Unity Certified Professional Programmer Practice Questions - Unity Certified Professional Programmer Exam

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Your gameplay code has a tight coupling problem: a PlayerHealth class directly instantiates and references a concrete UIHealthBar class, making it impossible to test PlayerHealth without the UI. Which SOLID principle is most directly violated, and what is the standard fix?

Dependency Inversion Principle; depend on an interface (e.g., IHealthObserver) so high-level code does not depend on a concrete UI implementation Single Responsibility Principle; merge the two classes so health and UI live together Liskov Substitution Principle; make UIHealthBar inherit from PlayerHealth Open/Closed Principle; mark UIHealthBar as sealed so it cannot change

Correct Answer:

Dependency Inversion Principle; depend on an interface (e.g., IHealthObserver) so high-level code does not depend on a concrete UI implementation

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