This programming guide does three things. It
The first section, Getting Started with AspectJ, provides a gentle overview of writing AspectJ programs. It also shows how one can introduce AspectJ into an existing development effort in stages, reducing the associated risk. You should read this section if this is your first exposure to AspectJ and you want to get a sense of what AspectJ is all about.
The second section, The AspectJ Language, covers the features of the language in more detail, using code snippets as examples. All the basics of the language is covered, and after reading this section, you should be able to use the language correctly.
The next section, Examples, comprises a set of complete programs that not only show the features being used, but also try to illustrate recommended practice. You should read this section after you are familiar with the elements of AspectJ.
The back matter contains several appendices that cover a AspectJ Quick Reference to the language's syntax, a more in depth coverage of its Semantics, and a description of the latitude enjoyed by its Implementation Notes.