Java record
A Java record is a restricted class declaration for representing data with a fixed set of components and compiler-derived members such as constructors, accessors, and object methods.
The Art of Code
A Java record is a concise Java class declaration for immutable data-oriented objects with automatically derived members.
- How it is used
- Models small immutable domain data so call sites, return types, and transformations communicate intent clearly.
- How deep it goes
- Explains declaration, generated members, compact constructors, validation, typed composition, and record pattern matching, while deferring full generated-code detail.
- Examples
- Uses Person normalization, Employee refactoring, physical-profile BMI classification, typed result records, and people-analysis statistics.
- What you can do after
- Apply it via Java records to define validated immutable carriers and replace generic or boilerplate-heavy data models.
Spring AI in Action
A Java record is a restricted Java class for declaring compact immutable data-carrier types.
- How it is used
- Uses records as compact request and response models in a Spring AI REST application.
- How deep it goes
- Defines single-property records and demonstrates access and construction, but does not develop advanced record features.
- Examples
- Uses Question(String question) and Answer(String answer) as request and generated-answer carriers.
- What you can do after
- Builds compact Java data carriers for application inputs and outputs.
Troubleshooting Java, Second Edition
A Java record is a Java class-like language feature for declaring data-oriented types with implicitly final components and generated data-access methods.
- How it is used
- Strengthens model-layer immutability while constraining on-the-fly data changes during debugging.
- How deep it goes
- Defines implicit final components and the resulting debugger limitation, but does not detail record syntax or generated methods.
- Examples
- Uses paused-debugger variable changes and an "abcd" input to contrast mutable investigation cases with immutable record components.
- What you can do after
- Diagnose debugging constraints by recognizing when record immutability prevents changing investigation data in the IDE.
Read how Troubleshooting Java, Second Edition explains Java record →
100 Java Mistakes and How to Avoid Them
A Java record is a restricted class declaration for modeling data-carrier objects with a compact syntax for components and associated members.
- How it is used
- Uses Java records to store data while avoiding hand-written equality implementations.
- How deep it goes
- Explains compiler-generated equals() and hashCode(), but does not detail record syntax or component semantics.
- Examples
- Uses malformed hand-written equals() implementations, IDE generation dialogs, and EqualsVerifier as practical comparisons.
- What you can do after
- Evaluate when records can replace manual equals() and hashCode() implementations.
Read how 100 Java Mistakes and How to Avoid Them explains Java record →
Related concepts
- contractimplements · An API contract is a specification of the operations, data, and behavioral expectations that govern interactions between software components.
- product typekind of · A product type is a composite type whose values combine one value from each of several component types, such as a tuple or record.
- value objectproduces · A value object is an object whose meaning and equality derive from its attribute values rather than an independent identity, typically with immutable state.
- attributehas part · An attribute is a named property, value, or piece of information associated with an entity, object, or program element.
- immutable collectionkind of · An immutable collection is a collection whose membership and contents cannot be changed after creation.
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