How to push a Custom Type Object on Stack

--0-261539334-1307511862=:83267
Content-Type: text/plain; charset=us-ascii

Hi

I know how to push Primitive Types on Stack using 
InstructinoList.append(new PUSH(ConstantPoolGen,343)); 

Now i want to push Custom Type Object(Obj of some user defined class i.e. Engine 
Class obj) on Stack in BCEL.

thanks
--0-261539334-1307511862=:83267--