java.util · java.base · since Java 1.0

Random

declaration

public class Random implements RandomGenerator, Serializable

Seedable pseudo-random generator — reproducible sequences for tests and simulations. For concurrent code use ThreadLocalRandom; for security use SecureRandom.

Key methods

`Random(long seed)`	Deterministic sequence — reproducible tests.
`int nextInt(int origin, int bound)`	Uniform in [origin, bound).
`IntStream ints(long size, int origin, int bound)`	Random streams.