Objects (Basic Concepts of OOAD)

An object is a real word element in an object oriented environment that may have a physical or a conceptual existence.
Objects can be modeled according to the needs of the application. An Object may have physical existence like a customer, a car etc. or an intangible conceptual existence like a project, a process etc.

Each Object has:

• Identity that distinguish it from other objects in the system.
• state that determines the characteristic properties that the object holds.

Behavior that represent externally visible activities performed by an object in terms of changes in its state.