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Annotations may be used on package declarations, with the restriction that at most one annotated package declaration is permitted for a given package
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The manner in which this restriction is enforced must, of necessity, vary from implementation to implementation The following scheme is strongly recommended for le-systembased implementations: The sole annotated package declaration, if it exists, is placed in a source le called package-infojava in the directory containing the source les for the package This le does not contain the source for a class called package-infojava; indeed it would be illegal for it to do so, as package-info is not a legal identi er Typically packageinfojava contains only a package declaration, preceded immediately by the annotations
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on the package While the le could technically contain the source code for one or more package-private classes, it would be very bad form It is recommended that package-infojava, if it is present, take the place of packagehtml for javadoc and other similar documentation generation systems If this le is present, the documentation generation tool should look for the package documentation comment immediately preceding the (possibly annotated) package declaration in packageinfojava In this way, package-infojava becomes the sole repository for package level annotations and documentation If, in future, it becomes desirable to add any other package-level information, this le should prove a convenient home for this information
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742 Unnamed Packages
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class FirstCall { public static void main(String[] args) { Systemoutprintln("Mr Watson, come here " + "I want you"); } }
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de nes a very simple compilation unit as part of an unnamed package An implementation of the Java platform must support at least one unnamed package; it may support more than one unnamed package but is not required to do so Which compilation units are in each unnamed package is determined by the host system In implementations of the Java platform that use a hierarchical le system for storing packages, one typical strategy is to associate an unnamed package with each directory; only one unnamed package is observable at a time, namely the one that is associated with the current working directory The precise meaning of current working directory depends on the host system Unnamed packages are provided by the Java platform principally for convenience when developing small or temporary applications or when just beginning development
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A compilation unit that has no package declaration is part of an unnamed package Note that an unnamed package cannot have subpackages, since the syntax of a package declaration always includes a reference to a named top level package As an example, the compilation unit:
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Observability of a Package
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743 Observability of a Package A package is observable if and only if either: A compilation unit containing a declaration of the package is observable A subpackage of the package is observable One can conclude from the rule above and from the requirements on observable compilation units, that the packages java, javalang, and javaio are always observable 744 Scope of a Package Declaration
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The scope of the declaration of an observable ( 743) top level package is all observable compilation units ( 73) The declaration of a package that is not observable is never in scope Subpackage declarations are never in scope It follows that the package java is always in scope ( 63) Package declarations never shadow other declarations
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75 Import Declarations
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An import declaration allows a static member or a named type to be referred to by a simple name ( 62) that consists of a single identi er Without the use of an appropriate import declaration, the only way to refer to a type declared in another package, or a static member of another type, is to use a fully quali ed name ( 67) ImportDeclaration: SingleTypeImportDeclaration TypeImportOnDemandDeclaration SingleStaticImportDeclaration StaticImportOnDemandDeclaration
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A single-type-import declaration ( 751) imports a single named type, by mentioning its canonical name ( 67) A type-import-on-demand declaration ( 752) imports all the accessible ( 66) types of a named type or package as needed It is a compile time error to import a type from the unnamed package A single static import declaration ( 753) imports all accessible static members with a given name from a type, by giving its canonical name
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