As we are all know that computer is important for each and every field of the subjects. Keeping in this mind, authors have written the questions and answers on Java features, Classes and Objects, Interfaces, Packages, Threads, Exceptions, Applets, Files and Network Programming. These topics shall help to Java learners who can be helped to write a programme in their subject areas. Example, in business, there are accounting, finance, co-operative, auditing, management, commerce, supply chain management, public administration, economics and banking subjects are involved. If they would like to computerize the system or the problems of the these subjects using Java, this book shall help them to learn Java and computerize the as they like. The intention of the authors is to clear the doubts through raising questions in Java which can also be helped to learn Java. Any comments, clarification and suggestions would be welcomed through the email address of [email protected].