java.util.concurrent · java.base · since Java 1.7

ThreadLocalRandom

declaration

public class ThreadLocalRandom extends Random

Per-thread random generator without contention: the default choice inside concurrent code and parallel streams. Access via current(), never share, never seed.

Key methods

`static ThreadLocalRandom current()`	The calling thread's generator — always call at use site.
`int nextInt(int origin, int bound)`	Range sampling.