Any1 know drawin pie chart using jfreechart

[Mingyu]

does anyone know how to use jfreechart n draw pie chart?? wat my fren did is diff from what i read in the internet resources i found. i am using MySql as my backbone database, using servlets to view it in web browser.i dun understand wat each line means onli some i noe.
*****************my fren codes(Charts.java**********************
/***************************************************************
Class Name: Charts
Functionality: Creates Charts
***************************************************************/
import java.awt.*;
import java.awt.geom.*;
import java.awt.Paint;
import org.jfree.chart.*;
import org.jfree.chart.axis.*;
import org.jfree.chart.plot.*;
import org.jfree.chart.labels.*;
import org.jfree.chart.renderer.*;
import org.jfree.data.*;
import org.jfree.data.time.*;
import org.jfree.util.*;
import org.jfree.chart.ChartFactory;
import org.jfree.data.DefaultPieDataset;

public class Charts
{
//initialize variable
JFreeChart chart = null;
//class constructor
public Charts()
{
}
//called by convert.class to create chart
public void createChart(String chartName, String items[], double percentage[])
{
//creates dataset first
PieDataset dataset = createDataset(items, percentage);
//creates 3D effect pie-chart
chart = ChartFactory.createPieChart3D(chartName, dataset, true, false, false);
/*
Parameters for ChartFactory.createPieChart3D:
title - the chart title.
data - the dataset for the chart.
legend - a flag specifying whether or not a legend is required.
tooltips - configure chart to generate tool tips?
urls - configure chart to generate URLs?
*/
//set background color of chart - default is yellow but i want to set it to white
//chart.setBackgroundPaint(Color.white);
//adjust pie-chart settings
Pie3DPlot pie3dplot = (Pie3DPlot)chart.getPlot();
pie3dplot.setStartAngle(360);
pie3dplot.setDirection(Rotation.CLOCKWISE);
pie3dplot.setBackgroundPaint(Color.lightGray);
pie3dplot.setSectionPaint(0,Color.green);
pie3dplot.setSectionPaint(1,Color.blue);
pie3dplot.setForegroundAlpha(0.5F);
pie3dplot.setNoDataMessage("No data to display");
//Types of labels
//NO_LABELS, NAME_LABELS, VALUE_LABELS, PERCENT_LABELS, NAME_AND_VALUE_LABELS, NAME_AND_PERCENT_LABELS, VALUE_AND_PERCENT_LABELS
pie3dplot.setSectionLabelType(PiePlot.VALUE_AND_PERCENT_LABELS);
pie3dplot.setNoDataMessage("No data available");
}
//creates pie chart data based on items and percentage array
public PieDataset createDataset(String items[], double percentage[])
{
//creates default piechart dataset
DefaultPieDataset dataset = new DefaultPieDataset();
int iMaxItems = items.length;
if (percentage.length < iMaxItems)
{
iMaxItems = percentage.length;
}
//populate pie chart values
for (int i = 0 ; i < iMaxItems ; i++)
{
//sets values of pie chart
dataset.setValue(items[i], percentage[i]);
}
return dataset;
}
//draws piechart
public void draw(Graphics2D g, Rectangle2D r)
{
chart.draw(g, r);
}
}

[Ernest Friedman-Hill]

Mr Rocks,
Welcome to JavaRanch!
We don't have too many rules around here, but we do have our naming policy which requires that your display name be a real name, not an obvious fake. Please go here and update yours, pronto! Thanks, pardner.

[Dirk Schreckmann]

Moving this to the Other Open Source Projects forum...