Design Patterns

Question 1

What is the relationship between refactoring and design patterns?

Answer 1

We can REFACTOR TOWARDS a design pattern (not necessarily match)

Question 2

What are the 3 groups of design patterns?

Answer 2

Behavioural
Structural
Creational

Question 3

Which design pattern allows an object to change its behaviour based on it’s internal state?

Answer 3

the state pattern

Question 4

Which design pattern allows an object to change how it performs a task?

Answer 4

the strategy pattern

Question 5

What does the factory design pattern refer to?

Answer 5

A CLASS who’s job is to CREATE objects

Question 6

What does the singleton design pattern refer to?

Answer 6

A CLASS that only has ONE INSTANCE with a GLOBAL POINT OF ACCESS

Question 7

What does the adapter design pattern refer to?

Answer 7

Convert one interface into ANOTHER using a WRAPPER CLASS

Question 8

Which design pattern refers to composing a tree structure of objects? Benefit?

Answer 8

The composite design pattern, It allows the client to use an individual part (object) and the whole composition (tree) in the same way