Programming in JAVAis designed to serve as a textbook for undergraduate students of computer science and engineering and computer applications. The book covers the concepts of Object Oriented Programming before commencing with the fundamentals of JAVA. The reasons behind evolution of JAVA and the reasons for the replacement of C++ by JAVA as an Object Oriented Programming are also discussed. It includes topics such as Java Sockets, Applets, Swings, and Java Collections and Iterators. The book also encompasses all the modifications and enhancements related to JAVA 5.0 and JAVA 6. Numerous programming exercises are interspersed in the chapters for the better understanding of concepts. Besides having detailed exercises at the end of each chapter, the book has some key review questions along with their answers at the end, which could be helpful to the readers in revising the concepts learnt.