144-java-data-oriented-programming

name	144-java-data-oriented-programming
description	Use when you need to apply data-oriented programming best practices in Java — including separating code (behavior) from data structures using records, designing immutable data with pure transformation functions, keeping data flat and denormalized with ID-based references, starting with generic data structures converting to specific types when needed, ensuring data integrity through pure validation functions, and creating flexible generic data access layers. Part of the skills-for-java project
license	Apache-2.0
metadata	{"author":"Juan Antonio Breña Moral","version":"0.13.0-SNAPSHOT"}

Java Data-Oriented Programming Best Practices

Apply data-oriented programming in Java: separate data from behavior with records, use immutable data structures, pure functions for transformations, flat denormalized structures with ID references, generic-to-specific type conversion when needed, pure validation functions, and flexible generic data access layers. All transformations should be explicit, traceable, and composed of clear pure functional steps.

What is covered in this Skill?

• Separation of concerns: data structures (records, POJOs) vs behavior (utility classes, services)
• Immutability: records, final fields, transformations produce new instances
• Pure data transformations: functions depending only on inputs, no side effects
• Flat and denormalized data: ID references instead of deep nesting
• Generic until specific: Map<String,Object> for dynamic data, convert to records when processing