Object-oriented programming · interview question
Why do multi-object rules matter when Cart.addItem(...) both reserves product stock and adds a CartItem?
Multiple choiceMediumchapter-3-curatedpremiumoopobject-responsibility
Answer and explanation
Correct answer
B. Because correctness now depends on keeping more than one object consistent together
Why
A checkout model can be wrong even if each object looks valid by itself. If stock is not reserved before the cart item is created, the system can drift into partially applied or inconsistent state.
Test yourself on Object-oriented programming
A free test with instant, explained results. No account needed.
More Object-oriented programming questions
- In a typical e-commerce application, how should a CartItem object access the price of a Product?
- What design principle is violated if a Cart class directly manipulates a Product's price?
- Why might CartItem hold a Product reference instead of copying every product field into loose variables?
- In the context of e-commerce, which class is most likely to contain a method called calculateTotalPrice()?
- What access modifier should be used for fields to adhere to encapsulation principles?
- How would you explain a key reason to use encapsulation when designing an object with multiple responsibilities in an…