code: public static void showMessage(Component component, String message) {
  		JOptionPane.showMessageDialog(SwingUtilities.getWindowAncestor(component), message,
  				UIManager.getString("OptionPane.messageDialogTitle"),
  				JOptionPane.INFORMATION_MESSAGE);
  	}
docs: Affiche une boîte de dialogue d'information.
  @param component Component
  @param message String