What is the difference between start() and run() method of Thread class ?

Difference between start() and run() method of Thread class ? 

When we invoke start() method a newly created thread is started, while start() internally calls run() method. 

Declaration of start() method : 

public void start() .

It is never legal to start a thread more than once. In particular, a thread may not be restarted once it has completed execution.

When we invoke run() method, its called in the same thread, no new thread is started. 

Declaration of run() method :

public void run()

      

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