Returns the byte value at the specified index. An index ranges from zero
to length() - 1. The first byte value of the sequence is at
index zero, the next at index one, and so on, as for array
indexing.
Returns the int ECI value at the specified index. An index ranges from zero
to length() - 1. The first byte value of the sequence is at
index zero, the next at index one, and so on, as for array
indexing.
Returns a String that is a subsequence of this sequence.
The subsequence starts with the char value at the specified index and
ends with the char value at index end - 1. The length
(in chars) of the
returned sequence is end - start, so if start == end
then an empty sequence is returned.