Additional Notes
How would you explain an invariant in an interview?
Track: Java
Topic: OOP
Focus: Invariants and Validation
Java: Invariants and Validation
Answer
A rule that should always remain true for a valid object.
Examples include 'price cannot be negative' or 'quantity must be at least one.' Constructors and mutation methods should protect those rules so the object never becomes nonsense.
Examples include 'price cannot be negative' or 'quantity must be at least one.' Constructors and mutation methods should protect those rules so the object never becomes nonsense.
Topics: Invariants and Validation Java OOP