The paper describes a pure Java application, consisting of
a numerical code and two GUI, for data generation and
post-processing. The numerical code is an academic, simplified,
implementation of a well-known code in the neutronics community.
Obtained results show fulfilling performances of intensive scalar
and array computations. The most important lesson of this
experience is that the CPU performances are not the only
quality even for a numerical code. Java easiness and
reliability significantly improve developer's and user's
performances. The feasibility and the interest of an
integrated application - GUI, command language and numerical
code - is thus demonstrated.
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