GUI using Composite Pattern

I'm creating menu bar and sub menus by using composite pattern. here is the code i took from internet but problem is I've no TestMenuFrame class. i'm beginner in design patterns. here is code: MenuBar.java

public class MenuBar extends JComponent {

    public MenuBar() {
        setLayout(new FlowLayout(FlowLayout.LEFT, 2, 2));

    }

    void addMainMenu(MenuComponent mainMenu) {
        JButton btn = new JButton(mainMenu.getName());
        final JPopupMenu popupMenu = new JPopupMenu();
        Iterator<MenuComponent> iterator = mainMenu.iterator();
        if (iterator != null) {
            while (iterator.hasNext()) {
                MenuComponent menuComponent = iterator.next();
                JMenuItem item = new JMenuItem(menuComponent.getName());
                popupMenu.add(item);
            }
        }
        btn.addMouseListener(new MouseAdapter() {

            public void mouseClicked(MouseEvent e) {
                JButton btn = (JButton) e.getSource();
                popupMenu.show(e.getComponent(), e.getX(), e.getY());
            }
        });
        add(btn);
    }
}

MenuComponent.java

public abstract class MenuComponent {

    protected String name;

    public MenuComponent(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public abstract void addMenu(MenuComponent menu);

    public abstract Iterator<MenuComponent> iterator();

}

MyMenu.java

public class MyMenu extends MenuComponent {

    private List<MenuComponent> listMenu = new ArrayList<>();

    public MyMenu(String name) {
        super(name);
    }


    public void addMenu(MenuComponent menu) {
        listMenu.add(menu);
    }


    public Iterator<MenuComponent> iterator() {
        return listMenu.iterator();
    }
}

MyMenuItem.java

 public class MyMenuItem extends MenuComponent {

    public MyMenuItem(String name) {
        super(name);
    }


    public void addMenu(MenuComponent menu) {
//        throw new UnsupportedOperationException("Not supported yet.");
    }


    public Iterator<MenuComponent> iterator() {
//        throw new UnsupportedOperationException("Not supported yet.");
        return null;
    }
}

TestMenu.java

public static void main(String[] args) {
        MenuComponent openMenu = new MyMenu("Open Menu");
        MenuComponent openMenuItem1 = new MyMenuItem("Open Menu Item 1");
        MenuComponent openMenuItem2 = new MyMenuItem("Open Menu Item 2");
        openMenu.addMenu(openMenuItem1);
        openMenu.addMenu(openMenuItem2);
        MenuComponent exitMenuItem = new MyMenuItem("Exit Menu");

        MenuComponent mainMenu = new MyMenu("Main");
        mainMenu.addMenu(openMenu);
        mainMenu.addMenu(exitMenuItem);

        **TestMenuFrame frame = new TestMenuFrame();
        frame.getMyMenuBar().addMainMenu(mainMenu);
        frame.setVisible(true);**
    }

i just need TestMenuFrame class. whose object was created in main.