Immutable Classes in Java: A Comprehensive Guide (Java 7, Java 8, Spring Boot, and Interview Questions)

Overview

Immutable classes play a significant role in Java development by ensuring that an object’s state cannot be modified after it’s created. This article covers the concept of immutability, how to implement immutable classes in Java 7 and Java 8, their use cases in Spring Boot, and common interview questions on the topic.

Immutable Classes in Java: A Comprehensive Guide (Java 7, Java 8, Spring Boot, and Interview Questions)

Table of Contents

1. What is an Immutable Class?
2. Why Use Immutable Classes?
3. How to Create an Immutable Class in Java 7
4. Immutable Classes Using Java 8 Features
5. Use Case: Immutable Classes in Spring Boot
6. Interview Questions on Immutable Classes
7. Conclusion

What is an Immutable Class?

An immutable class is one whose objects cannot be modified after they are created. Once you create an instance of an immutable class, its state remains constant throughout its lifetime.

Key Characteristics of Immutable Classes:

• All fields are final.
• No setter methods.
• The class itself is…