charAt
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.
Return
the specified byte value as character or the FNC1 character
Parameters
index
the index of the byte value to be returned
Throws
if the `index` argument is negative or not less than
`length()`Content copied to clipboard
if the value at the `index` argument is an ECI (@see #isECI)Content copied to clipboard