Which SOLID principle encourages splitting large interfaces into smaller, specific ones?

Which SOLID principle encourages splitting large interfaces into smaller, specific ones?

• A. Single Responsibility Principle
• B. Open/Closed Principle
• C. Dependency Inversion Principle
• D. Interface Segregation Principle

Answer: (D)

The main concept here is Interface Segregation Principle. This principle says that you shouldn’t force clients to depend on methods they don’t use, so it’s better to have several small, focused interfaces than one large, bloated one. In practice, you break broad capabilities into separate interfaces like Printable, Scannable, and Faxiable, so a class only implements what it actually supports and clients depend on the specific subset they need. That keeps code decoupled and easier to modify or extend. The other SOLID principles address different concerns: Single Responsibility focuses on a class having one reason to change; Open/Closed on extending behavior without modifying existing code; Dependency Inversion on depending on abstractions rather than concrete implementations. So the choice that matches splitting large interfaces into smaller, specific ones is the Interface Segregation Principle.

The main concept here is Interface Segregation Principle. This principle says that you shouldn’t force clients to depend on methods they don’t use, so it’s better to have several small, focused interfaces than one large, bloated one. In practice, you break broad capabilities into separate interfaces like Printable, Scannable, and Faxiable, so a class only implements what it actually supports and clients depend on the specific subset they need. That keeps code decoupled and easier to modify or extend. The other SOLID principles address different concerns: Single Responsibility focuses on a class having one reason to change; Open/Closed on extending behavior without modifying existing code; Dependency Inversion on depending on abstractions rather than concrete implementations. So the choice that matches splitting large interfaces into smaller, specific ones is the Interface Segregation Principle.