Java JFreechart MouseEvent

import java.awt.*;
import javax.swing.*;
import org.jfree.ui.*;
import org.jfree.chart.*;
import org.jfree.chart.plot.*;
import org.jfree.data.general.*;
import org.jfree.chart.entity.*;

public class PieChart extends ApplicationFrame implements ChartMouseListener {
private JFreeChart chart; 
private PiePlot plot;
private int angle=270;
private static double explodePercent = 0.99;
private static long count=0;

public PieChart(String title){
    super(title);
        this.chart = ChartFactory.createPieChart("Pie Chart Demo",createDataset(),  true,  true, false);
        this.plot = (PiePlot) chart.getPlot();
        this.plot.setSectionOutlinesVisible(false);
        this.plot.setNoDataMessage("No data available");
        this.plot.setBackgroundAlpha(0.2f);
        this.plot.setBackgroundPaint(Color.WHITE); 
        this.angle=270;
        ChartPanel chartpanel = new ChartPanel(chart, false, false, false, false, false);   
        chartpanel.setVisible(true);
        chartpanel.addChartMouseListener(this);
        chartpanel.setPreferredSize(new Dimension(500, 270));
        setContentPane(chartpanel);
}
private static PieDataset createDataset() {
    DefaultPieDataset dataset = new DefaultPieDataset();
    dataset.setValue("One", new Double(10.0));
    dataset.setValue("Two", new Double(20.0));
    dataset.setValue("Three", new Double(30.0));
    dataset.setValue("Four", new Double(40.0));
    dataset.setValue("Five", new Double(10.0));
    return dataset;
}
private static JFreeChart createChart(PieDataset dataset) {

    JFreeChart chart = ChartFactory.createPieChart3D("Pie Chart Demo",dataset, true, true,false);

    PiePlot plot = (PiePlot) chart.getPlot();
    plot.setSectionOutlinesVisible(false);
    plot.setNoDataMessage("No data available");
    plot.setBackgroundAlpha(0.2f);
    return chart;
}
public static JPanel createDemoPanel() {
    JFreeChart chart = createChart(createDataset());
    ChartPanel chartpanel = new ChartPanel(chart, false, false, false, false, false);   
    chartpanel.setVisible(true);      
    chartpanel.setPreferredSize(new Dimension(500, 270));
    return new JPanel();
}
public static void main(String[] args) {
    PieChart demo = new PieChart("Pie Chart");
    demo.pack();
    RefineryUtilities.centerFrameOnScreen(demo);
    demo.setVisible(true);
}
public void chartMouseClicked(ChartMouseEvent chartmouseevent){
ChartEntity chartentity = chartmouseevent.getEntity();
if (chartentity != null){
   System.out.println("Mouse clicked: " + chartentity.toString());
}
else
System.out.println("Mouse clicked: null entity.");
}

public void chartMouseMoved(ChartMouseEvent chartmouseevent){
}
}