Core Java · interview question
A Java class has a mutable collection exposed through a public getter. What refactoring ensures encapsulation while maintaining functionality?
Multiple choiceHardchapter-3-curatedpremiumcore-javacode-reading-and-state-safety
Answer and explanation
Correct answer
A. Return an unmodifiable collection or a defensive copy.
Why
Returning an unmodifiable collection or a defensive copy prevents external code from altering the internal state of the class, thereby preserving encapsulation while still allowing read access.
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