private String generateString() {
    Random rand = ThreadLocalRandom.current();
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < rand.nextInt(10); ++i) {
      sb.append((char) ('A' + rand.nextInt(26)));
    }
    return sb.toString();
  }
Runs the tools.
@param args command-line arguments
@return true in case of success
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/CreateRandomStoreFile.java