如何在java中从折线图中获得值？

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.data.xy.DefaultXYDataset;

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

public class LineChartExample extends JFrame {
    private JFreeChart chart;
    private DefaultXYDataset dataset;
    private JLabel valueLabel;

    public LineChartExample() {
        // 创建折线图对象
        chart = ChartFactory.createXYLineChart(
                "折线图示例", // 标题
                "X轴", // x轴标签
                "Y轴", // y轴标签
                null // 数据集
        );

        // 创建数据集
        dataset = new DefaultXYDataset();
        double[][] data = {{1, 2, 3, 4, 5}, {5, 4, 3, 2, 1}};
        dataset.addSeries("Series 1", data);

        // 将数据集添加到折线图中
        chart.getXYPlot().setDataset(dataset);

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

        // 添加鼠标移动事件监听器
        chartPanel.addMouseMotionListener(new MouseMotionAdapter() {
            @Override
            public void mouseMoved(MouseEvent e) {
                // 获取鼠标所在点的值
                double x = chart.getXYPlot().getDomainAxis().java2DToValue(e.getX(), chartPanel.getScreenDataArea(), chart.getXYPlot().getDomainAxisEdge());
                double y = chart.getXYPlot().getRangeAxis().java2DToValue(e.getY(), chartPanel.getScreenDataArea(), chart.getXYPlot().getRangeAxisEdge());

                // 更新值标签
                valueLabel.setText(String.format("X: %.2f, Y: %.2f", x, y));
            }
        });

        // 创建值标签
        valueLabel = new JLabel("X: 0.00, Y: 0.00");

        // 创建主面板
        JPanel mainPanel = new JPanel(new BorderLayout());
        mainPanel.add(chartPanel, BorderLayout.CENTER);
        mainPanel.add(valueLabel, BorderLayout.SOUTH);

        // 设置窗口属性
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setTitle("折线图示例");
        setContentPane(mainPanel);
        pack();
        setLocationRelativeTo(null);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            LineChartExample example = new LineChartExample();
            example.setVisible(true);
        });
    }
}