Lecture 4 - Architecture Abstraction

Question 1

What is Abstraction

Answer 1

• simplify complex problems by representing essential features and hiding unnecessary details

Question 2

What is decomposition?

Answer 2

• breaking down large entities into smaller ones
• goal: modular, maintainable, flexible designs

Question 3

Poor decomposition example

Answer 3

• One class is responsible for almost all the operations
• Multiple responsibilities per class

Question 4

What is coupling?

Answer 4

• Density of dependencies among classes
• If a class changes and there is high coupling, other classes needs to change as well

Question 5

Tight vs Loose Coupling?

Answer 5

Tight:
- Classes create other classes directly
- Maintains direct reference

Loose:
- Classes referred through parameters

Question 6

What is cohesion?

Answer 6

• Degree of unity or closeless among elements WITHIN a class
• Goal: Each class should represent a single concept

Question 7

Low cohesion vs high cohesion

Answer 7

Low
- classes mixing responsibilities with other classes
High
- Class information restricted to the class