public class TMenBar extends JFrame{
    
    /**
     * 
     */
    private static final long serialVersionUID = -6562446575658301591L;
    
    
    
    static JMenuBar createMenuBar(){
        
        
        JMenu a = new JMenu("aa");
        JMenu b = new JMenu("bb");
        
        a.add(new JMenuItem("1...."));
        a.add(new JMenuItem("2...."));
        
        b.add(new JMenuItem("1...."));
        b.add(new JMenuItem("2...."));
        
        
        JMenuBar bar = new JMenuBar();
        bar.add(a);
        bar.add(b);
        
        
        return bar;
    }
    

    public static void main(String[] args) {
        
        TMenBar tb = new TMenBar();
        
        JLayeredPane pane = tb.getRootPane().getLayeredPane();
        pane.setLayout(new BorderLayout());
        pane.add(createMenuBar() , BorderLayout.SOUTH);
        pane.add(createMenuBar() , BorderLayout.CENTER);
        pane.add(createMenuBar() , BorderLayout.EAST);
        
        tb.setSize(800,400); 
        tb.setLocationRelativeTo(null); 
        tb.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
        tb.setVisible(true);
    
    }

}