英文:
Which event type does JVM generate when a user clicks a radio button? Is it an action event or an item event?
问题
我对Swing组件相当新。然而，我看过许多示例，其中单选按钮实现了actionListener和itemListener。在这种情况下，哪种处理事件的方式是正确的呢？
英文:
I am fairly new to swing components. However, I have seen many examples where a radio button implements actionListener as well as itemListener. Which one is the correct way of handling events in such a case?
答案1
得分: 2
当用户点击单选按钮时，JVM 会生成哪种事件类型？它是操作事件还是项事件？
这取决于已连接到单选按钮的监听器！例如，
AbstractButton.addActionListener(ActionListener)和/或addItemListener(ItemListener)中的一个或两个。另外： 对于这个情况，我建议使用
ActionListener。ItemListener会在选择ButtonGroup中的按钮时产生两个事件。其中一个事件是刚刚被取消选择的项的事件。
英文:
> Which event type does JVM generate when a user clicks a radio button? Is it an action event or an item event?
It depends which listener(s) has(/have) been attached to the radio buttons! E.G. Either or both of AbstractButton.addActionListener(ActionListener) / addItemListener(ItemListener).
Aside: for this I'd recommend an ActionListener.<br>The ItemListener will produce two events when a button in a ButtonGroup is selected. One of the events is for the item which just got deselected.
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