OOP/UML/Design Patterns

Question 1

What are the 4 principles of OOP?

Answer 1

Abstraction, inheritance, encapsulation, and polymorphism

Question 2

What does SOLID stand for?

Answer 2

Single Responsibility, Open-Closed Principle, Liskov Principle, Interface Segregation Principle, Dependency Inversion Principle

Question 3

What is the single responsibility principle?

Answer 3

A class should only have one reason to change; different classes handle different tasks and problems

Question 4

What is the Open-Closed Principle?

Answer 4

Classes should be open for extension but closed for modification

Question 5

What is Liskov’s substitution principle?

Answer 5

You should be able to substitute a base type for a subtype

Question 6

What is the Interface Segregation Principle?

Answer 6

Don’t put too much into an interface; split into separate interfaces

Question 7

What is the Dependency Inversion principle?

Answer 7

High level modules should not depend on low level modules