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A Java compilation unit is defined in the Java Language Specification as:

CompilationUnit :
   PackageDeclarationopt ImportDeclarationsopt TypeDeclarationsopt

TypeDeclarations :
   TypeDeclaration
   TypeDeclarations TypeDeclaration

TypeDeclaration :
   ClassDeclaration
   InterfaceDeclaration

The above means that a Java compilation unit consists of:

• Optionally, a package declaration, followed by
• Optionally, a set of one or more import declarations, followed by
• Optionally, a set of one or more type declarations, each type declaration may comprise:
  • A class declaration, or 
  • An interface declaration (more about interfaces, soon)

This page was last modified on 02 October, 2007