JComboBox con 5 model en un ActionPerformed para un boton registrar

// el jComboBox
String[] lista = {"Uno", "Dos", "Tres", "Cuatro", "Cinco"};
JComboBox combo = new JComboBox(lista);

JButton button = new JButton("registrar");
button.addActionListener(new ActionListener() {

    public void actionPerformed(ActionEvent e)
    {
        String selected = (String)combo.getSelectedItem();
        System.out.println(selected);
    }
});