This is a program to display a pie chart. I also have a button. But the program I have written, creates two separate frames and one frame is for the pie chart and the other is for the button. How do I put both button and pie chart on the same frame?? Can you please rectify my program.

import java.awt.*;

import org.jfree.chart.*;

import org.jfree.chart.title.*;

import org.jfree.data.general.DefaultPieDataset;

import org.jfree.ui.*;

import java.io.*;

import javax.swing.*;

import java.awt.event.*;

import javax.swing.filechooser.*;

public class Pie{

public static void getFile(File f) {

System.out.println("File is: "+f.getName());

}

public static void main(String[] args) {

JPanel panel=new JPanel();

    panel.setLayout(null);

    JButton b=new JButton("Open File");

    b.addActionListener(new ActionListener()

{

        public void actionPerformed(ActionEvent e)

{

        JFileChooser chooser=new JFileChooser();

        int ret = chooser.showDialog(null, "Open file");

        if (ret == JFileChooser.APPROVE_OPTION)

        {

        File file = chooser.getSelectedFile();

        getFile(file);

        }

       }

    }

); b.setBounds(50,40,100,35);

    panel.add(b);

DefaultPieDataset pieDataset = new DefaultPieDataset();

pieDataset.setValue("A", new Integer(10));

pieDataset.setValue("B", new Integer(20));

pieDataset.setValue("C", new Integer(30));

pieDataset.setValue("D", new Integer(10));

pieDataset.setValue("E", new Integer(20));

pieDataset.setValue("F", new Integer(10));

JFreeChart chart = ChartFactory.createPieChart("Pie Chart using JFreeChart", pieDataset, true,true,true);

ChartFrame frame1=new ChartFrame("Pie Chart",chart);

frame1.add(panel);

frame1.setVisible(true);

frame1.setSize(600,600);

}

}