Learn amazing features in Java with functional programming, lambda functions, method references and Stream API
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
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 The information which is shared there is very old and significantly out of date.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! 🙂
Content
Introduction
Functional Programming: General Overview & Core Concepts
Lambda Functions & Method References & Functional Interfaces in Java
Interfaces from java.util.function package
Reference Section: Generics in Java
Bonus section
Overview: Moving Beyond the “Old Java” Mindset
Look, if you’re still writing Java like it’s 2012, you’re not just behind the curve—you’re actively making your life harder. I’ve spent a decade in the trenches of enterprise software, and the shift from imperative to functional programming in Java was the biggest game-changer since the introduction of Generics. This course, “Functional Programming + Lambdas, Method References, Streams,” isn’t just a syntax walkthrough; it’s a mental rewiring.
Most developers approach Lambda expressions as “shorter ways to write anonymous classes,” but that’s a rookie perspective. This course pushes you to embrace a declarative style. Instead of micro-managing every loop and temporary variable, you learn to describe *what* you want the data to become, rather than *how* the CPU should move bits around. The curriculum dives deep into the Stream API, which is essentially the engine room of modern Java. We’re talking about moving from clunky 15-line for-loops to three lines of elegant, readable, and pipe-able code. This isn’t just about making things look “cool”—it’s about reducing the surface area for bugs and making your codebase significantly easier to maintain.
Prerequisites
Don’t jump into this if you’ve never seen a `public static void main` method. To get the most out of these hands-on labs, you should have a solid grasp of basic Java syntax. You need to understand what an interface is and how object-oriented inheritance works. If you’re comfortable with basic collections (like List and Map) and you’ve felt the frustration of writing the same boilerplate code over and over again, you’re exactly where you need to be. This is a beginner to advanced transition course, so while it starts with the basics of functional interfaces, it quickly scales into complex data pipelines.
Skills & Tools
The course focuses heavily on industry-standard tools and the modern Java ecosystem. You’ll be working within professional IDEs—likely IntelliJ IDEA or Eclipse—learning how to leverage their built-in refactoring tools to convert “old” code into functional patterns.
Key skills you’ll sharpen include:
- Mastering the java.util.function package, specifically understanding the nuances between a `Supplier`, a `Consumer`, and a `Predicate`.
- Writing high-performance data pipelines using the Stream API, including intermediate and terminal operations.
- Effective use of Method References to further clean up your code by referencing existing methods directly.
- Understanding the transition from Imperative to Declarative logic, which is a core requirement for modern microservices development.
Career Benefits & Job Roles
Let’s talk money and career growth. In today’s market, if you’re applying for a Senior Java Developer or a Backend Engineer role at a top-tier tech firm, “knowing Java” isn’t enough. You are expected to be fluent in functional paradigms. This course is an excellent piece of certification prep for those eyeing the Oracle Certified Professional (OCP) exams, where functional programming and Streams take up a massive chunk of the syllabus.
By mastering these job-ready skills, you position yourself for roles in high-scale environments. Whether you are aiming for a Cloud Architect position or a Data Engineer role, the ability to process large datasets efficiently using functional patterns is a non-negotiable requirement. Companies are looking for developers who can write clean, thread-safe code that integrates well with modern frameworks like Spring Boot and Quarkus. Completing the real-world projects included here gives you the portfolio pieces needed to prove you can handle enterprise-level complexity.
Pros
- Say Goodbye to Boilerplate: The course does a fantastic job showing you how to delete hundreds of lines of useless code. By using Functional Interfaces like `BiFunction` or `BiPredicate`, you learn to write generic, reusable logic that actually scales.
- Deep Dive into the Stream API: This isn’t just `filter()` and `map()`. The course covers the more complex collectors and flat-mapping, which is where most developers usually get stuck in real-world projects.
- Practical Refactoring: It provides a clear bridge between how things “used to be done” and the modern approach. This is vital for anyone working on legacy systems who needs to modernize a codebase without breaking it.
- Strong Focus on Readability: You’ll learn why functional code is often “self-documenting,” which is a huge plus for team collaboration and long-term career growth in senior roles.
Cons
The only real “gotcha” here—and this is a common critique of the functional approach in general—is the debugging learning curve. When you have a massive Stream pipeline, traditional line-by-line debugging becomes a bit of a nightmare. The course could spend a bit more time on how to use “peek()” effectively or how to interpret the often-cryptic stack traces that occur when a Lambda fails deep inside a parallel stream. It requires a different way of thinking about errors that might frustrate a traditional imperative programmer at first.