Discussion
Which of these statements about what Collections.disjoint reports is correct?
Answer: D
Correct answer: Whether the two collections have no elements in common.
Collections.disjoint returns true when the two collections share no element, which makes it the efficient way to ask “do these overlap?” without building an intersection. It returns true for an empty collection, since an empty set shares nothing with anything, and it reports a boolean rather than a count.
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