Basic HTML version of Foils prepared Sept 21 1998

Foil 41 Using Java packages

From Java Tutorial 98- 2: Java Language and Object Oriented Techniques NAVO Tutorial -- Sept 23 1998. by Geoffrey C. Fox, Nancy McCracken


One conveniently uses files in a package by inserting
  • import mill.*
at the beginning of a file that needs classes from the mill package
  • Then classes in the mill package can be refered to by just using their Classname
  • ithout the import command, one must explicitly say mill.Classname
Packages can be grouped hierarchically, with the corresponding directory tree. For example, the mill package could be a subpackage of agriculture. Then a class is referred to as agriculture.mill.Classname.
Except for classes provided with the Java language, all of which have the form java.X, a class that is imported or used must either be in the current directory or be accessible to the compiler through the CLASSPATH environment variable.



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