See more basics of thread in java here : What is thread in java ? The different states while thread is in runnable states are given below : Sleeping States : may be alive, but not running may return to runnable state stop running for an amount of time Waiting for Notifications : wait for notification from other send to runnable after notified thread Blocked on I/O : after availability of resource sends to runnable Blocked for Joint Completion : waiting for completion of another thread Blocked for Lock Acquistion : Come to this state because of waiting to acquire the lock of an object.
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