Getting size of a class

["Christopher Fowler" <cfowler@outpostsentinel.com>]

I'm starting a big java project and I want to be very memory usage 
aware.  I found a way to get the size of the heap.  Is there a way I 
can get the size of a class?  Normally in C I can use sizeof() on 
structures.  Is there something similar?

Thanks,
Chris