Learn where Java records simplify immutable data carriers and where classes remain better.
The core idea
A record is a concise Java type for a fixed set of data components. The compiler generates accessors, equality, hash code, and a readable string representation. Records are shallowly immutable: a referenced mutable object can still change.
A practical way to approach it
Use records for request/response models, simple values, and results returned from a calculation. Add compact constructors to validate invariants. Use a regular class when you need mutable state, complex inheritance, or behavior that does not fit a data carrier.
Try it in a small project
Create a StudentScore record with an ID and score, validate that the score is in range, and write a test for both valid and invalid values. Then compare it with a traditional class to see which communicates the model more clearly.
Common mistakes to avoid
Do not assume records are automatically safe for every domain model. Validate constructor inputs and consider whether referenced collections should be copied defensively.
Key takeaway
Keep the first version small, make your assumptions explicit, and verify the result with a repeatable test. For production use, check the current official documentation for the tools and versions you choose.