This book INTERNET and JAVA is written to serve as a text book for MCA III and patially for IVth Semester students. There are no prerequisites beyond a general familiarity with the ideas of computers and programs. There is enough material for a full semester of college-level programming.INTERNET and JAVA, covers all features of object oriented programming such as object, classes, inheritance and polymorphism. In this edition we try to cover the feature of Java. Therefore we have covered new feature of Java5 such as Boxing, enchanced for-loop, object class, instanceof operator and etc.This book also cover the advance features of Java such as Java applet, Java Beans, Java Swings and JDBC. In each chapter, sufficient worked examples have been given. At the end of each chapter, solved problems and programs have been given for the practice.Wherever necessary, concepts are given in boxes to facilitate easy grasping and better understanding.We have also given Two appendix in last, where Appendix A provides the latest question for interview and Appendix B gives the top ten tips for programming in Java. The author will feel highly obliged to all readers for their constructive suggestions healthy criticism of the book which will go a long way in the improvement of the text.