Object-oriented programming · interview question
In Java, how would you ensure that a Product class's price cannot be changed once it's set at construction?
Multiple choiceMediumchapter-3-curatedpremiumoopencapsulation
Answer and explanation
Correct answer
D. Make the price field final and private
Why
By making the price field final and private, it can only be set once during object construction, ensuring that it cannot be changed later. This practice is a key principle of immutability, which helps maintain object integrity.
Test yourself on Object-oriented programming
A free test with instant, explained results. No account needed.
More Object-oriented programming questions
- Why does declaring a method as 'final' in a superclass change runtime behavior?
- Why might a developer choose to use a 'restock' method rather than a public setter for inventory?
- How do unmodifiable views differ from defensive copies in protecting internal collections?
- In an e-commerce application, what is the advantage of using a 'processOrder' method in a Product class?
- Which statement is true about interfaces in Java?
- Why are public mutable fields risky in a store model?