What is the diff'ce while creating a thread

Question

what is the difference while creating thread using extends Thread, and implements Runnable interface. which one is perform better.

Answer 1

and for when to use which again depends upon if the
e class that you wish to make threaded already
extends from some other class. If so is the case the
only alternative you are left with is to implement it
from Runnable interface. ( as java does not supports
multiple inheritance ).That's a bad advice. You should only extend thread if you actually want to change the behaviour, or extend the functionallity of the thread class. You should not extend the thread class just because it's convinient.
/Kaj