Creating Packages

1
Creating Packages
2
CLASSPATH

• Set the CLASSPATH environment variable
• Directs the Java Class Loader to begin search at
  the directory that contains the package directory
  structure
• My package directory structure is located in
• /home/winnt/GONZAGA/depalma/public_html/courses/cp
  sc324/packages
• in .profile of my home directory, I have
• CLASSPATH/home/home/winnt/GONZAGA/depalma/public
  _html/courses/cpsc324/packages

3
Package Directory Structure

• By Convention, the package directory structure is
  your server name followed by the name of the
  package
• So, I have a package called containers
• located at CLASSPATH/edu/gonzaga/cs/containers

4
Creating the structure

• Beginning with the lowest level class member in
  the package
• Make this the first
• package ltpackage directory structuregt
• In my case, this is
• package edu.gonzaga.cs.containers
• 2. Compile with the d option
• javac d . ltPgmNamegt.java
• The first compilation creates the directory
  structure and places the class file for PgmName
  at the bottom. Subsequent compilations just place
  the class file for PgmName at the bottom

5
Using A Package

• Put this line at the top of each program that
  uses a class in the container
• Import ltpackage directory structuregt.ltclassNamegt
  
• Suppose I want to use List.class
• import edu.gonzaga.cs.containers.List