private void showEmptyMessage(){
  overlayLabel.setText(ERROR_MESSAGE_TEXT);
  overlayLabel.setFont(ERROR_MESSAGE_FONT);
  overlayLabel.setForeground(Color.BLACK);
  overlayLabel.setIcon(ERROR_MESSAGE_ICON);
}

private void showEmptyMessage ( ) { overlayLabel . setText ( ERROR_MESSAGE_TEXT ) ; overlayLabel . setFont ( ERROR_MESSAGE_FONT ) ; overlayLabel . setForeground ( Color . BLACK ) ; overlayLabel . setIcon ( ERROR_MESSAGE_ICON ) ; }
shows an error message about empty data .
