Can we changed the Java main method during program execution ?

Answer 1

I'm not sure if that can be done but you can always overload the main method but you cannot override it.

Answer 2

I doubt how can any method can be changed during execution..?
We write methods to manipulate on data, not on methods...!? So execution happens depending on methods...
Edit: Am I missing anything about question?..
Am not able to understand the question fully..
Are you taking about overriding?