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Learn Java Functional Programming with Lambdas & Streams (Udemy.com)

Learn Java Functional Programming with Lambdas & Streams. Learn the most powerful NEW feature in Java 8 and Java 9.

Created by: in28Minutes Official

Last updated April 2025

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What you will learn

  • You will learn to write great Java code with Functional Programming
  • You will solve a number of Java Puzzles and Exerices using Functional Programming
  • You will learn the Fundamentals of Functional Programming - Lambda Expressions, Method References, Streams and Functional Interfaces
  • You will learn about intermediate and terminal Stream operations - map, reduce, forEach, filter, distinct, sorted
  • You will learn about a variety of Functional Interfaces - Predicate, Consumer, Supplier, BinaryOperator and Function
  • You will learn to simplify your Java code to play with List and Map using Functional Programming
  • You will learn to play with Java Files and Threads using Functional Programming
  • You will learn some fundamentals of Functional Programming - Behavior Parameterization and Higher Order Functions
  • You will Join 300,000 Learners having AMAZING LEARNING Experiences with in28Minutes

How it compares

Against the other 231 rated Udemy courses in Java on CourseDuck:

  • Rating4.6 out of 5higher than 71% of them
  • Reviews11,370#23 of 232 by number of reviews
  • Length6.4 hoursshorter than 65% of them
  • Last updatedApril 2025more recently than 63% of them

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Course Description

Functional Programming is an essential skill for Java Programmers today.

Wanna start playing with Functional Programming in Java and Learn Streams and Lambdas?

Want to write awesome Java code with Functional Programming using Streams, Lambda Expressions, Functional Interfaces, and Method References?


WHAT STUDENTS ARE SAYING:

5 STARS - Great course to understand functional programming in Java. As usual, Ranga provides very clear explanations and examples to apply what you learn. 100% recommended

5 STARS - This course covers lot of methods, functional interfaces etc. It could have gone monotonous, but the instructor keeps the course engaging, and by using puzzles in jshell the course remains interesting till end.

5 STARS - Great course on function programming, started my journey on functional programming with this course.

5 STARS - Really good course. If you are looking out to get good knowledge on Functional Programming, then this course is waiting for you :)

5 STARS - Great teacher and Great Course...Ranga know how to start from beginner to Master...Good course!

5 STARS - Good examples how we used to write code and how to do it with functional programming. The course builds knowledge in such simple steps that it is effortless to learn

5 STARS - Ranga's small but powerful building code approach helped me to develop the thinking. When he says pause the video and try please do so that way I learned a lot. I was feeling like I was doing Pair programming with Ranga. Thank you Ranga. I have most of your courses this is the second one I completed. A big Thank you.



Want to make your Java Programs more performant and parallelizable using Functional Programming?

Are you ready to learn the most awesome new feature introduced into Java in Java 8 and Java 9?

Are you ready to learn about Functional Programming and take the next step in your programming career?

Do you want to join 500,000+ learners having Amazing Learning Experiences with in28Minutes?

Look No Further!


FUNCTIONAL PROGRAMMING COURSE OVERVIEW

Functional Programming was introduced into Java in Java 8. Additional Functional Programming Enhancements were introduced in Java 9.

In this hands-on course, we will learn to write an amazing Java code with Functional Programming. You will learn the basics of Java Functional Programming - Lambda Expressions, Method References, Streams, and Functional Interfaces.

This course would be a perfect first step as an introduction to Functional Programming with Java.

You will be using Eclipse (Java IDE) in this course. We will help you set up each one of these.


Start Learning Now. Hit the Enroll Button!


COURSE HIGHLIGHTS

Introduction to the Course

  • Step 01: Functional Programming with Java - Course Overview

  • Step 02: Functional Programming with Java - Exploring Github Repo and Installations

Introduction to Functional Programming with Java

  • Step 01: Getting Started with Functional Programming with Java

  • Step 02: Writing Your First Java Functional Program

  • Step 03: Improving Java Functional Program with filter

  • Step 04: Using Lambda Expression to enhance your Functional Program

  • Step 05: Do Functional Programming Exercises with Streams, Filters and Lambdas

  • Step 06: Using map in Functional Programs - with Exercises

  • Step 07: Quick Review of Functional Programming Basics

Playing with Streams

  • Step 01: Learning Stream Operations - Calculate Sum using reduce

  • Step 02: Playing with reduce

  • Step 03: Exploring Streams with Puzzles in JShell

  • Step 04: Do Functional Programming Exercises with Streams and reduce

  • Step 05: Learn Stream Operations - distinct and sorted

  • Step 06: Using Comparators to Sort Streams with sorted

  • Step 07: Collecting Stream Elements to List using collect

  • Step 08: Reviewing Streams - Intermediate and Stream Operations

Exploring Java Functional Interfaces and Lambdas

  • Step 01: Getting Started with Functional Interfaces - Predicate, Consumer and Function

  • Step 02: Do Exercises with Functional Interfaces - BinaryOperator

  • Step 03: Doing Behavior Parameterization with Functional Programming

  • Step 04: Do Exercise with Behavior Parameterization

  • Step 05: Exploring Supplier and UnaryOperator Functional Interfaces

  • Step 06: Exploring BiPredicate, BiFunction, BiConsumer, and Primitive Functional Interfaces

  • Step 07: Playing Puzzles with Functional Interfaces and Lambdas

  • Step 08: Exploring Method References with Java

Java Functional Programming with Custom Classes

  • Step 01: Creating Custom Class Course with some Test Data

  • Step 02: Playing with allMatch, noneMatch and anyMatch

  • Step 03: Sorting courses with sorted and creating Comparators

  • Step 04: Playing with skip, limit, takeWhile and dropWhile

  • Step 05: Finding top, max and min courses with max, min, findFirst and findAny

  • Step 06: Playing with sum, average and count

  • Step 07: Grouping courses into Map using groupingBy

Playing with Java Functional Programming

  • Step 01: Creating Streams using Stream of method and for Arrays

  • Step 02: Creating Streams for First 100 Numbers, Squares of Numbers and More

  • Step 03: Doing Big Number calculations with BigInteger

Playing further with Java Functional Programming

  • Step 01: Joining Strings with joining and Playing with flapMap

  • Step 02: Creating Higher-Order Functions

  • Step 03: FP and Performance - Intermediate Stream Operations are Lazy

  • Step 04: Improving Performance with Parallelization of Streams

Functional Programming makes Java Easy

  • Step 01: Modifying lists with replaceAll and removeIf

  • Step 02: Playing with Files using Functional Programming

  • Step 03: Playing with Threads using Functional Programming

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Instructor Details

in28Minutes Official

Ranga Karanam, the founder of in28minutes, has 2 decades of experience with technology - architecture, design, and programming.  We are helping learners take their first steps into modern cloud native technology and gain expertise on AWS, Azure, Google Cloud, Docker, Kubernetes amongst others.

Our happiest moments are when learners tag us on LinkedIn or reach out to us with their stories of getting their first job, getting a promotion, or a big raise.

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Ranga is multi-cloud certified -  Google Cloud Certified Professional Cloud Architect, Google Cloud Certified Associate Cloud Engineer, AWS Certified Cloud Practitioner,  Azure Fundamentals Certified AZ-900, DP-900 and AI-900.

Our courses are focused on Cloud Certifications (AWS, Azure, Google Cloud Platform - GCP), DevOps, Full Stack (  React, Angular ), Serverless, Programming, and Microservice Development with Java and Spring Boot.

Our Top Courses include:

1) Master Microservices with Spring Boot and Spring Cloud

2) Java Programming for Complete Beginners

3) Google Cloud Certification - Associate Cloud Engineer - 2021

4) DevOps For Beginners - Docker, Kubernetes, and Azure DevOps

5) Spring Framework Master Class - Java Spring the Modern Way

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Reviews

4.6

11,370 ratings on Udemy

Select a bar to show only those reviews.Select the bar again to show every rating.

By Maharaja R on 7/17/2026

Good course with clear explanations of Java Lambdas and Streams. The examples were easy to follow and helped me understand the concepts better. I would recommend it to anyone learning Java functional programming.

By Thomas Lee on 6/4/2026

It's arguably the best course in Functional Programming. Thank you Renga for putting it up for people like to me improve our coding skills. Great Presentation and Crisp Explanation.

By Rinkoo Kaushal on 5/19/2026

Excellent course!! I would highly recommned this course to all those who want to start from basics of Functional programming in Java and become expert by the end of this course.

By Nagajyothi Vemulapalli on 4/25/2026

Great course. I am preparing for interviews after 3 years so looking for the course on streams to refresh quickly(along with practcing exercises over the weekend as I cannot spend lot of time along with office work). This course helped me to refresh my skills quickly.

By Harsha M V on 3/10/2026

I have used earlier lambda and streams in my code. But after going through the course I came to know more about the benefits of using functional programming with lambda and streams. Really good lecture helped me to improve my skills. Thank you very much.

By Anand Singh on 2/6/2026

Covered each topic in detail with programming scenarios. However should also include a video for DateTime API enhancements in Java 8

By Abhijit Thorat on 12/21/2025

It was really great for someone who wants to brush up his rusted knowledge of the small details of Stream API and wants to have a theoretical as well as practical go through. I wish it was not that long though

By Jayant Sharma on 12/18/2025

The course is amazing in teaching streams and functional programming. However after sections 5 things seem to be done in haste without much exercises or examples. It sometime feels the creator is just extending the duration of the course for the sake of it. Basically 2nd last section is about 1.5 hours long, but all he is doing is revising what he taught in an 8( maybe less) hours course.

By Muheeb pasha on 11/21/2025

Functional Programming was Fun, Enjoyable to learn, things made so simple Anybody Can Learn and understand Functional Programming and able to Implement in their Project. Thanks Ranga Sir.

By Lucas Mendes on 11/19/2025

I think we are still discovering the power of functional programming and this course has helped me grasp the main concepts (and practice them a lot). I highly recommend it.

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Read all 11,370 reviews on Udemy

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Overall Score : 92 / 100