java sorting

 public static void sortBySubtitle(List<MediaBrowserCompat.MediaItem> list) {

        Collections.sort(list, (o1, o2) -> {

            String subtitle1 = ((String) o1.getDescription().getSubtitle());
            String subtitle2 = ((String) o2.getDescription().getSubtitle());

            int compResult = subtitle2.compareToIgnoreCase(subtitle1);

            if (compResult != 0)
                return compResult;

            String title1 = ((String) o1.getDescription().getTitle());
            String title2 = ((String) o2.getDescription().getTitle());

            return title1.compareToIgnoreCase(title2);
        });

    }