What is a Thread?
Thread is a lightweight sub-process, a smallest unit of
processing.
Thread Class contains run() method, which has
the actual work to be performed by thread.
Life cycle of a thread
The life cycle of the thread contains following 5 stages:
1.
New
2.
Runnable
3.
Running
4.
Non-Runnable (Blocked)
5.
Terminated
1) New
|
The thread is in new state if you create an instance of
Thread class but before the invocation of start() method.
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2) Runnable
After invocation of start() method, but the thread
scheduler has not yet selected it to run.
3) Running
When the thread scheduler has selected the thread, the
thread is in running state .
4) Non-Runnable (Blocked)
When the thread is alive, but is currently not eligible
to run, it is in blocked state
5) Terminated
When its run() method exits the thread attains
terminated or dead state
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