JMenu to the top of the screen

Question

I'm currently making an application that can function on both a windows and make platform, and I was wondering does anyone know where they explain how to add the Menu Bar to the top of the screen on a mac?

Answer 1

My code looks like this, as it says in every example I've read but it doesn't work to no avail. Any suggestions?
MenuBar(){
          vers = System.getProperty("os.name").toLowerCase();
         if (vers.indexOf("mac") != -1)
            //System.setProperty("apple.laf.useScreenMenuBar", "true");
              System.setProperty ("com.apple.macos.useScreenMenuBar","true");
              macFrame=new JFrame();
               menu=new JMenuBar();
              makeFileMenu();
               makeEditMenu();
               makeRecentMenu();
               menu.add(fileMenu);
               menu.add(editMenu);
               menu.add(recentMenu);
               macFrame.setJMenuBar(menu);
               macFrame.setVisible(true);
        }