POJO
POJO (Plain Old Java Object) is a design concept in Java programming that refers to a simple Java class that does not depend on any specific framework or library. It typically contains private fields with public getter and setter methods, and follows standard Java conventions without extending framework-specific classes or implementing special interfaces. This concept promotes clean, reusable, and testable code by decoupling business logic from framework dependencies.
Developers should use POJOs when building Java applications that require maintainable, portable, and testable code, especially in enterprise systems, microservices, or data transfer objects (DTOs). They are essential for frameworks like Spring and Hibernate, which rely on POJOs for configuration and persistence, as they allow for easier serialization, deserialization, and integration with various tools without vendor lock-in.