Method charAt

core/src/main/java/com/google/zxing/common/ECIInput.java:50–50

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. @param index the index of the byte value to be returned @ret

(int index)

  *          if the value at the {@code index} argument is an ECI (@see #isECI)
  */
  char charAt(int index);

 /**
  * Returns a {@code CharSequence} that is a subsequence of this sequence.