public String getLengths() throws IOException {
            StringBuilder result = new StringBuilder();
            for (long size : lengths) {
                result.append(' ').append(size);
            }
            return result.toString();
        }
A {@link ThreadFactory} that builds a thread with a specific thread name
and with minimum priority.
VideoSqlLite/src/main/java/com/yc/videosqllite/disk/DiskLruCache.java