References:

 Fundamentals of Computing:

• How to solve it by Computer, Dromey
• Structured Programming, O J Dahl, E W Dijkstra, C A R Hoare
• The Science of Programming, David Gries
• A Short Introduction to the Art of Programming, E W Dijkstra

Programming Language Java:

• Java Elements: Principles of Programming in Java, D A Bailey and D W Bailey, Tata McGraw Hill
• Java for Scientists and Engineers, Sanjeev Saxena, Anamaya Publishers, New Delhi, 2008
• Thinking in Java by Bruce Eckel. E-copy of the 3rd edition is available here.
• Javanotes by David J. Eck (eck@hws.edu). This is a free book available for download here.
• The Java Programming Language, 2nd Edition by Ken Arnold, James Gosling
• Java2: A Beginner�s Guide, Herbert Schildt, Tata McGraw Hill
• Computing Concepts with Java2 Essentials, Cay Horstmann, John Wiley
• Core Java2, Vol 1 (fundamentals), Cay Horstmann, Pearson
• Core Java2, Vol 2 (advanced), Cay Horstmann, Pearson
• Simply Java: An Introduction to Java Programming (Programming Series) by James Levenick.

 Data Structures:

• Data Structures and Algorithms in Java, Goodrich, John Wiley
• Data Structures in Java, Thomas A Standish

 Java API

• Java API Documentation, Sun Microsystems

 Numerical Analysis:

• Advanced Engineering Mathematics, Erwin Kreyszig

Java Classes:

• http://java.sun.com/j2se/1.3/docs/api/java/lang/String.html
• http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Math.html
• http://java.sun.com/docs/books/tutorial/essential/

 Hexadecimal Numbers:

• http://en.wikipedia.org/wiki/Hexadecimal
• http://www.danbbs.dk/~erikoest/hex.htm

Online Books/Tutorials:

• Java Tutorial by Sun Micro Systems
• The Java Language Specification 2nd Ed. by James Gosling, Bill Joy, Guy Steele, Gilad Bracha, Apr. 2000.