Functional interfaces in Java

Functional programming has become an essential part of modern Java development, making functional interfaces a key concept every developer should understand.

In his tutorial, our software engineer, Nemanja Marić, breaks down what functional interfaces are, why they matter, and how they enable cleaner, more expressive code using lambda expressions.

Mastering functional interfaces in Java: A practical guide

In Nemanja’s video, you will see how to define your own custom functional interface and explore the most commonly used built-in ones, including Consumer, Supplier, Function, Predicate, and Runnable.

Each interface is explained through approachable, hands-on examples that demonstrate how it works and when to use it in real-world scenarios. Whether you’re preparing for a Java interview or simply upgrading your programming toolkit, this tutorial offers clear guidance and practical insights.

Explore the full tutorial on Nemanja’s YouTube channel to gain a deeper understanding of functional interfaces in Java, or check out the recording below.