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Functional Programming + Lambdas, Method References, Streams (Udemy.com)

Learn amazing features in Java with functional programming, lambda functions, method references and Stream API

Created by: Andrii Piatakha

Last updated November 2025

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What you will learn

  • Functional Programming Approach
  • Core Principles of Functional Programming
  • Lambda Expressions
  • Method References
  • Functional Programming in Java
  • Functional interfaces like Function, BiFunction, Consumer, BiConsumer, Predicate, BiPredicate & others
  • How to write amazing code with functional programming approach in Java
  • Stream API

How it compares

Against the other 34 rated Udemy courses in Scala on CourseDuck:

  • Rating4.2 out of 5higher than 41% of them
  • Reviews352#18 of 35 by number of reviews
  • Length2.5 hoursshorter than 79% of them
  • Last updatedNovember 2025more recently than 91% of them

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Course Description

From this course, you can learn Functional Programming in Java with Lambda expressions (anonymous functions), Method references, and Stream API.

There are a lot of other courses on this topic. So, why would you choose exactly this course?  Here are just a few reasons:

- Coding examples

To learn to program is not enough just watching videos and reading books. You also need to have a lot of practice. In this training course, you will review multiple practical tasks and coding examples which will help you learn and understand Java better.


- Open source code

We hide nothing from our students! Including the source code for the home task solutions and source code of examples that were shared during the lesson. Having the source code you can just copy and paste it to run it on your local computer to understand how things work better.

You are allowed to use all source code examples for learning purposes. This helps significantly to configure the environment and make tests work, especially in case students didn't work with any testing framework in the past.

- Q&A support 

The significant difference between the online and offline learning process is the instructor's availability. If you are in one room with a tutor he always can help you to get understand the specific concept or to help fix your code on your computer.
In this course, we are supporting students with answers to any questions flagged in the Q&A section. In case there will be recurring questions - separate video lessons will be created to show how to address the issue.

So with this course you are not just getting video materials, code exercises, source code, access to the free mobile application without limits (which is still pretty cool, huh? :) ), but you also get tutor support and answers to your questions along with this course.

- Relevant knowledge

After our team investigated other Java courses on Udemy we realized that most of them have nothing in common with real life. The information which is shared there is very old and significantly out of date. For example, the instructor teaches a framework which is not been used already for 15 years. Or instructors do stress on the programming design which is not used anymore at all!

The instructor of this course is a consultant in a top-rated IT outsourcing company and helps to bring cutting-edge solutions in IT for all his clients. Feel free to check the LinkedIn page of the instructor and check skills endorsement. More than 19 thousand people across all over the world (BTW most of them are from the top 100 companies of the world) evaluated the skills of Andrii Piatakha.

With this course, you can be sure that you will spend your time learning the right things from one of the best IT consultants in the world.

- Free mobile App without limits for our students

Knowing Java is one skill. Be able to pass interviews in the company - that is another skill :) Nowadays a lot of companies use tests to select candidates on the first level of interview. We developed applications to practice skills specifically for such purposes.

In this course, we will provide you link to download our FREE mobile app for android. (soon it will be also available for iOS platforms)

The instructor of this course comes up with hundreds of tests that are used to test the knowledge of candidates. With this application, you will be well-prepared for the interview.

Also, only for our students - there is no limit on attempts to pass certification. In the course, we will tell you how to set up a special bonus code that will remove restrictions for our students inside the app.

- High concentration of useful material in each lesson

Sometimes you can notice that watching 5 minutes of our lesson is equivalent to watching another 30 minutes lesson.

This is because time spent for preparation for the lesson (script for the lesson, lesson structure) and video editing (to cut boring pieces of the lesson or time when the program loads) sometimes 10 times as much (sometimes even 20) as the final lesson duration after video editing.

Also, each topic is separated from another. In case some concept will be explained in the next lesson and you don't need to worry about understanding this in the scope of this lesson - the instructor will make an announcement when a specific topic will be covered.

Go and try it yourself! We will appreciate your feedback.



So don't wait! Take a look at the lessons' preview if you still have doubts!

Buy this course today, and you will get all updates for FREE!

For those who successfully passed this training course, or for students who were recognized for asking amazing questions, there is a special offer from the IT-Bulls company! The creator of this course is IT-Bulls company CEO and Founder. We are always in search of talents to run our amazing startups together with you. Probably you always dreamed about running your startup? In this course, you will be able to find the team who will teach you how to do that and (in particular cases) will be glad to help with implementation!

Hope you enjoy this course! And remember, we appreciate all your feedback! Your feedback will help us to become even better! Your feedback will help us to create to best Java course ever!

See you at the lessons! :)


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Instructor Details

Andrii Piatakha

Andrii Piatakha is a highly experienced educator, entrepreneur, project manager and software engineer with over 10 years of teaching experience and a proven track record of empowering students worldwide to achieve their goals in IT. As the Founder and CEO of IT-Bulls, Andrii has dedicated his career to promoting engineering excellence and shaping the next generation of IT professionals.


=== What Sets Andrii Apart? ===

Unparalleled Expertise
Andrii's career spans over a decade, during which he has mentored thousands of students and professionals. His hands-on experience as a software engineer and business leader allows him to deliver courses that are both practical and impactful. Andrii specializes in teaching Java, software architecture, cybersecurity, project management, web and application development, and more.

Transformative Education
Through his highly popular course “Java from Zero to First Job”, Andrii has helped countless individuals with no prior programming experience secure their first jobs in IT. This course is renowned for its structured approach, real-world projects, and ability to prepare students for success in the shortest possible time.

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Reviews

4.2

352 ratings on Udemy

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By Anonymized User on 1/27/2026

Direct to the point and detailed. A perfect short course to study advance features of java.

By Andrew House on 12/30/2024

Felt the coding exercises were jammed in and seemed disconnected from the video lectures. But generally good information overall.

By Gabriel Tirado on 7/23/2024

This is an interesting topic that has required all of my attention. It has made me investigate a lot to understand some topics. For example, to get the trick in raw types. The course says 2 hours of video, but I have already spent a lot of hours per lesson. This is an excellent guide to follow and learn, but it requires a lot of autonomous work. I have read any shared resource, any source code and even I had to investigate by myself from other sources. I think this topic is very difficult to comprehend, but the explanations are very accurate. Please be more clear with exercise: "Implement generics in MyList interface and implementation of this interface". It is difficult to understand the goal of it. Thanks.

By Stefanel Stan on 12/5/2023

A very good and introductory course to Functional programming and generics! It is very well made and has the most important into in it!

By Vishal Dhanokar on 4/3/2023

All the contents in this course are helpful for me. Actually, I am searching such type of codes and preparation for Stream Api. Its covers lots of topics. All is Amazing !! Thank You

By Nimmi Singh on 2/24/2023

it is informative in world of web developement .content is not high level.it's moderate level.

By Omar Zambrano on 6/1/2022

Siento que el contenido del curso está bien, pero la metodología o modo de enseñanza es donde adoloce un poco para que sea más claro, o con un objetivo mas afín . podría desarrollarse quizás como construyendo un proyecto y aplicando los conceptos

By Adolfo Nakamura on 5/2/2022

He explains the concepts based on his experience not based on boots like school. Therefore, this class is helpful for beginners to grasp what Lambda Function with the concepts of Functional programming and Imperative programming.

By Denys Malik on 1/15/2022

Great course. It is well-structured and has a big amount of practice. I've got a lot of useful info from it. Thank you.

By Wojciech Kolarczyk on 2/18/2021

słaby akcent, słabe przykłady

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Read all 352 reviews on Udemy

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Overall Score : 84 / 100