2.7 Concepts that Define Object Orientation

Necessary for a system or language to be OO

• Identity

  • Each object is distinct from each other object, and can be referred to
  • Two objects are distinct even if they have the same data
• Classes

  • The code is organized using classes, each of which describes a set of objects
• Inheritance

  • The mechanism where features in a hierarchy inherit from superclasses to subclasses
• Polymorphism

  • The mechanism by which several methods can have the same name and implement the same abstract operation.

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