Thread life cycle:
1. New: A new thread is created but not working. A thread after creation and before invocation of start() method will be in new state.
2. Runnable: A thread after invocation of start() method will be in runnable state. A thread in runnable state will be available for thread scheduler.
3. Running: A thread in execution after thread scheduler select it, it will be in running state.
4. Blocked: A thread which is alive but not in runnable or running state will be in blocked state. A thread can be in blocked state because of suspend(), sleep(), wait() methods or implicitly by JVM to perform I/O operations.
5. Dead: A thread after exiting from run() method will be in dead state. We can use stop() method to forcefully killed a thread.
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