class DownloadListener1 implements DownloadListener,
        Listener1Assist.Listener1Callback, ListenerAssist {

    @Override public void connectEnd(@NonNull DownloadTask task, int blockIndex, int responseCode,
                                     @NonNull Map<String, List<String>> responseHeaderFields) {
        assist.connectEnd(task);
    }

      DownloadListener1(Listener1Assist assist);
    public  DownloadListener1();

}