Language Upgrades · interview question
When can sealing an interface become a design mistake?
Multiple choiceHardchapter-12-curatedpremiumlanguage-upgradessealed-classes
Answer and explanation
Correct answer
C. When the interface is meant to stay open for plugin or adapter-style extension
Why
If outside modules or future integrations are expected to provide implementations, sealing the type can block legitimate extension. Closed and open parts of the design should be modeled differently.
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