jmenu+separator+submenu on java

package menutest;

import javax.swing.JApplet;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JMenu;
import javax.swing.JMenuBar;

public class NewJApplet extends JApplet {

    public void init()
    {
    JMenuBar mb = new JMenuBar();
    JMenu filemenu = new JMenu("Display");
    JMenu pullrightmenu = new JMenu("pull right");

    filemenu.add("Welcome");
    filemenu.addSeparator();
    filemenu.add(pullrightmenu); //add submenu
    filemenu.add("Exit");

    pullrightmenu.add(new JCheckBoxMenuItem("Good Morning!"));
    pullrightmenu.add(new JCheckBoxMenuItem("Good Afternoon!"));
    pullrightmenu.add(new JCheckBoxMenuItem("Good night!"));

    mb.add(filemenu);
    setJMenuBar(mb);
    }



}