code: public void doRandomReads(int readCnt) {
          Random rand = new Random();
          for (int i = 0; i < readCnt; i++) {
              int keyId = rand.nextInt(_initialCapacity);
              String str = "key." + keyId;
              byte[] key = str.getBytes();
              byte[] value = _store.get(key);
              System.out.printf("Key=%s\tValue=%s%n", str, new String(value));
          }
      }
docs: Perform a number of random reads from the underlying data store.
  
  @param readCnt the number of reads