javafx组合框 <Integer> 类型不匹配

Question

my problem is as follows:

class xxx {
@FXML
private Combobox<Integer> cmb_year;
...
public void method ()
{
 int year=2013;
 cmb_year.getItems().add(year);
 cmb_year.setValue(year) ---> argumenttype mismatch
}
}

It's fragments of my code, but shows the problem I encounter.

I've tried with

• making "int year" to "Integer year"
• Accessing overcmb_year.getSelectionModel().select(new Integer(year))
• Accessing over cmb_year.getSelectionModel().select(year)

Always leads to an argumenttype mismatch.

What can cause this?

Answer 1

If you are trying to set which item is selected, you want to work with the ComboBox's SelectionModel:

cmb_year.getSelectionModel().select(cmb_year.getItems().indexOf(year));

You could also try setSelectedItem(year) or selectLast() .

Answer 2

This may simply be an issue with the ComboBox not being initialized properly or completely. I never use ComboBoxes "out of the box". I use several lines of code to set them up.

Following is a code excerpt from the initialize() method in one of my dialog controller classes (this ComboBox displays a list of Institution objects):

    // this first line gets the data from my data source
    // the ComboBox is referenced by the variable 'cbxInst'

    ObservableList<Institution> ilist = Institution.getInstitutionList(); 
    Callback<ListView<Institution>, ListCell<Institution>> cellfactory =
            new Callback<ListView<Institution>, ListCell<Institution>>() {
                @Override
                public ListCell<Institution> call(ListView<Institution> p) {
                    return new InstitutionListCell();
                }
            };

    cbxInst.setCellFactory(cellfactory);
    cbxInst.setButtonCell(cellfactory.call(null));
    cbxInst.setItems(ilist);

The key points here are:

• I define a cell factory to generate ListCell instances for the ComboBox to display.

• I use the factory to create a ListCell instance to initialize the Button Cell with.

For completeness, here is the private member class from which the Institution ListCell instances are created:

private final class InstitutionListCell extends ListCell<Institution> {

    @Override
    protected void updateItem(Institution item, boolean empty){
        super.updateItem(item, empty);

        if (item != null) {                
            this.setText(item.getName());

        } else {
            this.setText(Census.FORMAT_TEXT_NULL);
        }
    }
}

If you were to initialize your ComboBox in a similar way, it may be that your problems will be solved.