CODEWITHSUNDEEP
javarandom
Jonathan Scialpi
Jonathan Scialpi

Reputation: 841

Is it possible to generate random negative number range in Java?

I have seen MANY posts on here in regard to generating random numbers with a specific range in JAVA (especially this one). However, I have not found one that describes how to generate a random number between a negative MAX and a negative MIN. Is this possible in Java?

For example, if I want to generate a random number that is between (-20) and (-10). Using something like the below will only result in a JAVA Exception that screams about n having to be positive:

int magicNumber=(random.nextInt(-20)-10);

Upvotes: 0

Views: 2001

Answers (3)

Bubletan
Bubletan

Reputation: 3863

I'm not entirely sure what you want, but ThreadLocalRandom has a method which accepts a range, which can also have negative values:

ThreadLocalRandom.current().nextInt(-20, -10 + 1)

There is no practical difference to just negating the result of a positive random though.

Upvotes: 2

gla3dr
gla3dr

Reputation: 2309

Another option would be to generate a random number between 0 and 10 and then subtract 20, if that feels less like a work-around to you.

Upvotes: 2

Amr
Amr

Reputation: 802

Just generate a random number between 10 and 20 and then negate it.

Upvotes: 9

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