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Which of these is a mechanism for naming and visibility control of a class and its content?

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Which of these is a mechanism for naming and visibility control of a class and its content?

(a) Object

(b) Packages

(c) Interfaces

(d) None of the Mentioned.

This question was addressed to me in an online quiz.

I need to ask this question from Packages in section Interfaces & Packages of Java

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Right option is (b) Packages

Easy explanation: Packages are both naming and visibility control mechanism. We can define a class inside a package which is not accessible by code outside the package.

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