From my web site http://javacook.darwinsys.com, just follow the Downloads link. You are presented with three choices:
Most people will choose either option 1 or 2, but anyone who wants to compile my code will need option 3. See Recipe 1.5 for information on using these files.
Downloading the entire source archive yields a large zip file with all the files from the book (and more). This archive can be unpacked with jar (see Recipe 23.4), the free zip program from Info-ZIP, the commercial WinZip or PKZIP, or any compatible tool. The files are organized into subdirectories by topic, with one for strings (Chapter 3), regular expressions (Chapter 4), numbers (Chapter 5), and so on. The archive also contains the index by name and index by chapter files from the download site, so you can easily find the files you need.
Downloading individual files is easy, too: simply follow the links either by file/subdirectory name or by chapter. Once you see the file you want in your browser, use File Save or the equivalent, or just copy and paste it from the browser into an editor or IDE.
The files are updated periodically, so if there are differences between what's printed in the book and what you get, be glad, for you'll have received the benefit of hindsight.