class definition

Objects are created according to some object class definition . An object class definition serves as a template for objects. It includes declarations of all the attributes and services which should be associated with an object of that class.

Object class

An object is an entity that has a state and a defined set of operations which operate on that state. The state is represented as a set of object attributes. The operations associated with the object provide services to other objects (clients) which request these services when some computation is required.