HELP! * GREY=local LOCAL HTML version of Foils prepared July 10 1996

Foil 93 Using packages

From Basic Lectures on Java Language Applets Graphics Networking Trip to China and Icase Tutorial -- July 12-28 and June 10-13 96. by Geoffrey C. Fox * See also color IMAGE

One 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
  • Without 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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