如何使用JFreeChart在2行LineChart的X轴上呈现日期值？

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;

import javax.swing.*;
import java.awt.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class LineChartExample {
    public static void main(String[] args) {
        // 创建数据集
        TimeSeries series1 = new TimeSeries("Series 1");
        TimeSeries series2 = new TimeSeries("Series 2");

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        try {
            Date date1 = dateFormat.parse("2021-01-01");
            Date date2 = dateFormat.parse("2021-01-02");

            series1.addOrUpdate(new org.jfree.data.time.Day(date1), 10.0);
            series1.addOrUpdate(new org.jfree.data.time.Day(date2), 15.0);

            series2.addOrUpdate(new org.jfree.data.time.Day(date1), 20.0);
            series2.addOrUpdate(new org.jfree.data.time.Day(date2), 25.0);
        } catch (ParseException e) {
            e.printStackTrace();
        }

        TimeSeriesCollection dataset = new TimeSeriesCollection();
        dataset.addSeries(series1);
        dataset.addSeries(series2);

        // 创建图表
        JFreeChart chart = ChartFactory.createTimeSeriesChart(
                "Line Chart Example", // 图表标题
                "Date", // X 轴标签
                "Value", // Y 轴标签
                dataset // 数据集
        );

        // 配置图表
        chart.setBackgroundPaint(Color.WHITE);

        // 创建图表面板
        ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new Dimension(500, 300));

        // 创建界面窗口
        JFrame frame = new JFrame("Line Chart Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(chartPanel);
        frame.pack();
        frame.setVisible(true);
    }
}