Data file produced by Java application

A application developed with pure Java should work on any platform with Java VM. But what about the data file produced by such application? For example: if i developed an application with pure java on PC(windows), then i ran the application and the application produced some data files on PC. Then if i copy both the application and the data files to other platforms (sun work-station, Apple, IBM mainframe, Vax 11, ...), will the application be able to continue load these data files? Is there any difference between java.io 'character stream' and 'byte stream' in terms of data file transfer among different platforms?
Thanks for your consideration.

generally speaking text data files can be used on different systems, but it would depend on the encoding used.
if data portability is a big concern for you then the solution does already exist, it is XML.

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Data file produced by Java application

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