Blank input from scanner - java

Question

What I\'m trying to do is if the user clicks on the enter key the program should throw a BadUserInputException. My problem is whenever I press the enter key it just puts me

Answer 1

The scanner looks for tokens between whitespaces and newlines - but there aren't any. I don't tend to use Scanner for reading from standard input - I use the old-fashioned BufferedReader method like this:

BufferedReader buf = new BufferedReader (new InputStreamReader (System.in));

and then I can say

String line = buf.readLine ();
if (line.equals ("")) blah();

There may be an easier solution however.