JFreeChart-Bar Chart

A bar chart is a chart that represents the grouped data with rectangles. The height or length of the bar is propositional to the value that represents the bar.

The following images show some of the demo versions of bar chart incorporated in JFreeChart library:

Bar Chart Demo 1:

Bar Chart Demo 2:

Bar Chart Demo 3:

Bar Chart Demo 4:

Bar Chart example

Let us consider a sample input data for our bar chart example.

Year	Population in Million
Year	USA	INDIA	CHINA
2005	10	15	20
2010	15	20	25
2015	20	25	30

The following codes create a bar chart from the above sample data:

BarChartExample.java

import javax.swing.JFrame;
import javax.swing.SwingUtilities;

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.category.DefaultCategoryDataset;

public class BarChartExample extends JFrame {

  private static final long serialVersionUID = 1L;

  public BarChartExample(String appTitle) {
    super(appTitle);

    // Create Dataset
    CategoryDataset dataset = createDataset();
    
    //Create chart
    JFreeChart chart=ChartFactory.createBarChart(
        "Bar Chart Example", //Chart Title
        "Year", // Category axis
        "Population in Million", // Value axis
        dataset,
        PlotOrientation.VERTICAL,
        true,true,false
       );

    ChartPanel panel=new ChartPanel(chart);
    setContentPane(panel);
  }

  private CategoryDataset createDataset() {
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();

    // Population in 2005
    dataset.addValue(10, "USA", "2005");
    dataset.addValue(15, "India", "2005");
    dataset.addValue(20, "China", "2005");

    // Population in 2010
    dataset.addValue(15, "USA", "2010");
    dataset.addValue(20, "India", "2010");
    dataset.addValue(25, "China", "2010");

    // Population in 2015
    dataset.addValue(20, "USA", "2015");
    dataset.addValue(25, "India", "2015");
    dataset.addValue(30, "China", "2015");

    return dataset;
  }

  public static void main(String[] args) throws Exception {
    SwingUtilities.invokeAndWait(()->{
      BarChartExample example=new BarChartExample("Bar Chart Window");
      example.setSize(800, 400);
      example.setLocationRelativeTo(null);
      example.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
      example.setVisible(true);
    });
  }
}

Output:

Next TopicJfreeChart-Line Chart

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