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

Question

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 ?

查看解析

登录即可查看完整答案

类似问题

What is the name of the method within ListView/TableView to connect it to an underlying ObservableList instance?

What is the name of the method within ListView/TableView to connect it to an underlying ObservableList instance?

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

In a consumer society, many adults channel creativity into buying things

Economic stress and unpredictable times have resulted in a booming industry for self-help products

People born without creativity never can develop it

A product has a selling price of $20, a contribution margin ratio of 40% and fixed cost of $120,000. To make a profit of $30,000. The number of units that must be sold is: Type the number without $ and a comma. Eg: 20000

Which of the following statement regarding cost is correct:

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单