Summary
An object is a computer representation of an entity, either real world or invented. An object is a concept, abstraction, or thing with sharp boundaries and meaning for an application. Each object in a system has three characteristics: state, behavior, and identity. The state of an object is one of the possible conditions in which it may exist. Behavior determines how an object acts and reacts to requests from other objects. Identity states that each object is unique—even if its state is identical to that of another object.
A class is a description of a group of objects with common properties (attributes), common behavior (operations), common relationships to other objects (associations and aggregations), and common semantics. In the UML ...
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