Storing data in binary files

I am trying to store my data in binary files to save space and lessen time spent on hard disk reads. However, I can't seem to find the proper way to do this in java.

For example, I have the integer 65535 in java. How do I convert it into a 2 byte string FF FF in java?

When I read 2 bytes FF FF to a string from a binary file, how do I interpret it as a -32767 or a 65535 ?

Sorry if this seems like a really obvious question. None of the integer or string methods in java seems to do what I want :(

[524 byte] By [Big_Ducka] at [2007-11-26 12:44:46]