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Thread Life Cycle in Java

Life cycle of Thread tells the various information of thread form born to terminate. Thread life cycle contains the several stages and at a time any thread can be present  in a single state.

States of Thread life cycle

  1. Born
  2. Ready
  3. Running
  4. Blocked
  5. Sleep
  6. Wait
  7. Dead
Java Thread Life Cycle
Java Thread Life Cycle

Ready:  In this state thread is ready to execute but not running. 

When the start() method calls thread enters from born to ready state.

Running:  When a run() method executes highest priority ready thread assigned a processor and enter in a running state for execution.

Thread can visit more than ones in a running state.

Blocked: When a running thread has a input-output issue it enters in a blocked state from running state and when input-output issue solves it again comes in a running thread.

Sleep : A running thread enter in a sleep state for a specified number of milliseconds when a sleep() method calls.

When sleep time expires then thread moves to ready state.

Wait : When a low priority thread executing and high priority thread comes then high priority thread get preference and enter in a running state. Then low priority thread leaves a running state and moves to wait state for indefinite time.

When a high priority thread execution completes it calls waiting thread for execution by notify () & notifyall () method.

Dead: A running thread is enter in a dead state when its execution completes (run() method completes)   or terminate for any reason.

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