java.lang · java.base · since Java 1.0

Thread

declaration

public class Thread implements Runnable

A thread of execution. Modern creation goes through Thread.ofPlatform()/ofVirtual() builders or executors; interruption is the cooperative cancellation protocol.

Key methods

`void start()`	Begins execution on a new thread (run() would execute on YOUR thread).
`void interrupt() / boolean isInterrupted()`	Request and check cooperative cancellation.
`void join() / join(millis)`	Wait for termination.
`static void sleep(long millis)`	Park (holding any locks!); throws InterruptedException.
`static Thread currentThread()`	The executing thread.
`static Builder.OfVirtual ofVirtual() / OfPlatform ofPlatform()`	Java 21 builders — name, daemon status, start.
`Thread.State getState()`	NEW/RUNNABLE/BLOCKED/WAITING/TIMED_WAITING/TERMINATED.
`void setUncaughtExceptionHandler(…)`	Last-chance logging for dying threads.