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Teach your self programming in ten years ? ;)

:D

int[] numbers = new int[8]; this is an array of length 8, i.e. the index range is [0,7]. You're trying to access index 8.

One hint don't google, but go straight to the API docs: String.split()

12121314503 is 11 chars so there must be two 2 digit numbers or one 3 digit number to fit into his 3x3 matrix. Or he has to omit remaining digits. Whatever, without him specifying the exact problems...

Hmm, in the OP he had a 13 and a 50, so that would rule out the charAt() solution.

You can either user String.split() to get a String array containing the individual numbers as Strings, or you can use String.replaceAll() to get rid of the spaces. I'd use the split version.