// -*- mode:java; encoding:utf-8 -*-

// vim:set fileencoding=utf-8:

// @homepage@

package example;

import java.awt.*;

import java.util.logging.Logger;

import javax.swing.*;

public final class MainPanel extends JPanel {

private MainPanel() {

super(new BorderLayout());

JPanel p = new JPanel(new BorderLayout());

p.setBorder(BorderFactory.createTitledBorder("Toolkit#beep()"));

JButton button = new JButton("showMessageDialog");

button.addActionListener(e -> {

Toolkit.getDefaultToolkit().beep();

// or: getToolkit().beep();

// or: UIManager.getLookAndFeel().provideErrorFeedback((Component) e.getSource());

String msg = "Error Message";

String title = "Title";

JOptionPane.showMessageDialog(getRootPane(), msg, title, JOptionPane.ERROR_MESSAGE);

});

p.add(button);

add(p);

setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));

setPreferredSize(new Dimension(320, 240));

}

public static void main(String[] args) {

EventQueue.invokeLater(MainPanel::createAndShowGui);

}

private static void createAndShowGui() {

try {

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

} catch (UnsupportedLookAndFeelException ignored) {

Toolkit.getDefaultToolkit().beep();

} catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {

Logger.getGlobal().severe(ex::getMessage);

return;

}

JFrame frame = new JFrame("@title@");

frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

frame.getContentPane().add(new MainPanel());

frame.pack();

frame.setLocationRelativeTo(null);

frame.setVisible(true);

}

}