Why a single .java file can't have multiple public classes defined in it?

A public class must be saved in a .java file with the same name, why?

Tejaswi.Khijwania wrote:
A public class must be saved in a .java file with the same name, why?This is what the JLS states (7.6 Top Level Type Declarations),
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.
As you can see a host system (development system) may enforce this restriction. It doesn't have to.

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Message was edited by:
Abhishek Jolly

Why a single .java file can't have multiple public classes defined in it?

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