Quick study sessions to strengthen memory and retain key concepts.
Why validate method inputs?
To ensure the method's logic operates on valid data. Validating inputs in methods prevents errors and unexpected behavior…
View Card →How does immutability help maintain invariants?
Immutability prevents state changes, ensuring invariants are maintained. Immutable objects do not allow changes to their state once…
View Card →How would you explain an invariant in OOP in an interview?
An invariant is a condition that must always hold true for an object. Invariants are rules that define…
View Card →Why is constructor validation important?
Constructor validation ensures an object is created in a valid state. When creating an object, constructor validation checks…
View Card →How would you explain an invariant in an interview?
A rule that should always remain true for a valid object. Examples include 'price cannot be negative' or…
View Card →Why are interfaces crucial for testability and substitution in Java applications?
Interfaces support testing and substitution by defining contracts. Interfaces define a contract that can be implemented by any…
View Card →How do interfaces enable multiple capabilities in Java?
Interfaces allow a class to inherit multiple capabilities. In Java, a class can implement multiple interfaces, enabling it…
View Card →How would you explain a functional interface in a Java interview?
An interface with a single abstract method, used for lambda expressions. Functional interfaces contain exactly one abstract method…
View Card →Why might you use a marker interface in Java?
To provide metadata to classes without defining methods. Marker interfaces in Java are used to indicate that a…
View Card →Why do teams use interfaces over abstract classes in production code?
Interfaces provide multiple inheritance capabilities and focus on defining behavior. Interfaces allow multiple inheritance, meaning a class can…
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