javafx fxml ComboBox Error

Question

Im trying to add a String to a javafx comboBox but i keep getting the above error :/

no suitable method found for add(String)
method Collection.add(CAP#         


        

Answer 1

this is because the ComboBox elements type is not set so it's by defauld "?". like this :

ComboBox room_id = new ComboBox<>(); 

so to force the fxml ComboBox to have String values you have to add something like this :

or set the observable list from code like this :

Java ComboBox .setItems (ObservableList < T > value)