Window.java 文件源码

protected void processWindowFocusEvent(WindowEvent e) {
    for (Iterator<?> i = windowFocusListeners.getUserIterator(); i.hasNext();) {
        WindowFocusListener listener = (WindowFocusListener) i.next();
        switch (e.getID()) {
            case WindowEvent.WINDOW_GAINED_FOCUS:
                listener.windowGainedFocus(e);
                break;
            case WindowEvent.WINDOW_LOST_FOCUS:
                listener.windowLostFocus(e);
                break;
        }
    }
}