java programming learning.............

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.File;
import java.io.IOException;
public class colorchooser extends JApplet implements ActionListener
{   JFileChooser ch=new JFileChooser();
    JPanel jpanel=new JPanel();
    JButton jbutton,b2;
    JTextField txt;
    public void init()
    {   txt=new JTextField(20);
        jbutton=new JButton("Click here to change colors.");
        b2=new JButton("Click here to openBox");
        b2.addActionListener(this);
        b2.setToolTipText("This is a button to go opendialogBox");
        jbutton.setToolTipText("This is a button to go colorDialog");
        jbutton.addActionListener(this);
        jpanel.add(jbutton);
        jpanel.add(b2);
        jpanel.add(txt);
        getContentPane().add(jpanel);
    }
public void actionPerformed(ActionEvent e)
{   
    if(e.getSource()==jbutton){
        Runtime r=Runtime.getRuntime();
        Process p=null;
        Color color=JColorChooser.showDialog(colorchooser.this,"Select a new color...",Color.orange);
        try {
            p=r.exec("notepad.exe");
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
       

jpanel.setBackground(color);}
    if(e.getSource()==b2){
ch.showOpenDialog(this);
File f=ch.getSelectedFile();
txt.setText(f.toString());
txt.setBackground(Color.red);}

   
   

}
public void showStatus(String f){
   
}
}