This book is intended for two audiences. The first, which motivated us to write it in the first place, consists of students in undergraduate or graduate courses in computer networks. The second consists of practitioners who know something about Java and want to learn about writing Java applications that use the Internet. We have tried to keep the book concise and focused, so it can be used by students as a supplementary text and by practitioners as a lowcost introduction to the subject. As a result, you should not expect to be an expert after reading this book! The goal is to take users far enough that they can start experimenting and learning on their own. Readers are assumed to have access to a computer equipped with Java. This book is based on Version 1.6 of Java and the Java Virtual Machine (JVM); however, the code should work with earlier versions of Java, with the exception of a few new Java methods. Java is about portability, so the particular hardware and operating system (OS) on which you run should not matter.
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