout.CENTER);

        // 显示窗口
        frame.setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == addButton) {
            // 添加红包
            String name = nameField.getText().trim();
            String amountStr = amountField.getText().trim();
            if (name.isEmpty() || amountStr.isEmpty()) {
                JOptionPane.showMessageDialog(frame, "姓名和红包大小不能为空！", "错误", JOptionPane.ERROR_MESSAGE);
                return;
            }
            double amount = Double.parseDouble(amountStr);
            if (amount < 0.01) {
                JOptionPane.showMessageDialog(frame, "红包大小不能小于0.01元！", "错误", JOptionPane.ERROR_MESSAGE);
                return;
            }
            redPacketList.add(new RedPacket(name, amount));
            nameField.setText("");
            amountField.setText("");
            resultArea.append(name + " 添加了一个红包，大小为 " + String.format("%.2f", amount) + " 元\n");
        } else if (e.getSource() == startButton) {
            // 开始游戏
            if (redPacketList.isEmpty()) {
                JOptionPane.showMessageDialog(frame, "请先添加红包！", "错误", JOptionPane.ERROR_MESSAGE);
                return;
            }
            resultArea.append("\n开始游戏，系统当前时间为 " + getCurrentTime() + "\n");
            while (!redPacketList.isEmpty()) {
                int index = new Random().nextInt(redPacketList.size());
                RedPacket redPacket = redPacketList.get(index);
                double amount = Math.min(redPacket.amount, getTotalAmount(redPacketList) / redPacketList.size() * 2);
                redPacketList.remove(index);
                redPacket.amount -= amount;
                resultArea.append(redPacket.name + " 抢到了 " + String.format("%.2f", amount) + " 元\n");
            }
            resultArea.append("红包已经被抢完，游戏结束！");
            startButton.setEnabled(false);
        }
    }

    private double getTotalAmount(List<RedPacket> redPacketList) {
        double totalAmount = 0;
        for (RedPacket redPacket : redPacketList) {
            totalAmount += redPacket.amount;
        }
        return totalAmount;
    }

    private String getCurrentTime() {
        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
    }

    private class RedPacket {
        String name;
        double amount;

        RedPacket(String name, double amount) {
            this.name = name;
            this.amount = amount;
        }
    }
}

这个程序使用了 Swing GUI 框架，包括顶部面板、中间面板、底部面板和结果区域。用户可以在中间面板输入抢红包人的姓名和红包大小，点击“添加红包”按钮将红包添加到列表中。当用户点击“开始游戏”按钮时，程序会随机抽取红包，计算每个人抢到的红包大小，并在结果区域输出每个人抢到的红包大小。当所有红包都被抢完后，程序会输出游戏结束的信息。