Hi Friend,

Try the following code:

import java.io.*;
import java.text.*;
import org.jfree.data.*;
import org.jfree.ui.*;
import org.jfree.chart.*;
import org.jfree.chart.axis.*;
import org.jfree.chart.plot.*;
import org.jfree.data.category.*;
import org.jfree.chart.renderer.category.*;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;

public class ChartDemo{
public static void main(String arg[]){
  DefaultCategoryDataset dataset = new DefaultCategoryDataset();
  dataset.setValue(60, "Marks", "A");
  dataset.setValue(75, "Marks", "B");
  dataset.setValue(40, "Marks", "C");
  dataset.setValue(90, "Marks", "D");
  dataset.setValue(20, "Marks", "E");
  JFreeChart chart = ChartFactory.createBarChart("Bar Chart","Student", "Marks", dataset, 
  PlotOrientation.VERTICAL, false,true, false);
  CategoryPlot p = chart.getCategoryPlot(); 
  NumberAxis rangeAxis = (NumberAxis) p.getRangeAxis();
  rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
  BarRenderer renderer = (BarRenderer) p.getRenderer();
  DecimalFormat decimalformat1 = new DecimalFormat("##");
  renderer.setItemLabelGenerator(new StandardCategoryItemLabelGenerator("{2}", decimalformat1));
  renderer.setItemLabelsVisible(true);
  chart.getCategoryPlot().setRenderer(renderer);
  ChartFrame frame=new ChartFrame("Bar Chart",chart);
  frame.setVisible(true);
  frame.setSize(350,450);
    }
}

Thanks