JavaFX 2.0 selection box problem How do I update the choicebox representing the object list when updating objects?

I have a list object choice@R_680_2419 @. when the name representing one of the objects is changed by another code, the name in the drop-down list of the selection box will not change For example, if I have a selection box consisting of a list of test objects The test code is as follows:

class Test {
    String name;

    public Test(String name) {
        this.name = name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    @Override
    public String toString() {
        return name; 
    }
}

Then select @ R_ 680_ 2419 @ as follows:

Choice@R_680_2419@<Test> chi = new Choice@R_680_2419@<>();
ObservableList<Test> items = FXCollections.observableArrayList();
chi.setItems(items);
items.addAll(new Test("ITEM1"),new Test("ITEM2"),new Test("ITEM3"));

Choice@R_680_2419 @The Item1, Item2, and Item3 lists are displayed

If I then change the name of one of the projects through the following code:

items.get(1).setName("CHANGED");

Choice@R_680_2419 @The Item1, Item2 and Item3 lists will still be displayed How can I make it update and display lists Item1, changed and Item3?

Solution

Just for completeness – in FX2, you may be trapped by the replace approach outlined in another answer Starting with fx8, there is a mechanism to tell a list to listen for changes to its contained items (of course, if your item has properties and notifies the listener of changes):

/** changed item to 
 *  - use property and notify on change
 *  - not override toString (for visuals,use converter instead)
 */ 
class Test {
    StringProperty name;

    public Test(String name) {
        setName(name);
    }

    public StringProperty nameproperty() {
         if (name == null) name = new SimpleStringProperty(this,"name");
         return name;
    }
    public void setName(String name) {
        nameproperty().set(name);
    }

    public String getName() {
        return nameproperty().get();
    }

} 

// use in collection with extractor
ObservableList<Test> items = FXCollections.observableList(
    e -> new Observable[] {e.nameproperty()} );
items.addAll(...);
choice@R_680_2419@ = new Choice@R_680_2419@<>(items);
// tell the choice how to represent the item
StringConverter<Test> converter = new StringConverter<Test>() {

    @Override
    public String toString(Test album) {
        return album != null ? album.getName() : null;
    }

    @Override
    public Test fromString(String string) {
        return null;
    }

};
choice@R_680_2419@.setConverter(converter);