First off all,SIS files are not Java.They are C++ apps for the Symbian OS and yes there is a emulator for them.Download the Series 60 SDK from www.forum.nokia.com
Although there is an emulator for C++ programs you cannot install and run SIS files with it! SIS files contain programs that are compiled for ARM architecture and not WINS. There is no possibility to run an SIS app on the PC.
Java is another story though! There are several JAVA emulators out there! Just use yahoo or google!
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My brother went to Iraq and all I got was a lausy T-shirt saying......"Oops...there are no weapons of mass destruction".