Functional Interface in Java 8 | Lambda & @FunctionalInterface Annotation

Published: 07 September 2025
on channel: CodeJourneyWithShubh

In this video, we will learn about Functional Interfaces in Java 8.
A Functional Interface is an interface with only one abstract method (SAM - Single Abstract Method).
It is the backbone of Lambda Expressions and Streams in Java.

Topics Covered:
✅ What is a Functional Interface?
✅ @FunctionalInterface annotation
✅ Examples: Runnable, Callable, Comparator
✅ Creating our own Functional Interface
✅ Using Functional Interface with Lambda Expressions
✅ Why Functional Interfaces are important in Java 8

This video is part of my Java 8 Tutorial Series.
If you are preparing for interviews or want to understand modern Java concepts, this series will help you a lot.

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#Java8 #FunctionalInterface #JavaTutorial #LambdaExpression

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