-- Gary McGraw, PhD, Research Scientist at Reliable Software Technologies and coauthor of "Java Security"

" This is a book of 'why' not 'how.' If you are interested in the nature of computation and curious about the very idea behind object orientation, this book is for you. This book will engage your brain (if not your tummy). Through its sparkling interactive style, you will learn about three essential OO concepts: interfaces, visitors, and factories. A refreshing change from the 'yet another Java book' phenomenon. Every serious Java programmer should own a copy." -- Gary McGraw, PhD, Research Scientist at Reliable Software Technologies and coauthor of "Java Security"

& quot; This is a book of 'why' not 'how.' If you are interested in the nature of computation and curious about the very idea behind object orientation, this book is for you. This book will engage your brain (if not your tummy). Through its sparkling interactive style, you will learn about three essential OO concepts: interfaces, visitors, and factories. A refreshing change from the 'yet another Java book' phenomenon. Every serious Java programmer should own a copy.& quot; -- Gary McGraw, PhD, Research Scientist at Reliable Software Technologies and coauthor of Java Security

"This is a book of 'why' not 'how.' If you are interested in the nature of computation and curious about the very idea behind object orientation, this book is for you. This book will engage your brain (if not your tummy). Through its sparkling interactive style, you will learn about three essential OO concepts: interfaces, visitors, and factories. A refreshing change from the 'yet another Java book' phenomenon. Every serious Java programmer should own a copy."--Gary McGraw, PhD, Research Scientist at Reliable Software Technologies and coauthor of "Java Security"

Matthias Felleisen is Trustee Professor of Computer Science at Northeastern University, recipient of the Karl V. Karlstrom Outstanding Educator Award, and co-author (with Daniel Friedman) of The Little Schemer and three other "Little" books published by the MIT Press.

Daniel P. Friedman is Professor of Computer Science at Indiana University and is the author of many books published by the MIT Press, including The Little Schemer (fourth edition, 1995), The Seasoned Schemer (1995), A Little Java, A Few Patterns (1997), each of these coauthored with Matthias Felleisen, and The Reasoned Schemer (2005), coauthored with William E. Byrd and Oleg Kiselyov.