Java - JSpinner en tiempo de ejecucion, agregar items

String meses[]={'ENE','FEB','MAR','ABR'};

JSpinner control=new JSpinner();

.setModel(new SpinnerListModel(meses));

//Arrays de String a mostrar

String[] seasons = new String[] {"Spring", "Summer", "Fall", "Winter"};

//Modelo para establecer los valores en JSpinner

SpinnerListModel sModel = new SpinnerListModel(seasons);

//Cargamos el modelo en el JSpinner

JSpinner listSpinner = new JSpinner(sModel);

public class Test extends JFrame{

	private JSpinner spiner;

	private SpinnerListModel modelSpiner;

	private JTextField campo;

	private JButton agregar;

	public Test() {

		ArrayList<String> meses = new ArrayList<String>();

		meses.add("Enero");

		modelSpiner = new SpinnerListModel(meses);

		spiner = new JSpinner(modelSpiner);

		spiner.setPreferredSize(new Dimension(100, 30));

		campo = new JTextField(20);

		agregar = new JButton("Agregar");

		agregar.addActionListener(new AccionAgregar());

		JPanel centro = new JPanel();

		centro.setBorder(BorderFactory.createEmptyBorder(30, 30, 30, 30));

		centro.add(spiner);

		JPanel sur = new JPanel();

		sur.add(campo);

		sur.add(agregar);

		setLayout(new BorderLayout());

		add(centro, BorderLayout.CENTER);

		add(sur, BorderLayout.SOUTH);

		setTitle("Prueba JSpinner");

		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		pack();

		setLocationRelativeTo(null);

		setVisible(true);

	}

	private class AccionAgregar implements ActionListener {

		@Override

		public void actionPerformed(ActionEvent e) {

			ArrayList<String> lista =  (ArrayList<String>) modelSpiner.getList();

			lista.add(campo.getText());

			modelSpiner.setList(lista);

			campo.setText(null);

		}

	}

	public static void main(String[] args) {

		SwingUtilities.invokeLater(new Runnable() {

			@Override

			public void run() {

				new Test();

			}

		});

	}

}