Packages - Installing
A .jar file is basically a .zip file plus a little extra information. This file may contain one or more packages, and all the classes in them. If it knows where to find the ..
Packages - Defining
Packages correspond to directories in the file system..
Packages - Importing
Multiple classes of larger programs are usually grouped together into a package..
Directories and Files
Put all source files into a directory, one class per file.
CLASSPATH tells Java where to search for programs..