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I figured it out. The compiler was adding all of the values together in order to find one value, which was in turn 8 over the amount of integers available to choose from. Is there a way to get all 4...

Line 15 is: int sum = Integer.parseInt(cardNum.substring(1 + 3 + 5 + 7));

the odd thing is none of these are negetive or past the boundaries of the string. That is, unless I screwed up somewhere....

Hi there, I am trying to write a program for a class and I ran into this bug:

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -8
at...