In this basic tutorial, I am walking through how to create category chart using JFreeChart. The program uses the following two jar files, and they come with the JFreeChart itself. You can download JFreeChart at their official website www.jfreechart.org
- jcommon-1.0.15.jar
- jfreechart-1.0.12.jar
The program also demonstrates how easily you can save a generated chart to your computer using the Charts Utilities from JFreeChart
package com.kushal.utilities;
import java.io.File;
import java.io.IOException;
import java.util.Date;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.time.Day;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
public class CategoryChartDemo {
public void createCategoryChart()
{
DefaultCategoryDataset categoryDataset = new DefaultCategoryDataset();
//Enrollment in Bachelors level
categoryDataset.setValue(2003, "Bachelors", "2005");
categoryDataset.setValue(1350, "Bachelors", "2006");
categoryDataset.setValue(2408, "Bachelors", "2007");
categoryDataset.setValue(2607, "Bachelors","2008");
//Enrollment in Masters level
categoryDataset.setValue(985, "Masters", "2005");
categoryDataset.setValue(1400, "Masters", "2006");
categoryDataset.setValue(1634, "Masters", "2007");
categoryDataset.setValue(978, "Masters", "2008");
//Enrollment in PhD level
categoryDataset.setValue(356, "PhD", "2005");
categoryDataset.setValue(390, "PhD", "2006");
categoryDataset.setValue(350, "PhD", "2007");
categoryDataset.setValue(687, "PhD", "2008");
JFreeChart chart = ChartFactory.createBarChart3D
("Program Enrollment (c) www.sanjaal.com", // Title
"Year", // X-Axis label
"Number of Students",// Y-Axis label
categoryDataset, // Dataset
PlotOrientation.VERTICAL,
true, // Show legend
true,
false
);
saveChart(chart);
}
public void saveChart(JFreeChart chart)
{
String fileName="C:/Users/kushal/Desktop/myCategoryChart.jpg";
try {
/**
* This utility saves the JFreeChart as a JPEG
* First Parameter: FileName
* Second Parameter: Chart To Save
* Third Parameter: Height Of Picture
* Fourth Parameter: Width Of Picture
*/
ChartUtilities.saveChartAsJPEG(new File(fileName), chart, 800, 600);
} catch (IOException e) {
e.printStackTrace();
System.err.println("Problem occurred creating chart.");
}
}
public static void main(String args [])
{
new CategoryChartDemo().createCategoryChart();
}
}
The following is the output when you run this program:
Originally posted 2009-01-25 20:38:06.
