Unchecked call warning

[Nikolas Nikolaou]

Hi.

with the following code:
@FXML private ChoiceBox countChoiceBox; public void choiceSet() { countChoiceBox.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<String>(){ @Override public void changed(ObservableValue<? extends String> ov, String oldFruit, String newFruit) { } }); }



I'm getting this warning:

warning: [unchecked] unchecked call to addListener(ChangeListener<? super T>> as a member of the raw type
ObservableValue

where T is a type-variable:
T extends Object declared in interface ObservableValue


Any suggestions ? I'm not sure what's wrong here.

[Campbell Ritchie]

Don't know. But when I looked up ChangeListener, it said ChangeListener, not ChangeListener<T>, so maybe you are not supposed to make Change Listeners parametrised in the first place.
By the way: what does <T extends String> mean? String is a final class so you cannot make subclasses of it.

[Darryl Burke]

This is what happens when a question is posted in the wrong section. Nikolas, please read Carefully Choose One Forum. I'll move this to JavaFX.

You're getting a warning because ChoiceBox is a raw type; ChoiceBox<String> wouldn't be.

[Nikolas Nikolaou]

Hi. Thanks for both the answers.
I wasn't sure about which forum to place this In. I'll read the guidelines.
I know It's JavaFX but I thought If It's a beginner type question , It should still go In the
beginner's forum.

[Darryl Burke]

Yup, but many of the FX classes -- like ChangeListener -- have counterparts with the same name in AWT and/or Swing. This leads to confusion when FX questions are posted in teh core Java sections.

Have you got rid of the warning?

[Nikolas Nikolaou]

Ok. Noted.
Yes Thanks ! ChoiceBox<String> fixed It.