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Explain Which of this interface must contain a unique element?

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Which of this interface must contain a unique element? (a) Set (b) List (c) Array (d) Collection This question was posed to me in final exam. I'm obligated to ask this question of Collections Interface topic in chapter java.util – The Collections Framework of Java Select the correct answer from above options

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Correct choice is (a) Set The explanation: Set interface extends collection interface to handle sets, which must contain unique elements.

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