public boolean equals(Object o) {
        if (o instanceof Customer) {
            Customer that = (Customer) o;
            if (getCustomerID().equals(that.getCustomerID())
                && getAddress().equals(that.getAddress())
                && getCity().equals(that.getCity())
                && getLastName().equals(that.getLastName())
                && getState().equals(that.getState())
                && getZipCode().equals(that.getZipCode())) {
                return true;
            }
        }

        return false;
    }