SOLID Design Principles

Question 1

Single-responsibility principle

Answer 1

A class should have only one responsibility.

Question 2

Open-closed principle

Answer 2

A software entity should be open for extension, but closed for modification.

Question 3

Liskov substitution principle

Answer 3

If S is a subtype of T, then objects of type T may be replaced with objects of type S.

Objects of a superclass shall be replaceable with objects of its subclasses without breaking the application.

Question 4

Interface segregation principle

Answer 4

No client should be forced to depend on methods it does not use.

Question 5

Dependency inversion principle

Answer 5

High-level modules should not depend on low-level modules. Both should depend on abstractions.

Abstractions should not depend on details. Details should depend on abstractions.