Java - Generate a random -1 or 1?

Question

Does anyone have a quick way to randomly return either 1 or -1?

Something like this probably works, but seems less than ideal:

return Random.nextDouble() > .5 ? 1 : -1;

Answer 1

how about:

random.nextBoolean() ? 1 : -1;

where random is an instance of java.util.Random

Answer 2

return Random.nextInt(2) * 2 - 1;