Functional Programming in Java [closed]

Answer 1

Jambda is another FP-library. From the documentation:

Jambda is an attempt to provide the Java(TM) world with tools and concepts from functional programming (FP).

The goals are several:

• To provide Java programmers with expressive FP constructs
• To provide a bridge for Java programmers into the FP-world
• To see how far Java and generics can be stretched

This document is an attempt to introduce Java programmers into the FP world, and at the same time explain some (or most) of the features in Jambda.

Answer 2

Although Functional Java is the most popular but i'll suggest you to try Google guava lib.

http://code.google.com/p/guava-libraries/

Answer 3

Google collections has a decent selection of functional-programming style utility methods. Some classes of interest are Iterables, Iterators, Function, Functions, etc

It also has a bunch of collection classes as well!

Answer 4

Functional Java is one that's worth taking a look at and FunctionalJ is another.

Answer 5

Apache Commons has some functional-ish code in it. See for example, the Predicate interface.

Answer 6

Or download OpenJDK 8 to try out Lambda expressions the way they will become in Java 8. Among others, the collection APIs are adjusted to support a functional style. See http://macgyverdev.blogspot.se/2012/10/functional-programming-in-java.html for examples of new collection APIs and comparisons with Guava, LambdaJ and FunctionalJava.