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Bar Chart Example using JFreeChart
Posted on: August 29, 2008 at 12:00 AM

In this code we have extended class ApplicationFrame to create a frame and also pass a string value to the constructor of ApplicationFrame class by using super keyword that will be name of the created frame.

Bar Chart Example using JFreeChart

This Example shows you how to create a bar chart using JFreeChart.
Code given below creates a bar chart of scores of two teams in matches.

Description of the code:
In this code we have extended class ApplicationFrame to create a frame and also pass a string value to the constructor of ApplicationFrame class by using super keyword that will be name of the created frame.

Some methods that are used in this code :
pack(): This method invokes the layout manager.

centerFrameOnScreen(): This method is used for the position of the frame in the middle of the screen.

setVisible(): This method is used for display frame on the screen.

createCategoryDataset(): This method is used to create the instance of CategoryDataset Interface and that contains a copy of the data in an array.
< br> createBarChart(): This method is used to create bar chart for given values. It takestitle, category axis label, value axis label, dataset, PlotOrientation, legend, tool tips and urls as parameters.

BarChartDemo1.java:



import org.jfree.chart.ChartFactory;

import org.jfree.chart.ChartPanel;

import org.jfree.chart.JFreeChart;



import org.jfree.chart.plot.PlotOrientation;

import org.jfree.data.category.CategoryDataset;

import org.jfree.data.general.DatasetUtilities;

import org.jfree.ui.ApplicationFrame;

import org.jfree.ui.RefineryUtilities;



public class BarChartDemo1 extends ApplicationFrame {



  public BarChartDemo1(String title) {

  super(title);



  final CategoryDataset dataset = createDataset();

  final JFreeChart chart = createChart(dataset);



  final ChartPanel chartPanel = new ChartPanel(chart);

  chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));

  setContentPane(chartPanel);

  }



  private CategoryDataset createDataset() { 

  final double[][] data = new double[][] {

  {210,300,320,265,299},

  {200,304,201,201,340},

  };

 return DatasetUtilities.createCategoryDataset("Team ", 

   "Match ", data);

  }



  private JFreeChart createChart(final CategoryDataset dataset) {



  final JFreeChart chart = ChartFactory.createBarChart(

  "Bar Chart Demo", "Category", "Score", dataset,

  PlotOrientation.VERTICAL, true, true, false);

  return chart;

  }



  public static void main(final String[] args) {

 BarChartDemo1 chart = new BarChartDemo1("Vertical Bar Chart Demo");

  chart.pack();

  RefineryUtilities.centerFrameOnScreen(chart);

  chart.setVisible(true);

  }

}

Output:

Download code

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