What's new in Java 8: Lambdas – O'Reilly

A hands-on introduction to Java 8

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Mastering Java 8 Essential Key Features

10 Best Java Tutorials, Courses, and Books to learn Lambda Expression and Stream API, and Functional Programming, by javinpaul, Javarevisited

Functional Programming in Java, 2nd Edition [Book]

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Java 8 Lambdas: Functional Programming For The Masses

Modern Java Recipes [Book]

Functional Programming in Java: Harness the Power of Streams and Lambda Expressions : Subramaniam, Venkat: : Books

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Java 8 Lambdas: Pragmatic Functional Programming : Warburton, Richard: : Books

Lambdas: Myths and Mistakes