I'm not the expert on UserInfo, but I'm pretty sure that's a no. You're allowed a specific number of ints and Strings, but you can only store ints and Strings, not arrays.
It can store 10 integers; plus one, if you include the 'score' field. What is the value range for the integers in your array and how many elements will there be?
It's not clear which parts you need help with. Here's an I/O tutorial which might get started:
http://www.tutorialspoint.com/java/java_files_io.htm
Try to ask more specific questions if you need further help.