You want to try out my example code and/or use my utility classes.
I have built up a fairly sizeable collection of reusable classes into my own API, which I use in my own Java projects. I use example code from it throughout this book, and I use classes from it in many of the other examples. So, if you're going to be downloading and compiling the examples individually, you should first download the file darwinsys.jar and include it in your CLASSPATH. Note that if you are going to build all of my source code (as in Recipe 1.6), you can skip this download because the top-level Ant file starts off by building the JAR file for this API.
I have split the com.darwinsys.util package from the first edition of this book into about a dozen com.darwinsys packages, listed in Table 1-1. I have also added many new classes; these packages now include approximately 50 classes and interfaces. You can peruse the documentation online at http://javacook.darwinsys.com/docs/api.
Many of these classes are used as examples in this book; just look for files whose first line is:
You'll also find that many examples have imports from the com.darwinsys packages.