imprimirTalonario ()

public class Talonario
{
    Boleta bol;
    ArrayList registro = new ArrayList();
    UsaBoleta usaboleta;
    public void imprimirTalonario()
    {
         // Convert ArrayList to Object array
        Object[] elements = registro.toArray();

        // Print Object content
        for (int a = 0; a < elements.length; a++)
        {
            System.out.println(elements[a]);
        }
    }
}

ArrayList<Integer> registro = new ArrayList<Integer>();
    registro.add(10);