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.

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:

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