Can there exist two main methods in a Java program?
Only by the difference in their arguments like:
public static void main(String[] args)
As long as method parameters (number (or) type) are different, yes they can. It is called overloading.
Overloaded methods are differentiated by the number and the type of the arguments passed into the method
public static void main(String[] args)
only main method with single String[]
(or) String...
as param will be considered as entry point for the program.