There is a discussion of this in the "How To" section of the Java 3D FAQ.
http://tintoy.ncsa.uiuc.edu/~srp/java3d/faq.html
"Hock, Gregg" wrote:
> Hi again everyone,
> I tried the archived solutions to this problem but without any luck.
> Does anyone have a solution for using JMenuBar, Jmenu and JMenuItem(s) in
> Java3D (app or applet)?
> My problem is with getting the JMenuItems to appear. Is the Canvas3D the
> culprit or Java3D in general?
>
> Relevant source code as follows:
>
> public MyStuff() {
> setLayout(new BorderLayout());
> Canvas3D c = new Canvas3D(null));
> add("Center", c);
>
> JMenuBar menubar = new JMenuBar();
> JMenuItem mi = new JMenuItem();
>
> JMenu file = (JMenu) menubar.add(new JMenu("File"));
> mi = (JMenuItem)file.add(new JMenuItem("Open"));
> mi = (JMenuItem)file.add(new JMenuItem("Save")):
>
> add(menubar);
>
> //Create a simple cube scene
> BranchGroup scene = createSceneGraph();
>
> SimpleUniverse su = new SimpleUniverse(c);
>
> su.addBranchGroup(scene;
>
> }
>
> main() {
> MyStuff ms = new MyStuff();
> ms.init();
> Jframe frame = new Jframe("Hello");
> frame.setSize(256,256);
> frame.getContentPane().add("Center", ms);
> frame.setLocation(100,100);
> frame.setVisible(true);
> }
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