How to Use the ButtonGroup Component如何使用按钮组组件

The ButtonGroup component manages the selected/unselected state for a set of buttons. ButtonGroup组件管理一组按钮的选定/未选定状态。For the group, the ButtonGroup instance guarantees that only one button can be selected at a time.对于组，ButtonGroup实例保证一次只能选择一个按钮。

Initially, all buttons managed by a ButtonGroup instance are unselected.最初，ButtonGroup实例管理的所有按钮都未选中。

How to Use ButtonGroup Features如何使用按钮组功能

You can use ButtonGroup with any set of objects that inherit from AbstractButton. 您可以将ButtongGroup与从AbstractButton继承的任何对象集一起使用。Typically a button group contains instances of JRadioButton, JRadioButtonMenuItem, or JToggleButton. 通常，按钮组包含JRadioButton、JRadioButtonMenuItem或JToggleButton的实例。It would not make sense to put an instance of JButton or JMenuItem in a button group because JButton and JMenuItem do not implement the select/deselect button state.将JButton或JMenuItem的实例放在按钮组中是没有意义的，因为JButton和JMenuItem不实现选择/取消选择按钮状态。

In general, you will typically follow these steps to write code that uses a ButtonGroup component.通常，您将按照以下步骤编写使用ButtongGroup组件的代码。

1. Subclass 子类JFrame
2. Call ContextPane together with a layout manager与布局管理器一起调用ContextPane
3. Declare and configure a set of radio buttons or toggle buttons声明和配置一组单选按钮或切换按钮
4. Instantiate a ButtonGroup object实例化ButtongGroup对象
5. Call the add method on that buttongroup object in order to add each button to the group.调用该buttongroup对象上的add方法，以便将每个按钮添加到组中。

For details and a code example, see How to Use Radio Buttons. 有关详细信息和代码示例，请参阅如何使用单选按钮。It shows how to use a ButtonGroup component to group a set of RadioButtons set into a JPanel.它展示了如何使用ButtongGroup组件将一组RadioButtons集合分组到JPanel中。

The ButtonGroup API按钮组API

ButtonGroup Examples按钮组示例

The following demonstration application uses the ButtonGroup component to group radio buttons displaying on a Window.下面的演示应用程序使用ButtongGroup组件对窗口上显示的单选按钮进行分组。