java-21

Virtual threads in Java 21 allow you to scale I/O-bound operations efficiently by providing lightweight concurrency. You can employ them for non-blocking API calls to handle massive concurrent tasks without consuming heavy OS thread resources.

Records are the best way to create immutable data structures in Java 21. They provide a concise and safe syntax for writing data carriers and DTOs, automatically generating constructors, accessors, and equality methods.

Pattern matching with sealed types in Java ensures exhaustive handling of hierarchical structures. By defining sealed interfaces, the compiler verifies that all possible subtypes are covered in switch statements, ensuring robust state management.

Yes, you can refactor existing Java code to use records for DTOs. This migration reduces boilerplate code while enforcing immutability, resulting in modern, safe, and concise data carrier implementations.

You need sealed interfaces for state management when handling hierarchical data that requires exhaustive pattern matching. They restrict which classes can implement or extend them, ensuring all variations are known and safely processed at compile time.