Java Functional

Pragmatic Bookshelf

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

O'Reilly UK Ltd.

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

ThoughtFlow Solutions inc.

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

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

O'Reilly Media

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

Independently published

Java Functional Programming Made Simple: A Practical Guide with Examples

Independently published

JAVA: A Functional Approach                      

Java Functional Programming :Play with Stream and Lambda with industry best practices (Java programming :from ZERO to HERO) (English Edition)

Manning Publications

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

Java Functional Programming - Lambda & Stream Practice Tests: 180+ questions on Inner classes, Lambda expressions, Method References, Functional Interfaces & Stream API (English Edition)