code: public static Collection<byte[]> getKeyBytes(Collection<String> keys) {
          Collection<byte[]> rv=new ArrayList<byte[]>(keys.size());
          for(String s : keys) {
              rv.add(getKeyBytes(s));
          }
          return rv;
      }
docs: Get the keys in byte form for all of the string keys.
  
  @param keys a collection of keys
  @return return a collection of the byte representations of keys