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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

1 Answer

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Best answer
Correct choice is (a) Set

The explanation: Set interface extends collection interface to handle sets, which must contain unique elements.

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