单选题
下列WindowListener接口方法中当窗口被激活时调用的方法是( )。
A) windowActivated(WindowEvent) B) windowClosed(WindowEvent)
C) windowOpened(WindowEvent) D) windowDeactivated(WindowEvent)
A
B
C
D
【正确答案】
A
【答案解析】
[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(WindowEvem)方法在窗口已经打开时被调用到；选项D错误， windowDeactivated(WindowEvent)方法与窗口不再激活时被调用到。故本题答案是A。
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