java.util.concurrent · java.base · since Java 1.5

Executors

declaration

public class Executors

Factory methods for standard executor configurations — fixed pools, scheduled pools, single-thread serializers, and the Java 21 virtual-thread-per-task executor.

Key methods

`static ExecutorService newFixedThreadPool(int n)`	N threads, UNBOUNDED queue — mind overload behavior.
`static ExecutorService newVirtualThreadPerTaskExecutor()`	One cheap virtual thread per task (Java 21) — the I/O-workload default.
`static ScheduledExecutorService newScheduledThreadPool(int n)`	Delayed and periodic tasks.
`static ExecutorService newSingleThreadExecutor()`	Serialized execution — an actor-lite.
`static ExecutorService newCachedThreadPool()`	Unbounded thread growth — dangerous under load; largely superseded.