Member-only story
🔒 How to Make an Immutable Class in Java (Step-by-Step Guide)
Learn how to create an immutable class in Java with real-world examples. Understand why immutability matters, and follow best practices to design robust, thread-safe objects.
4 min readApr 3, 2025
What is an Immutable Class?
In Java, an immutable class is a class whose objects cannot be modified after they are created.
Once an object is created, its state (data) stays the same forever.
Popular example?
➡️ String in Java is immutable.
💡 Real-world Analogy:
A date of birth is immutable. Once set, it should never change.
🤔 Why Create Immutable Classes?
Here’s why developers love immutability:
Famous Immutable Classes in Java
StringIntegerBigDecimalLocalDate,LocalTime(Java 8 Time API)
Ever wondered why String is immutable? Because it's used everywhere — making it immutable ensures safety and efficiency.
