Un truco fácil es añadir un icono vacío a la JMenuItem.La apariencia continuación, añade el separador vertical, que busca (por supuesto, esto sólo funciona con Windows L & M, otro L & F puede hacer esto de manera diferente):
Y el código que producido:
import java.awt.AWTException;
import java.awt.SystemTray;
import java.awt.TrayIcon;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import javax.swing.ImageIcon;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TestTrayIcon {
protected void initUI() {
TrayIcon trayIcon = new TrayIcon(new ImageIcon(
"http://3.bp.blogspot.com/-nh7fv5FqpU4/TeUbTvAdSkI/AAAAAAAAAUo/Ig53KJGvzlk/s45/avatar.png").getImage());
final JPopupMenu popupMenu = new JPopupMenu();
JMenuItem checkBox1 = new JMenuItem("Last checked...", new ImageIcon(new BufferedImage(16, 16, BufferedImage.TYPE_INT_ARGB)));
JMenuItem checkBox2 = new JMenuItem("Open...");
popupMenu.add(checkBox1);
popupMenu.addSeparator();
popupMenu.add(checkBox2);
trayIcon.addMouseListener(new MouseAdapter() {
@Override
public void mouseReleased(MouseEvent e) {
if (e.isPopupTrigger()) {
popupMenu.setLocation(e.getX(), e.getY());
popupMenu.setInvoker(popupMenu);
popupMenu.setVisible(true);
}
}
});
try {
SystemTray.getSystemTray().add(trayIcon);
} catch (AWTException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedLookAndFeelException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
new TestTrayIcon().initUI();
}
});
}
}
ni idea, sólo el 1 por pregunta interesante – mKorbel