evaluating of percentiles

Hi,

I'm looking for a java code (not matlab) or a possibility to evaluate percentiles of a 1D, 2D or 3D distribution.

I calculate the time step of each element using the CFL number during simulation. For a max. possible timestep during simulation (gen. alpha, time step manual) I want to use a 10% quantile.

Is there any good idea?

Best regards
Michael