SunClipboard.java 文件源码

public synchronized void removeFlavorListener(FlavorListener listener) {
    if (listener == null) {
        return;
    }
    AppContext appContext = AppContext.getAppContext();
    EventListenerAggregate contextFlavorListeners = (EventListenerAggregate)
            appContext.get(CLIPBOARD_FLAVOR_LISTENER_KEY);
    if (contextFlavorListeners == null){
        //else we throw NullPointerException, but it is forbidden
        return;
    }
    if (contextFlavorListeners.remove(listener) &&
            --numberOfFlavorListeners == 0) {
        unregisterClipboardViewerChecked();
        currentFormats = null;
    }
}