java-21

Java 21 records provide a concise syntax for creating immutable data transfer objects. You define them using the record keyword to automatically generate constructors, accessors, and equality methods, ensuring safer and more concise data handling.

Sealed types in Java 21 let you model closed hierarchies using the sealed and permits keywords. Combined with pattern matching in switch expressions, they enable exhaustive and safe type checking without default cases.

Use virtual threads for scalable I/O operations when your Java application handles high-concurrency blocking tasks. Virtual threads allow efficient management of blocking operations without consuming platform threads, improving performance.

Yes, you can integrate Java 21 features into existing microservices. Use records for immutable DTOs, sealed types for domain models, and virtual threads to handle API endpoint requests efficiently, ensuring safer and more concise code.

The best way to model closed hierarchies in Java 21 is using sealed types. By declaring a sealed class and explicitly permitting specific subclasses, you ensure domain models are well-defined and enable exhaustive pattern matching.