challenge 10.2 answer modify

[ppk03]

I belive the following code for challenge 10.2:

private boolean checkNext(TokenType tokenType) {
  if (isAtEnd()) return false;
  if (tokens.get(current + 1).type == EOF) return false;
  return tokens.get(current + 1).type == tokenType;
}

would be better if you change it to:

private boolean checkNext(TokenType type) {
  if (isAtEnd()) return false;
  return tokens.get(current + 1).type == type;
}

If someone type "checkNext(EOF)", he can still get correct result.

[munificent]

If someone type "checkNext(EOF)", he can still get correct result.

That's true, but the parser never needs to do that. (It would also be a little strange if there was a place in the grammar where the interpretation of a token changed only if it was literally the last token in the file.)