如何得到所在窗口失去焦点的消息

Question

addWindowListener(new WindowAdapter(){public void windowGainedFocus(WindowEvent e){
    ....................
} public void windowLostFocus(WindowEvent e){
    ....................
} });

Answer 1

addWindowListener(new WindowAdapter(){public void windowGainedFocus(WindowEvent e){
    ....................
} public void windowLostFocus(WindowEvent e){
    ....................
} });这个加在那里呢

Answer 2

加在你的
Frame/JFrame
Dialog/JDialog
的构造函数中