Java 8 Functional Interfaces Explained with Real Examples | Predicate Function Consumer Supplier

Published: 25 April 2026
on channel: WeekendDevCraft
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In this video, I explain Java 8 Functional Interfaces using real-world backend examples and simple analogies.

Topics covered:

What is a Functional Interface
Predicate (Filtering data)
Function (Transforming data)
Consumer (Performing actions)
Supplier (Generating values)
Bonus: UnaryOperator & BinaryOperator

Real-world mapping:

Product filtering in e-commerce
DTO transformation in APIs
Logging & notifications
Order ID generation

This video is perfect for:

Java Developers
Backend Engineers
Software Engineer Interviews

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