No es estandar de java, es unas clasecillas que se hizo el autor del libro para sus ejemplos. Supongo que en el libro o en la página web del autor te dirán donde puedes descargarlas.
Esto creo que es del libro y hace referencia a eso
Cita: In order to use this library, you must download this book’s code package from
www.MindView.net or one of its mirrors. Unzip the code tree and add the root directory of that code tree to your computer’s CLASSPATH environment variable. (You’ll eventually get a full introduction to the classpath, but you might as well get used to struggling with it early. Alas, it is one of the more common battles you will have with Java.)
Although the use of net.mindview.util.Print nicely simplifies most code, it is not justifiable everywhere. If there are only a small number of print statements in a program, I forego the import and write out the full System.out.println( ).
Se bueno.