Create Immutable Class in Java | Interview Questions & Pitfalls
In this video, we deep dive into Immutable Classes in Java and clearly explain how to create your own custom immutable class step by step.
You’ll learn what immutability really means, why immutable objects are important, and how immutability can silently break if rules are not followed properly — something that is frequently asked in Java interview questions.
🎯 What you’ll learn in this video:
✔️ What is an immutable class in Java
✔️ What is an immutable object and immutable state
✔️ Rules to create an immutable class in Java
✔️ How to create a custom immutable class from scratch
✔️ Example of immutable object with real Java code
✔️ How and when immutability breaks
✔️ Common mistakes developers make while creating immutable classes
✔️ Immutable class interview questions explained with clarity
This video is perfect for:
✅ Java beginners
✅ Intermediate Java developers
✅ Interview preparation
✅ Anyone who wants to deeply understand immutable objects and classes in Java
By the end of this video, you’ll be able to confidently explain and implement Java immutable classes in real-world applications.
00:00 : Introduction
00:18 : What is an Immutable Class?
00:56 : Remove Setter methods
03:11 : Fields must be private
05:02 : Constructor initialization
07:23 : Fields must be final
12:09 : Class should be final
14:36 : Don’t return original reference of mutable fields
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