Read From File Then Convert To Int

I am having some difficulties developing my first app. My problem is a bit too specific so I couldn't find if any1 else had the same problem.

After writing a number as a string into memory and reading the said string from memory, I cannot convert it back into a number.

For example, the string written in is 1234, when I retrieve it and write it onto the app, it still shows up as 1234.

When I convert this string to an int using Integer.parseint(), it gives me an error. Then I tried converting a String 123 thats just declared, it works perfectly.

I assume it is the retrieving part that messed up the string and made it unable to be turned into an int. or how to store numbers in memory in other ways?

heres the part of the code that retrieves the string and convert it

FileInputStream fIn = null;
InputStreamReader isr = null;
String data = null;
try{

[Code]...