Immutability is the most frequently asked Interview question in Java interviews. This is used to check if the candidates know how immutability works internally. So it's very important to understand…

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Immutability in Java ensures objects cannot be modified after creation, providing benefits like thread safety, caching optimization, and security. The article covers String immutability mechanics, memory management with String Constant Pool, and demonstrates how to create immutable classes using defensive copying, final fields, and proper constructor design. It explores modern approaches like Records, sealed classes, and builder patterns, while addressing common pitfalls like shallow copying and the difference between unmodifiable and truly immutable collections.

Immutability in Java

Why String Immutability Matters: Four Critical Reasons