How interrupting a thread works ?

Thread provides :

• A boolean flag : which holds interrupted status
• interrupt method : for interrupting a thread and for querying whether a thread has been interrupted.
  Interrupting a thread sets the interrupted status.

When thread A interrupts thread B, A is like requesting that B stop what it is doing when it gets to a convenient stopping point

Handling interruption
You must have a plan for responding to interruption :

• Propagate the InterruptedException
  OR
• Restore the interrupt : Catch InterruptedException and restore the interrupted status by calling interrupt on the current thread.