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https://issues.apache.org/jira/browse/MATH-758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13221579#comment-13221579
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Luc Maisonobe commented on MATH-758:
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I confirm the use of protected variables in ODE is a design choice.
It was driven by performance considerations and the need to change data in
place at several levels and avoid copying as much as possible. This is also the
reason why tha API provides array as placeholders that must be filled in by the
equation implementation.
If the API were redesigned now, with modern JVM that handle this far better
than a few years ago, of course the design decisions would not be the same.
However, this API is heavily used and would require changes in all user code,
so I would not do it a few days before a release.
> Fields which could be private and/or final
> ------------------------------------------
>
> Key: MATH-758
> URL: https://issues.apache.org/jira/browse/MATH-758
> Project: Commons Math
> Issue Type: Bug
> Reporter: Sebb
>
> BaseAbstractUnivariateIntegrator has several fields that are not currently
> changed after construction and could be final:
> protected double absoluteAccuracy;
> protected double relativeAccuracy;
> protected int minimalIterationCount;
> protected Incrementor iterations;
> protected Incrementor evaluations;
> These all have getters as well, so could also be made private.
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