Java Functional

Pragmatic Bookshelf

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

O'Reilly Media

A Functional Approach to Java: Augmenting Object-Oriented Java Code with Functional Principles

O'Reilly UK Ltd.

Functional Programming in Java: Harnessing the Power of Java 8 Lambda Expressions

Independently published

Functional Programming with Java: An In-Depth Exploration and Implementation Guide

Manning Publications

Java 8 in Action: Lambdas, Streams, and functional-style programming

Manning Publications

Functional Programming in Java: How functional techniques improve your Java programs

O'Reilly Media

Java 8 Lambdas                                  

Packt Publishing

Learning Java Functional Programming            

Java Functional Programming: Hands-On (Complete Java course : from ZERO to professional) (English Edition)

O'Reilly Media

Functional Programming for Java Developers