@Override
    public synchronized final String toString() {
        int accesses = hitCount + missCount;
        int hitPercent = accesses != 0 ? (100 * hitCount / accesses) : 0;
        return String.format(Locale.US, "LruCache[maxSize=%d,hits=%d,misses=%d,hitRate=%d%%]",
                maxSize, hitCount, missCount, hitPercent);
    }
Returns a copy of the current contents of the cache, ordered from least
recently accessed to most recently accessed.
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/util/collection/LruCache.java