Reading
Chapter 4
Section 8

Organizing Classes into a Package
- within a class, you can refer to other classes if they are in the same folder as the current class
- to view other classes outside the current folder, must place those classes into a package
- Java naming convention uses all lowercase letters for packages
- use your own classes just like the standard ones by importing the corresponding packages
- steps to set up programmer-defined packages for general reuse
  - define the package in the first statement of the source file
    package <package name>;
  - declare class with the visibility modifier public
    public class <class name> {
    ...
    }
  - create a folder with the same name as the package (Java requires a one-to-one correspondence between packages and folders)
  - place the modified class into this folder and compile
  - modify the CLASSPATH environment variable to include this folder
    - how to do varies with
      - platform
      - development tool
    - will provide more details if required for course work