How to use J2SE classes in blackberry application?

I want to use java.io.FileInputStream, java.io.FileOutputStream, java.io.Object开发者_JS百科InputStream, java.io.ObjectOutputStream classes in my blackberry project. But blackberry supports J2ME[i.e. CLDC], which doesn't contain these classes. Is there any solution to this problem? How to use these classes in blackberry project? Thanks in advance.

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Well, the only way you could use J2SE classes in your project is to re-implement those classes using the provided J2ME core classes. This would be very messy, would probably take a long time and would be rather error prone but it could be done.

You are better served using the classes provided by the CLDC. It does affect code portability but...its a phone: there is a limit to how portable you're going to get.