Functional Java

Pragmatic Bookshelf

Functional Programming in Java: Harness the Power of Streams and Lambda Expressions

ThoughtFlow Solutions inc.

Functional Java: A Guide to Lambdas and Functional Programming in Java 8 (English Edition)

O'Reilly Media

A Functional Approach to Java: Augmenting Object-Oriented Java Code with Functional Principles (English Edition)

Java Streams and Lambdas: Functional Programming Techniques in Java (English Edition)

Addison-Wesley Professional

Effective Java (English Edition)                

Packt Publishing

Learning Java Functional Programming (English Edition)

Manning

Functional Programming in Java: How functional techniques improve your Java programs (English Edition)

O'Reilly Media

Java 8 Lambdas: Pragmatic Functional Programming (English Edition)

Java 8 Functional Programming(Chinese Edition)  

Functional Interfaces in Java: Fundamentals and Examples