This rule involves the use of Math.abs and negation on numbers that could be MIN_VALUE. It is a problem because it can
lead to incorrect results and unexpected behavior in the program.
When Math.abs and negation are used on numbers that could be MIN_VALUE, the result can be incorrect due to integer
overflow. Common methods that can return a MIN_VALUE and raise an issue when used together with Math.abs are:
-
Random.nextInt() and Random.nextLong()
-
hashCode()
-
compareTo()
Alternatively, the absExact() method throws an ArithmeticException for MIN_VALUE.
Noncompliant code example
public void doSomething(String str) {
if (Math.abs(str.hashCode()) > 0) { // Noncompliant
// ...
}
}
Compliant solution
public void doSomething(String str) {
if (str.hashCode() != 0) {
// ...
}
}
