import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import org.jfree.data.*;
import org.jfree.chart.*;
import org.jfree.chart.plot.*;
import org.jfree.data.category.*;
import org.jfree.chart.renderer.category.*;

public class BarChartExample{
public static void main(String arg[]){
    JButton b=new JButton("Show Graph");
    JFrame f=new JFrame();
    f.setLayout(null);
    b.setBounds(10,10,120,20);
    final JLabel l=new JLabel();
    l.setBounds(10,40,400,300);
    f.add(l);
    f.add(b);
    b.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e){
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        dataset.setValue(72, "Marks", "A");
        dataset.setValue(75, "Marks", "B");
        dataset.setValue(48, "Marks", "C");
        dataset.setValue(98, "Marks", "D");
        dataset.setValue(67, "Marks", "E");
        JFreeChart chart = ChartFactory.createBarChart("BarChart using JFreeChart","Student", "Marks", dataset, 
        PlotOrientation.VERTICAL, false,true, false);
        try{
          File f=new File("C:/chart.jpg");
          ChartUtilities.saveChartAsJPEG(f, chart, 400, 300);
          ImageIcon icon=new ImageIcon(f.getPath());
          l.setIcon(icon);
        }
        catch (IOException ex){
          System.out.println("Problem in creating chart.");
        }
      }
    });
    f.setSize(500,450);
    f.setVisible(true);
  }
}