Object Oriented Design

Relationships between Classes

A class is associated with another if you can navigate from objects of one class to objects of the other class.
Example: You can navigate from a Car object to the Tire object, so these classes are associated.
The association relationship is related to the dependency relationship. Association is a stronger form of dependency.
If a class is associated with another, it also depends on the other class.
If a class depends on another, it comes in contact with objects of the other class in some way, not necessarily through navigation.