122-java-type-design

Refactor primitive obsession in Java by replacing primitive types with domain-specific value objects like EmailAddress or Money. This enforces invariants and improves readability, transforming fragile code into maintainable, type-safe domain models.

Domain-driven type design in Java models business concepts as strict type hierarchies and type-safe wrappers. It organizes classes using composition and inheritance to establish logical structures, consistent naming, and interface-based contract design.

Use BigDecimal for financial logic during Java refactoring to ensure precision-sensitive numeric handling. This approach replaces error-prone primitive doubles, satisfying strict requirements for compilation-verified financial calculations.

Yes, you can refactor legacy Java codebases for type safety. The process applies domain-driven modeling and interface-based contracts to legacy projects, organizing unclear type hierarchies into logical, readable structures.

Design fluent interfaces and consistent method signatures in Java by implementing interface-based contracts. This refactoring approach improves API readability and developer experience through organized, type-safe wrapper implementations.

You need type-safe wrappers when Java code suffers from primitive obsession and inconsistent naming. Wrapping primitives in domain-specific value objects enforces invariants and prevents fragile, hard-to-maintain software structures.