String fname = textField_1.getText();
String lname = textField_2.getText();
String address=textField_3.getText();
int zipCode= Integer.valueOf(textField_4.getText());
String phoneNumber=textField_6.getText();
ctrCust.insertCustomer(cpr, fname,lname, address,zipCode, phoneNumber);
textField_1.setText("");
textField_2.setText("");
textField_3.setText("");
textField_4.setText("");
textField_6.setText("");