This is just the same as an object in the real world: a dog, for example, has properties (brown fur, four legs, 30cm tall) and functions (bark, sleep, rollover, poop).

OrderLine is a second-class object example. ... The JDO OQL resembles SQL, except that it operates on Java classes and objects, ... JDO in real life.

Get to know the Java persistence standard based on Hibernate and learn how to use JPA to store and manage Java objects in a relational or NoSQL database. Topics Spotlight: AI-ready data centers ...

Object-oriented systems are usually partitioned into layers of related responsibilities and only dependencies in one direction are allowed, from higher layers (more specific, less reusable) to lower ...