Javafx combobox cell

@FXML AnchorPane root;
@FXML ComboBox<UserDTO> cmbUsers;
List<UserDTO> users;
public class GateInController implements Initializable {
@Override   
public void initialize(URL location, ResourceBundle resources) {
        users = UserService.getListOfUsers();
        cmbUsers.setItems(FXCollections.observableList(users));
        cmbUsers.getSelectionModel().selectFirst();
        // list of values showed in combo box drop down
        cmbUsers.setCellFactory(new Callback<ListView<UserDTO>,ListCell<UserDTO>>(){
            @Override
            public ListCell<UserDTO> call(ListView<UserDTO> l){
                return new ListCell<UserDTO>(){
                    @Override
                    protected void updateItem(UserDTO item, boolean empty) {
                        super.updateItem(item, empty);
                        if (item == null || empty) {
                            setGraphic(null);
                        } else {
                            setText(item.getUserId()+"    "+item.getUserNm());
                        }
                    }
                } ;
            }
        });
        //selected value showed in combo box
        cmbUsers.setConverter(new StringConverter<UserDTO>() {
              @Override
              public String toString(UserDTO user) {
                if (user == null){
                  return null;
                } else {
                  return user.getUserId();
                }
              }

            @Override
            public UserDTO fromString(String userId) {
                return null;
            }
        });
    }
}

Source: stackoverflow.com

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