100 Java Mistakes and How to Avoid Them MEAP V05 by copyright-2023-manning-publications.html

Author:copyright-2023-manning-publications.html
Language: eng
Format: epub

This case is similar, though probably it’s easier to reproduce. If the object hash code is Integer.MIN_VALUE, then resulting node will be -8 and it’s unclear what will happen next.

Note that you won’t have this problem if your divisor (NUMBER_OF_NODES in the sample above) is a power of 2, because in this case, the remainder will be zero.

Static analysis

SonarLint reports these problems via rule “S2676: Neither "Math.abs" nor negation should be used on numbers that could be "MIN_VALUE"”. Some cases like the one mentioned above can be detected by SpotBugs via bug patterns “Bad attempt to compute absolute value of signed 32-bit hashcode” and “Bad attempt to compute absolute value of signed random integer”.

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