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Showing content from https://github.com/pmd/pmd/issues/2895 below:

[java] Improve BadComparison and rename to ComparisonWithNaN · Issue #2895 · pmd/pmd · GitHub

Is your feature request related to a problem? Please describe.

• The documentation of errorprone.xml/BadComparison is wrong. The problem with comparing some number to Double.NaN is not floating-point precision, it's that such a comparison always returns false. Double and Float.NaN are not even equal to themselves:

jshell> Double.NaN == Double.NaN
$1 ==> false
jshell> Double.NaN <= Double.NaN
$2 ==> false

• As evidenced by the test above, the rule should care about comparison operators other than == and !=
• The rule name is really vague. Consider renaming it to ComparisonWithNaN

Describe the solution you'd like Described above

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