Functional Java

Pragmatic Bookshelf

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

O'Reilly

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

Independently published

Learn Functional Programming The Fast Way!: A former Java/OOP instructor teaches FP in the fastest way he knows

O'Reilly UK Ltd.

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

O'Reilly

Java 8 Lambdas                                  

Independently published

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

ThoughtFlow Solutions inc.

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

O'Reilly

Functional Thinking                              

O'Reilly

Functional Programming for Java Developers      

Functional Programming in JavaScript: Building Reliable, Reusable, and Scalable Applications with Functional Paradigms (English Edition)