Can you explain the principles underlying the SOLID concept in object-oriented programming?

SOLID is a set of five object-oriented programming principles aimed at creating flexible and maintainable systems:

1. Single Responsibility Principle (SRP) — a class should have only one reason to change.
2. Open/Closed Principle (OCP) — classes should be open for extension but closed for modification.
3. Liskov Substitution Principle (LSP) — objects of subclasses should be replaceable with objects of the base class without affecting correctness.
4. Interface Segregation Principle (ISP) — clients should not depend on interfaces they do not use.
5. Dependency Inversion Principle (DIP) — high-level modules should not depend on low-level modules; both should depend on abstractions.

Applying these principles helps create code that is easier to test, extend, and maintain, especially important in Flutter development where architecture and scalability are key.