code: @Override
      public synchronized void remove(String key) {
          boolean deleted = getFileForKey(key).delete();
          removeEntry(key);
          if (!deleted) {
              //todo add queue markers
  //            JusLog.d("Could not delete cache entry for key=%s, filename=%s",
  //                    key, getFilenameForKey(key));
          }
      }
docs: Removes the specified key from the cache if it exists.