DiagnosticCommandImpl.java 文件源码

@Override
public synchronized void removeNotificationListener(NotificationListener listener,
        NotificationFilter filter,
        Object handback)
        throws ListenerNotFoundException {
    boolean before = hasListeners();
    super.removeNotificationListener(listener, filter, handback);
    boolean after = hasListeners();
    if (before && !after) {
        setNotificationEnabled(false);
    }
}