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Question

Java Generate Random number {-1,0,1}

Answer 1

+8 A:

How about generating a random from 0 to 2 and subtracting 1?

Apocalisp 2009-05-23 15:10:08

Genius!!!!!!11!

Tom Hawtin - tackline 2009-05-23 15:13:12

Thought about submitting an Enterprise solution, but it's proprietary.

Apocalisp 2009-05-23 15:14:20

Ya, thanks..............

2009-05-23 15:15:41

Why not generate a random number from 17 to 19 and subtract 18?

Bombe 2009-05-23 15:53:14

@Bombe, you've opened the door to a very dark place. Random number from 0 to 1000 modulus 3 - 1? ;-)

Bob Cross 2009-05-23 17:34:14

I think we should use a randomized recursive Fibonacci function there...

PhiLho 2009-05-23 18:25:57

Answer 2

+11 A:

As Apocalisp wrote, you could do something like:

import java.util.Random;

Random generator = new Random();
int randomIndex = generator.nextInt( 3 ) - 1;

Justin Ethier 2009-05-23 15:13:17

Ha! You beat me by seconds! ;-)

Bob Cross 2009-05-23 15:14:20

Oh boo, I was totally first. Showing code wins every time.

Apocalisp 2009-05-23 15:20:09

Yes, it does. I was hoping to edge out Justin with the javdoc, though. Next time, I should just go for "First P0st!!!111!!@@One!!"

Bob Cross 2009-05-23 15:22:15

First post. Then edit it with pointless code and links to the JavaDoc (just in case anyone doesn't have their favourite JavaDoc location bookmarked). Then replace it with a paraphrase of the second person's correct answer.

Tom Hawtin - tackline 2009-05-23 15:26:11

Awesome! At least everyone else can be confident the code works since its the same one-liner :)

Justin Ethier 2009-05-23 15:26:19

Oh I didn't notice you linked to the javadoc... :(. I voted for this guy cause he had the import statement, which I usually forget to do, causing me to waste 10 minutes trying to find the problem.

2009-05-23 15:31:06

But I dont even think the import statement is needed here... w/e

2009-05-23 15:31:49

Yeah, my two line solution was waaaaaay better because of the javadoc link.... ;-) To be honest, I never ever think about import statements anymore. Whatever IDE you're using (Netbeans or Eclipse at our office) will just import if / when necessary.

Bob Cross 2009-05-23 17:33:07

Answer 3

+3 A:

This should help:

Random random = new Random();
int value = random.nextInt(3) - 1;

Bob Cross 2009-05-23 15:13:52

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Java Generate Random number {-1,0,1}

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