Segment of Code Results in Exception

Question

This segment of my code seems to result in an exception every time (even when it shouldn't):
Scanner in = new Scanner(System.in);
String s = in.nextLine().trim();
Scanner r = new Scanner(s).useDelimiter(",");
int n = r.nextInt();
int d = r.nextInt();
Anyone know why?

Answer 1

My guess is you entered spaces in your string. ' 5 , 6 ' will generate an exception. ' 5,6 ' with zero spaces between the 5 and 6 works. Trim will remove leading and trailing spaces not those in the middle. Use .replaceAll("[ \t]", "") to remove the middle ones.