Core Java 12: SOLID Principles

Question 1

SOLID Design Principles

Answer 1

A set of guidelines for making code more reusable and reliable.

Question 2

SRP

Answer 2

Single Responsibility Principle: A class should have only one reason to change.

Question 3

OCP

Answer 3

Open-Closed Principle: Open for extension, closed for modification.

Question 4

LSP

Answer 4

Liskov Substitution Principle: Subtypes must be substitutable for their base types. Penguin’s fly() method would throw an error if fly() is built into Bird. Instead create a separate FlyingBird class inheriting from Bird.

Question 5

ISP

Answer 5

Interface Segregation Principle: Don’t force clients to depend on methods they don’t use. Keep interfaces small.

Question 6

DIP

Answer 6

Dependency Inversion Principle: High-level modules should not depend on low-level modules.
Both should depend on abstractions.