private boolean checkInput()
    {
        boolean result = true;
        result = result && !loginTextField.getText().equals("");
        result = result && !nameTextField.getText().equals("");
        result = result && !surnameTextField.getText().equals("");
        result = result && !passwordField.getText().equals("");
        result = result && !confirmPasswordField.getText().equals("");
        result = result && !streetTextField.getText().equals("");
        result = result && !numberTextField.getText().equals("");
        result = result && !postCodeTextField.getText().equals("");
        result = result && !cityTextField.getText().equals("");
        return result;
    }