Issues in Java-based continuous time step physical modelling

We discuss the problems involved in developing a Java based simulation model of autonomous entities that can navigate themselves in 2-dimensional space. We develop some ideas for solving those problems. The ideas mentioned can be applied to simulations that have fuzzy logic for navigation, encapsulation for object-oriented simulation, many instances of objects, or statistically complex results. We cite reasons for distributing a simulation among several computers and propose several topics for future research.