Re: Can more than one enum be stored in a file?

Joshua Cranmer <>
Sun, 08 Apr 2007 18:10:36 GMT
jt wrote:

    A Java source code file can contain more than one class,
but only one of the classes can be declared to be public. A
class can contain no public classes at all if desired,
although this isn't possible with applets because of the
rules of inheritance.

    If a source code file contains a class that has been declared to
be public, the name of the file must match the name of that
class. For example, the source code for a public class
called BuyItem must be stored in a file called


Said site is copyrighted in 2003, before Java 5 came along (JLS 3 was
published in 2005).

Re JLS3 ?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 [ClassDeclaration or InterfaceDeclaration] 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 [file].

Re JLS3 ?8.1:

Here, NormalClassDeclaration is what is meant by 'class' and
EnumDeclaration refers to 'enum's. Thus the term 'enum' can, for the
most part, also be used wherever the term 'class' is generally used.

In the text you cited, class is a generic term referring to the
ClassOrInterfaceDeclaration -- so it refers to classes, interfaces,
annotations, and enums in general.

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