A Java source code file takes the name of a public class or interface that is defined within the file. A source code file may contain at most one public class or interface. If a public class or interface is defined within a source code file, then the source code file must take the name of the public class or interface. If no public class or interface is defined within asource code file, then the file must take on a name that is different than its classes and interfaces. Source code files use the .java extension.

if class is declared as public then source code file name must be same as class name.oterwise it will give compile time error.if class is no access specifier then file name may be same or different.A class can never be declared private/protected

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