file name same as public class

[Anonymous]

i have already posted this problem to you but none had replied to me,so i am posting it again.
Why is the file name to be kept same as the public class although if it doesn't contain the main() method?

[bante]

It's a rule.

[Anonymous]

I also know that it is a rule.But what's the reason behind making this a rule?

[Anonymous]

Hi,
Yes, I was wondering why that is assumed to be a rule in Java. I still dont figured it out but I'm posting a tip i read from a java book.
"although only required for public classes," defining the same name as the file name "helps the compiler find NewClass, even if NewClass has not been compiled yet"
so my guess is maybe it has to do with the java compiler.
Can some java experts give more concrete reason behind it? just for the sake of curiosity..