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Thank you very much for the nudge.

ja.append(add0.substring(0,3)+"-"+add0.substring(3,5)+"-"+add0.substring(5)+"\n");

I have never heard about substrings. What are they. Also i will try a loop right now. I dont know why i didnt think of a loop although i dont know how to get it to do that.
would i use an if-for or...

String ja = textArea;
add0 = input number variable;

I need the input number to be 12345678; (input from user 8 numbers)
but when its output (write to .dat) it gets written as 123-45-678:
How...

When i input a number in my append i need to have 3 - in it. for example when i have this number 12345678 I need it to write to file 123-45-678. I would think i need to use the format thing but need...