public boolean comprobarAnadir() {
        boolean z = true;
        if (jTextFieldNombre.getText().compareToIgnoreCase("") == 0 || jTextFieldApellidos.getText().compareToIgnoreCase("") == 0 || jTextFieldApellidos.getText().compareToIgnoreCase("") == 0 || jTextFieldNumCuenta.getText().compareToIgnoreCase("") == 0
                || jTextFieldSaldoIni.getText().compareToIgnoreCase("") == 0 || jComboBoxTipoCuenta.getSelectedIndex() == 0) {
            z = false;
        }

        return z;
    }