You can use a BorderLayout for your JPanel and put the JMenuBar into the NORTH area of the panel with JPanel p = new JPanel(); p.setLayout(new BorderLayout()); p.add(menubar, BorderLayout.NORTH); JMenuBar is a JComponent and can be added to a Container like any other JComponent.
I never see that as JMenuItem, I think that alyways placed in JMenuBar import java.awt.ComponentOrientation; import javax.swing.*; public class MenuGlueDemo { public MenuGlueDemo() { JMenuBar menuBar = new JMenuBar(); menuBar.add(createMenu(“Menu 1”)); menuBar.add(createMenu(“Menu 2”)); menuBar.add(createMenu(“Menu 3″)); menuBar.add(new JSeparator()); menuBar.add(new JButton(” Seach …. “)); menuBar.add(new JTextField(” Seach …. “)); menuBar.add(new JComboBox(new Object[]{“height”, “length”, “volume”})); menuBar.add(Box.createHorizontalGlue()); menuBar.add(createMenu(“About”)); JFrame … Read more
Depending on when it’s done, setting the property after your program launches may be too late to be effective. Instead, add the setting at launch time. java -Dapple.laf.useScreenMenuBar=true -jar MyApplication.jar Alternatively, set the property in your application bundle’s Info.plist, as discussed in Java Deployment Options for Mac OS X, Java Dictionary Info.plist Keys, About Info.plist … Read more