[单项选择题] 下列WindowListener接口方法中当窗口被激活时调用的方法是( )。

[单项选择题] 下列WindowListener接口方法中当窗口被激活时调用的方法是( )。

A．windowActivated(WindowEven
B．windowClosed(WindowEven
C．windowOpened(WindowEven
D．windowDeactivated(WindowEven

参考答案：

A

问题解析:

本题考查关于窗口监听器接口中基本方法的知识。选项A正确，window Activated(WindowEvent)方法在窗口激活时被调用到；选项B错误，windowClosed (WindowEvent)方法在窗口已经被关闭时调用；选项C错误，windowOpened(Win dowEvent)方法在窗口已经打开时被调用到；选项D错误，windowDeactivated(Win dowEvent)方法与窗口不再激活时被调用到。故本题答案是A。