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Foil 28 Using Java packages

From Jan 27 Delivered Lecture for Course CPS616 -- Java Lecture 2 -- Basic Applets and Objects CPS616 spring 1997 -- Jan 27 1997. by Nancy McCracken * See also color IMAGE
Secs 18.7
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
  • 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.
Northeast Parallel Architectures Center, Syracuse University, npac@npac.syr.edu

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