To create a package, you choose a
name for the package (naming conventions are discussed in the next section) and
put a package statement with that name at the top of every source file
that contains the types (classes, interfaces, enumerations, and annotation
types) that you want to include in the package.
The package statement (for example, package
graphics;) must be the first line in the
source file. There can be only one package statement in each source file, and
it applies to all types in the file.
Note: If you put multiple types in a single source file,
only one can be public,
and it must have the same name as the source file. For example, you can define public
class Circle in the file Circle.java, define public interface
Draggable in the file Draggable.java, define public enum Day
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