@Override
        public int compare(BaseDanmaku obj1, BaseDanmaku obj2) {
            return super.compare(obj1, obj2);
        }
this type is used to iterate/remove/insert elements, not support sub/subnew
app/src/main/java/com/sunnyweather/android/flame/master/flame/danmaku/danmaku/model/IDanmakus.java