How to create an area chart using jfreecharts?

import java.awt.*;
import java.io.*;
import org.jfree.chart.*;
import org.jfree.data.category.*;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.*;
import org.jfree.chart.renderer.category.*;
import org.jfree.chart.plot.*;

public class Area{
public static void main(String arg[]){
  DefaultCategoryDataset dataset = new DefaultCategoryDataset();
  dataset.addValue(4.0, "Science", "Rahul");
  dataset.addValue(3.0, "Maths", "Rahul");
  dataset.addValue(5.0, "Science", "Vinod");
  dataset.addValue(2.0,"Maths", "Vinod");
  dataset.addValue(3.0, "Science", "Prashant");
  dataset.addValue(5.0, "Maths", "Prashant");
  dataset.addValue(6.0, "Science", "Tapan");
  dataset.addValue(2.0, "Maths", "Tapan");
  dataset.addValue(3.0,"Science", "Santosh");
  dataset.addValue(5.0, "Maths", "Santosh");

    JFreeChart chart = ChartFactory.createAreaChart
   ("Comparison between Students Marks","Students", "Marks ",
    dataset, PlotOrientation.VERTICAL, true,true, false);
  chart.setBackgroundPaint(Color.yellow);
  chart.getTitle().setPaint(Color.blue); 
  CategoryPlot p = chart.getCategoryPlot(); 
  p.setForegroundAlpha(0.7f);
  p.setRangeGridlinePaint(Color.red); 
  p.setDomainGridlinesVisible(true);
  p.setDomainGridlinePaint(Color.black);
  CategoryItemRenderer renderer = p.getRenderer();
  renderer.setSeriesPaint(1, Color.red);
  renderer.setSeriesPaint(0, Color.green);
  ChartFrame frame1=new ChartFrame("Area Chart",chart);
  frame1.setVisible(true);
  frame1.setSize(300,300);
  }
}

Java Area Chart