Consider the UserController. What is the correct code for selecting User object from usersLv ListView ?

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BlackTom AI · Accepted Answer

The question asks for the correct code to select a User object from the ListView named usersLv in the UserController.

Start by considering how JavaFX ListView exposes the currently chosen item. The ListView has a selection model accessible via getSelectionModel(), and the selected item can be retrieved with getSelectedItem(). Therefore, the expression that yields the currently selected User object is: usersLv.getSelectionModel().getSelectedItem();

Why this form works: getSelectionModel() gives you the selection model associated with the ListView, which manages the selection state. getSelectedItem() returns the value stored at the currently selected index, cast as the ListView's generic type, which here is User. This matches the intent of obtaining the User object that the user has chosen in the UI.

Considerations related to robustness: if nothing is selected, getSelectedItem() will return null, so you may want to guard against null to avoid a NullPointerException when using the result. For example:
- User selected = usersLv.getSelectionModel().getSelectedItem();
- if (selected != null) { ... use selected ... }

If there were other plausible alternatives (not shown here), they would typically involve accessing the selection via the model or index, or perhaps attempting to obtain a String property instead of the User object. However, the direct and idiomatic way to obtain the actual User instance currently selected in a JavaFX ListView is through getSelectionModel().getSelectedItem().

Consider the UserController. What is the correct code for selecting User object from usersLv ListView ?

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