I often receive emails and queries asking about some good books to learn Java 8. Since Java 8 is very different from any other JDK release, in terms of language and API enhancement you really need a good book to learn fundamentals. In short, based upon my 2 years of learning and reading Java 8 books, I can say that Java SE 8 for Really Impatient is hands down the best book to learn Java 8. It covers all the essential things released in JDK 8, not just lambda expression and streams but also new Date and Time API and several other minor enhancement yet important features, which often goes un-noticed. It doesn't scare you with comprehensive detail as well and tell you what you need to know as an application developer. It's not going to teach you fundamentals of functional programming, but it will teach you how to use the map and flatMap operations.
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