i am a new programmer in java and i am trying to execute a program...

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ButtonTest extends JFrame {
private JButton plainButton, fancyButton;

public ButtonTest()
{
super( "Testing Buttons");
Container c= getContentPane();
c.setLayout(new FlowLayout());

// create buttons

plainButton = new JButton( "Plain Button" );
c.add(plainButton);

Icon bug1 = new ImageIcon( "bug1.gif");
Icon bug2 = new ImageIcon( "bug2.gif");
fancyButton = new JButton( "Fancy Button", bug1);
fancyButton.setRolloverIcon( bug2 );
c.add( fancyButton);


ButtonHandler handler = new ButtonHandler();
fancyButton.addActionListener( handler );
plainButton.addActionListener( handler );

setSize( 275, 100 );
show();

}

public static void main( String args[] )

{
ButtonTest app = new ButtonTest();

app.addWindowListener(
new WindowAdapter() {
public void windowClosing( WindowEvent e )
{
System.exit (0);
}
}
);
}
private class ButtonHandler implements ActionListener {
public void actionPerformed(ActionEvent e )
{
******* JOptionPane.showMessageDiaolog( null,
"You pressed: " + e.getActionCommand());
}
}
}


This is the code...
i am using Java Creator...The error message is


"can not find symbol method ShowmessageDialog(<nulltype>,java.lang.String



*******=ERROR LINE

Thanks from now