将ApplicationFrame 改成 Applet

我想将ApplicationFrame  改成  Applet
 
import  java.awt.Dimension;  
import  javax.swing.JPanel;  
import  org.jfree.chart.*;  
import  org.jfree.chart.plot.PiePlot3D;  
import  org.jfree.data.general.DefaultPieDataset;  
import  org.jfree.data.general.PieDataset;  
import  org.jfree.ui.ApplicationFrame;  
import  org.jfree.ui.RefineryUtilities;  
import  org.jfree.util.Rotation;  
 
//  Referenced  classes  of  package  demo:  
//                        Rotator  
 
public  class  PieChart3DDemo2  extends  ApplicationFrame  
{  
 
       public  PieChart3DDemo2(String  s)  
       {  
               super(s);  
               JPanel  jpanel  =  createDemoPanel();  
               jpanel.setPreferredSize(new  Dimension(500,  270));  
               setContentPane(jpanel);  
       }  
 
       private  static  JFreeChart  createChart(PieDataset  piedataset)  
       {  
               JFreeChart  jfreechart  =  ChartFactory.createPieChart3D("Pie  Chart  3D  Demo  2",  piedataset,  true,  false,  false);  
               PiePlot3D  pieplot3d  =  (PiePlot3D)jfreechart.getPlot();  
               pieplot3d.setStartAngle(270D);  
               pieplot3d.setDirection(Rotation.ANTICLOCKWISE);  
               pieplot3d.setForegroundAlpha(0.6F);  
               pieplot3d.setInteriorGap(0.33000000000000002D);  
               return  jfreechart;  
       }  
 
       private  static  PieDataset  createDataset()  
       {  
               DefaultPieDataset  defaultpiedataset  =  new  DefaultPieDataset();  
               defaultpiedataset.setValue("Java",  new  Double(43.200000000000003D));  
               defaultpiedataset.setValue("Visual  Basic",  new  Double(10D));  
               defaultpiedataset.setValue("C/C++",  new  Double(17.5D));  
               defaultpiedataset.setValue("PHP",  new  Double(32.5D));  
               defaultpiedataset.setValue("Perl",  new  Double(12.5D));  
               return  defaultpiedataset;  
       }  
 
       public  static  JPanel  createDemoPanel()  
       {  
               JFreeChart  jfreechart  =  createChart(createDataset());  
               Rotator  rotator  =  new  Rotator((PiePlot3D)jfreechart.getPlot());  
               rotator.start();  
               return  new  ChartPanel(jfreechart);  
       }  
 
       public  static  void  main(String  args[])  
       {  
               PieChart3DDemo2  piechart3ddemo2  =  new  PieChart3DDemo2("Pie  Chart  3D  Demo  2");  
               piechart3ddemo2.pack();  
               RefineryUtilities.centerFrameOnScreen(piechart3ddemo2);  
               piechart3ddemo2.setVisible(true);  
       }  
}  
 
请问我应该怎么做告诉我谢谢