Design Patterns

Question 1

Name two Design Patterns

Answer 1

Singleton
Builder
Observable
Factory
Strategy

Question 2

Builder Pattern

Answer 2

An object creation pattern. The point is to separate construction of a complex object from its represantation. This means that the construction process can create different representations.

Question 3

Singleton Pattern

Answer 3

Ensures that there is only one instance of this class. This class can be accessed globally

Question 4

Factory Pattern

Answer 4

Object creation pattern. In this pattern subclasses decide which class to instantiate.

Question 5

Observable Pattern

Answer 5

A pattern where there is a relationship between two objects. Subject and Observer/subscriber. Subjects will notify observers/subscribers when state or information has changed.

Question 6

Strategy Pattern

Answer 6

A pattern that enables selecting an algorithm at runtime. This is done by passing in a devised “strategy” at initialization.