Starting with Hibernate
An object model uses the principles of abstraction, encapsulation, modularity, hierarchy, typing, concurrency, polymorphism, and persistence. The object model enables you to create well-structured, complex systems. In an object model system, objects are the components of the system. Objects are instances of classes, and classes are related to other classes via inheritance relationships. An object has an identity, a state, and behavior. An object model helps you create reusable application frameworks and systems that can evolve over time. In addition, object-oriented systems are usually smaller than non-object-oriented implementations.
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