7.3. Compilation Units
CompilationUnit is the goal symbol (§2.1) for the syntactic grammar (§2.3) of Java programs. It is defined by the following productions:
CompilationUnit: PackageDeclarationopt ImportDeclarationsopt TypeDeclarationsoptImportDeclarations: ImportDeclaration ImportDeclarations ImportDeclarationTypeDeclarations: TypeDeclaration TypeDeclarations TypeDeclaration
A compilation unit consists of three parts, each of which is optional:
• A package declaration (§7.4), giving the fully qualified name (§6.7) of the package to which the compilation unit belongs.
A compilation unit that has no package declaration is part of an unnamed package (§7.4.2).
• import declarations (§7.5) that allow types from other packages and ...
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