The required knowledge to start studying this book is an abstract thinking skills! For example; if you understand Math and Physics, you can learn Java using this book.
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SarMaroof.com offers a practical method to learn and improve your Java skills. It avoids unnecessary long boring theoretical explanations, but it uses many exercises and quizzes.
Sar Maroof is graduated from HBO Amsterdam "higher professional education". He is a professional computer programming teacher, gives master classes and publishes technical articles. His experience with developing software started from 2001 and he has worked as a software developer for several big as well as small companies and later as a freelancer.
He is the author of Java quizmaster and Build a Java application in 7 days.