public void createCustomer(String name, String address, String postnr,
            String by, String email, String nr)
    {
        if (name != null && address != null && postnr != null && by != null
                && email != null && nr != null)
        {
            Customer c = new Customer(name, address, postnr, by, email, nr);
            customerlist.add(c);
        }

    }