RUNNING: Accept new tasks and process queued tasks SHUTDOWN: Don't accept new tasks, but process queued tasks STOP: Don't accept new tasks, don't process queued tasks, and interrupt in-progress tasks TIDYING: All tasks have terminated, workerCount is zero, the thread transitioning to state TIDYING will run the terminated() hook method TERMINATED: terminated() has completed private static final int COUNT_BITS = Integer.SIZE - 3; // runState is stored in the high-order bits private static final int RUNNING = -1 << COUNT_BITS; private static final int SHUTDOWN = 0 << COUNT_BITS; private static final int STOP = 1 << COUNT_BITS; private static final int TIDYING = 2 << COUNT_BITS; private static final int TERMINATED = 3 << COUNT_BITS;
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