Additional Notes
Why is returning a raw internal collection dangerous?
Track: Java
Topic: OOP
Focus: Defensive Copying
Java: Defensive Copying
Answer
Callers can mutate the object's internals without permission.
Encapsulation is not only about single fields. If a cart exposes its mutable items list directly, outside code can change the cart's state without going through the cart's rules.
Encapsulation is not only about single fields. If a cart exposes its mutable items list directly, outside code can change the cart's state without going through the cart's rules.
Topics: Defensive Copying Java OOP