Java developers

So I'm trying to find a good reference for creating CORBA DII requests in Java when they involve structure and sequence parameters. All of the web references I've found so far only deal with passing simple types as parameters (strings, integers, etc.) I'd like to be able to generate a structure and add it as a parameter to a CORBA dynamic request. Does anyone know how this is done? The documentation is pretty confusing...

I'm writing a Deck class for a card game. So far, 2 methods of the class use the random number generator.
Question: Should I make the Random object an instance variable of the class so that all methods have access to it, or should I create separate Random objects for each method that needs them? What are the pros and cons?

Thanks.