7.1. Packages
We will begin with packages for three reasons. First, they should be somewhat familiar at this point because they have been mentioned previously. Second, working with packages is very straightforward. Finally, we will use packages to organize much of the remainder of our work, so understanding how they are used is necessary.
Applications are organized into packages, the fundamental organizational unit in Java. A package is simply a directory, itself composed of Java classes, interfaces, and other packages.
Use packages in a manner similar to how you use directories for storing files on your computer. Package names are hierarchical, corresponding to physical directories on your hard drive. You may create as few or as many packages ...
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