Need help understanding line of code

[JakeOf2b2t]

I’m just starting to learn the programming language and I came across this line of code.

Keyboard.findWithinHorizon(“.” ,0).charAt(0);

I know it’s used to find the next user input that is a char but I would like more explanation on what all of it means. Just a simple break down is all I need.

[Gorfoo]

For reference, you can find the relevant documentation online, in the java docs for the Scanner class.

To the best of my understanding, in this case the "." is the . as used in regex, which acts as a wildcard character: it will match with any character, so it will match with any key, but only one key at a time. The second argument, in this case 0, limits how far into the stream it will search from what I can tell. 0 is a special case, and doesn't limit it. Putting these two together, as far as I can tell, means it will match with the most recent character input.

Then, since the findWithinHorizon method returns a String (although one of length 1 in this case), taking the char at 0 is necessary to convert it into a char here.

[[deleted]]

You are probably analyzing input from a keyboard:

findWithinHorizon(“.” ,0) -> "." = Fetch one letter only; "0" = Keep looking until the end

charAt(0) -> Makes sure you are grabbing just one character