Commons RNG – RNG
Apache Commons RNG ™
Last Published: 16 Apr 2026
Version: 1.7
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Apache Commons RNG: Random Numbers Generators
Commons RNG provides implementations of pseudo-random numbers generators that are
faster; of higher quality; and/or of a longer period than
java.util.Random
and
java.util.SplittableRandom
Casual use is as simple as:
import org.apache.commons.rng.UniformRandomProvider;
import org.apache.commons.rng.simple.RandomSource;
// Instantiate a generator with a factory method.
UniformRandomProvider rng = RandomSource.XO_RO_SHI_RO_128_PP.create();
// Use it to produce a floating-point value between 0 and 1.
double random = rng.nextDouble();
For more examples and more advanced usage, see the
userguide
Commons RNG is intended to be a repository of pure Java implementations of
random number generators that produce deterministic sequences.
The current design has made no provision for features generally needed for
cryptography applications (e.g. strong unpredictability).
The emphasis is on state-of-the-art generators that pass stringent uniformity
tests such as
TestU01 (BigCrush)
Dieharder
and
PractRand
Weaker algorithms, with known shortcomings, are also provided (for reference or
due to their historical importance) but their use is best avoided in new
applications.
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