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Java Interfaces Explained with Code to Interface Guide

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By Pratik Bhuite | 9 min read

Hub: Java / Interview Fundamentals

Series: Java Interview & Problem Solving Series

Last updated: Aug 30, 2026

Part 5 of 5 in the Java Interview & Problem Solving Series

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Is Java Pass by Value or Pass by Reference Explained
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Java Interfaces Explained: How to Code to an Interface

Java interfaces are one of the core tools for writing flexible object-oriented code.

If you understand how to code to an interface instead of a concrete implementation, your Java code becomes easier to extend, mock in tests, and adapt to changing requirements. This guide explains the concept with examples instead of abstract theory.

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YouTube Videos

  1. “Java Interface Explained | Complete Interface Tutorial with Real-Life Examples (2026)” https://www.youtube.com/watch?v=5oyw4VW7CFM

  2. “Interfaces in Java – Complete Guide” https://www.youtube.com/watch?v=vY49exEcXPA

  3. “Java Interface Explained” https://www.youtube.com/watch?v=BrUuDnmtvK8

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