如何在JFreeChart中点击并输出[我的例子中的价格]的Y值？

import org.jfree.chart.ChartMouseEvent;
import org.jfree.chart.ChartMouseListener;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.entity.ChartEntity;
import org.jfree.chart.entity.XYItemEntity;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.XYDataset;

public class MyChartMouseListener implements ChartMouseListener {

    private JFreeChart chart;

    public MyChartMouseListener(JFreeChart chart) {
        this.chart = chart;
    }

    @Override
    public void chartMouseClicked(ChartMouseEvent event) {
        ChartEntity entity = event.getEntity();
        if (entity instanceof XYItemEntity) {
            XYItemEntity itemEntity = (XYItemEntity) entity;
            XYDataset dataset = itemEntity.getDataset();
            int seriesIndex = itemEntity.getSeriesIndex();
            int itemIndex = itemEntity.getItem();
            double yValue = dataset.getYValue(seriesIndex, itemIndex);
            System.out.println("Y value: " + yValue);
        }
    }

    @Override
    public void chartMouseMoved(ChartMouseEvent event) {
        // Do nothing
    }
}

// 在使用JFreeChart生成图表的代码中，添加以下代码来注册ChartMouseListener
JFreeChart chart = ...; // 生成图表的代码
ChartRenderingInfo info = new ChartRenderingInfo();
chart.addChangeListener(new StandardChartChangeListener());
chart.addProgressListener(new ChartProgressListener() {
    @Override
    public void chartProgress(ChartProgressEvent event) {
        if (event.getType() == ChartProgressEvent.DRAWING_FINISHED) {
            chart.removeChangeListener(this);
            chart.addChartMouseListener(new MyChartMouseListener(chart));
        }
    }
});
chart.draw(graphics2D, new Rectangle2D.Double(0, 0, width, height), info);