Chapter 5: Design Properties

According to Parnas (1972), which of these is NOT a benefit of information hiding?

• Parallel development

• Changeability

• Comprehensibility

• Increased Cohesion

A system uses tables to display data. Some tables sort by clicking column headers, others don't. Some show prices in euros, others in dollars. What design property is violated?

• Information Hiding

• Cohesion

• Conceptual Integrity

• Coupling

In the ParkingLot example, why should the vehicles data structure be private?

• To allow changing the data structure without impacting clients

• To make the code run faster

• To prevent compilation errors

• To save memory

A cohesive class should have how many responsibilities? (Select all that apply)

• One single responsibility

• Two complementary ones

• At least three

• As many as possible

Tags

CCSS.RI.1.1

CCSS.RI.1.4

CCSS.RI.2.1

CCSS.RI.3.1

CCSS.RL.2.1

Which is an example of ACCEPTABLE coupling?

• Classes communicating through hidden data

• Two classes sharing global variables

• Class A directly reading Class B's private file

• A class using public methods from Java's Hashtable

Which function violates cohesion principles?

• pop() - removes top element from stack

• sin_or_cos(x, op) - calculates sine OR cosine based on a flag

• getBalance() - returns account balance

• calculateDropoutRate()

What makes coupling "poor" rather than "acceptable"?

• Dependencies not mediated by stable interfaces

• Having dependencies

• Writing long method names

• Using too many classes