Actually In java The Filename should match with the Public class inside that filename, Not with the class which has main method.
This is a requirement of the Java reference compiler released by Sun.
And this is the reason what I found on SDN network, which says
it's in the JLS. Section 7.6:
"When packages are stored in a file system (�7.2.1), the host system may choose to enforce the restriction that it is a compile-time error if a type is not found in a file under a name composed of the type name plus an extension (such as .java or .jav) if either of the following is true:
* The type is referred to by code in other compilation units of the package in which the type is declared.
* The type is declared public (and therefore is potentially accessible from code in other packages).
This restriction implies that there must be at most one such type per compilation
unit. This restriction makes it easy for a compiler for the Java programming language or an implementation of the Java virtual machine to find a named class within a package; for example, the source code for a public type wet.sprocket.Toad would be found in a file Toad.java in the directory wet/sprocket, and the corresponding object code would be found in the file Toad.class in the same directory."
[ June 11, 2007: Message edited by: prateek chaudhari ]