Introduction to OOP

Chapter 3: Object-Oriented Design:

Behavior and State

All components can be characterized by two aspects:

The behavior of a component is the set of actions a component can perform. The complete set of behavior for a component is sometimes called the protocol.
The state of a component represents all the information (data values) held within a component.

Notice that it is common for behavior to change state. For example, the edit behavior of a recipe may change the preparation instructions, which is part of the state.

Behavior and State

Intro OOP, Chapter 3, Slide 23