Ch.10

Question 1

What does “class abstraction” do?

Answer 1

Separates class implementation from class use.

Question 2

What is a class’s “contract” ?

Answer 2

Collection of public constructors/methods/fields and their descriptions.

Question 3

What is “class encapsulation” ?

Answer 3

Details of implementation are hidden(‘encapsulated’) from the user.

Question 4

Why is a class an “abstract data type” (ADT) ?

Answer 4

Its implementation is separated from its use and the implementation details are hidden from the user.

Question 5

What is an “association” between two classes?

Answer 5

General binary relationship describing an activity.
i.e. A “Course” object could have associations with both “Student” and “Faculty” classes.

Question 6

What is a “multiplicity” of a class involved in an association?

Answer 6

Specifies how many of the class’s objects are in the relationship AKA association.

Question 7

What is an “aggregation” association?

Answer 7

Special association, represents ownership relationship between two objects.

Question 8

What is a composition?

Answer 8

An aggregation between two objects where the owned/aggregated object is dependent on the owner/aggregating object.