关于FocusListener的实现，我怎么响应不了，focusLost，focusGained事件啊？

[xxisxx]

我要做一个对话框，但失去焦点的时候就自动关闭（非模式的）
// 首先建立一个简单的对话框
JOptionPane jp = new JOptionPane(errMsg,
icon,
JOptionPane.DEFAULT_OPTION,
null,
new String[] {"OK"},
"OK");

JDialog d = jp.createDialog(null,"MESSAGE");
d.setModal(false);
d.addFocusListener(new MyFocusListener());
d.setVisible(true);


class MyFocusListener implements FocusListener{
public MyFocusListener(){
System.out.print("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA");
}
public void focusLost(FocusEvent evt) {
System.out.println("Focus Losttttttttttt");
JDialog myDialog = (JDialog)evt.getOppositeComponent();
// The component lost the focus.
myDialog.dispose();
}
public void focusGained(FocusEvent evt) {
System.out.println("Focus Gainnnnnnnnnnn");
// The component that lost the focus
Component c = evt.getOppositeComponent();
}
}



我之行的效果是，focusLost和focusGained都没有执行，到底是为什么？不能用JDialog加监听器吗？应该怎么做呢？

[xxisxx]

老规矩，自己顶，多谢各位！ --------- 10。1也没有放假的我，祝大家10。1快乐

[xxisxx]

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