File Dialog In AWT

File Dialog:

import java.awt.*;
import java.awt.event.*;
public class DialogApplication extends Frame implements ActionListener, WindowListener
{
Button l,s;
TextField tf;
public static void main(String s[])
{
DialogApplication da=new DialogApplication();
da.setVisible(true);
da.setSize(200,200);
}
DialogApplication()
{
super("Dialog Application");
setLayout(new FlowLayout());
l=new Button("Load");
l.addActionListener(this);
add(l);
s=new Button("Save");
s.addActionListener(this);
add(s);
tf=new TextField(20);
add(tf);
addWindowListener(this);
}
public void actionPerformed(ActionEvent ae)
{
FileDialog fd;
if (ae.getSource() == l)
{
fd=new FileDialog(this, "FileDialog",FileDialog.LOAD);
}
else
{
fd=new FileDialog(this, "FileDialog",FileDialog.SAVE);
}
fd.show();
String filename=fd.getFile();
if(filename!=null)
{
tf.setText(filename);
}
}
public void windowActivated(WindowEvent we){}
public void windowClosed(WindowEvent we){}
public void windowClosing(WindowEvent we){System.exit(0);}
public void windowDeactivated(WindowEvent we){}
public void windowDeiconified(WindowEvent we){}
public void windowIconified(WindowEvent we){}
public void windowOpened(WindowEvent we){}     }