Java Programming

Hi,

I am not sure if this if this is the correct forum, however I need some advice on a project that I am doing.

I am creating a Aquarium Maintanance System, programming it in Java, however some problems arise for instance I do not have the sufficient hardware (thermometer, heater, filter etc.) to use with the Java so I can not demostrate to the person marking that it works correctly. The only thing that I can show is a an example of some of the functionality of the system by creating simulations in certain areas of the system.

What I need advice is, how do I tackle creating the system in Java without having the actual hardware to use, because it seems to me that it would be a system with a bunch of methods but hardly no code in them.

Thanks