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java.util.Random.nextDouble() is slow for me and I need something really fast.
I did some google search and I've found only integers based fast random generators. Is here anything for real numbers from interval <0, 1) ?
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int randomNumber = ( int )( Math. random() * 9999 ); if( randomNumber <= 1000 ) { randomNumber = randomNumber + 1000; Math. random() is a method that generates a random number through a formula.
For example, to generate a random number between 1 and 10, we can do it like below. ThreadLocalRandom random = ThreadLocalRandom. current(); int rand = random. nextInt(1, 11);
If you need something fast and have access to Java8, I can recommend the java.utils SplittableRandom. It is faster (~twice as fast) and has better statistical distribution.
If you need a even faster or better algorithm I can recommend one of these specialized XorShift variants:
Information on these algorithms and their quality can be found in this big PRNG comparison.
I made an independent Performance comparison you can find the detailed results and the code here: github.com/tobijdc/PRNG-Performance
TLDR
Never use java.util.Random, use java.util.SplittableRandom.
If you need faster or better PRNG use a XorShift variant.
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