import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.SwingUtilities;

import com.apple.eawt.AboutHandler;
import com.apple.eawt.AppEvent.AboutEvent;
import com.apple.eawt.AppEvent.PreferencesEvent;
import com.apple.eawt.AppEvent.QuitEvent;
import com.apple.eawt.Application;
import com.apple.eawt.PreferencesHandler;
import com.apple.eawt.QuitHandler;
import com.apple.eawt.QuitResponse;

public class MacMenuLeiste {

    public MacMenuLeiste() {
        init();
    }

    private void init() {
        if (getOS().equals("mac")) {
            new MacImpl();
        }

        JMenuBar mBar = new JMenuBar();
        JMenu fileMenu = new JMenu("Datei");
        JMenuItem quitItem = new JMenuItem("Beenden");
        quitItem.addActionListener(e -> System.exit(0));
        fileMenu.add(quitItem);
        mBar.add(fileMenu);
        JFrame frame = new JFrame("Apple Menuleiste");
        frame.setJMenuBar(mBar);
        frame.setSize(300, 300);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        if (getOS().equals("mac")) {
            System.getProperties().put("apple.laf.useScreenMenuBar", "true");
        }
        SwingUtilities.invokeLater(() -> new MacMenuLeiste());
    }

    public static String getOS() {
        String osname = System.getProperty("os.name");
        if (osname != null && osname.toLowerCase().indexOf("mac") != -1) {
            return "mac";
        }
        if (osname != null && osname.toLowerCase().indexOf("windows") != -1) {
            return "win";
        }
        return "noarch";
    }
}

class MacImpl implements ClassSelector, AboutHandler,  PreferencesHandler,
        QuitHandler {

    public MacImpl() {
        handleOS();
    }

    public void handleOS() {
        try {
            final Application application = Application.getApplication();
            application.setAboutHandler(this);
            application.setPreferencesHandler(this);
            application.setQuitHandler(this);
        } catch (Throwable e) {
            System.err.println("setupMacOSXApplicationListener failed: "
                    + e.getMessage());
        }
    }

    public void handleAbout(AboutEvent arg0) {
        // new AboutDialog();
        System.out.println("handleAbout()");
    }

    public void handlePreferences(PreferencesEvent arg0) {
        // new OptionsDialog();
        System.out.println("handlePreferences()");
    }

    public void handleQuitRequestWith(QuitEvent arg0, QuitResponse arg1) {
        System.exit(0);
    }
}

interface ClassSelector {
    public void handleOS();
}