Question

If a method throws NullPointerException in super class, can we override it with a method which throws RuntimeException?

Answer 1

Are you saying you want to catch the one exception and generate a different one?

Answer 2

That should be possible as NullPointerException implements RuntimeException.

Example:
http://ideone.com/94r0Xd

Javdoc:
http://docs.oracle.com/javase/7/docs/api/java/lang/NullPointerException.html