JLabel on JFrame

I have a Minesweeper with a JMenu at the top and a GridLayout that is the Minesweeper, but I would like to add a JLabel at the top and I do not know how.

I've tried it but it shows me below I leave code and photo.

  public Buscaminas(Controlador c) {


            this.controlador = c;
            FILES=controlador.tauler.getFiles();
            COLUMNES=controlador.tauler.getColumnes();
            BOMBES=controlador.tauler.getBombes();

            configuracio();
            botons = new Boto[FILES][COLUMNES];
            configGraella();
            this.pack();
            this.setVisible(true);

            setLayout(null);

            barra=new JMenuBar();
            setJMenuBar(barra);
            menu=new JMenu("Dificultad");
            barra.add(menu);

            facil=new JMenuItem("Facil");
            facil.addActionListener(this);
            menu.add(facil);

            normal=new JMenuItem("Normal");
            normal.addActionListener(this);
            menu.add(normal);

            dificil=new JMenuItem("Dificil");
            dificil.addActionListener(this);
            menu.add(dificil);

            pers=new JMenuItem("Personalizado");
            pers.addActionListener(this);
            menu.add(pers);

           label= new JLabel("Bombas");
           label.setBounds(0, 0, 100, 20);
           add(label);
        }

In the image what I point out is the JLabel I think ...