Please indent your code correctly; your inconsistent indentation makes it difficult to read. Have you seen the circumstance in which this exception can occur in the InterruptedException documentation? It doesn't say anything about join(). Have you read about interruption in the Java™ Tutorials?
I shall move this thread as too difficult for "beginning".
Joined: May 12, 2011
This is actually part of a question that I have reconstructed from my memory. I am not sure I can quote the exact source. According to the solution, for "Interrupted" to be printed, t.join() had to be used.