Previous plasma simulations have used Fortran or other computer languages in which it is difficult to directly express the underlying physics. In a plasma, each particle - electron, ion, or dust - interacts with the external fields and with other particles in ways that can be readily and effectively mimicked by object oriented programming. Thus, we have used JAVA's strong object design to rewrite traditional plasma simulation codes. By using coarse grain and fine grain object design, we incorporate the power of object oriented design for programming and for making the physics clear while paying only a small cost in increased computational time. The JAVA implementation has also the advantage that changes in the underlying physical model can be easily completed swapping or adding objects without large scale revisions of the code.
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