Discussion :: Objects and Collections
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Which statement is true for the class java.util.HashSet?
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A.
The elements in the collection are ordered.
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B.
The collection is guaranteed to be immutable.
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C.
The elements in the collection are guaranteed to be unique.
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D.
The elements in the collection are accessed using a unique key.
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Answer : Option C
Explanation :
Option C is correct. HashSet implements the Set interface and the Set interface specifies collection that contains no duplicate elements.
Option A is wrong. HashSet makes no guarantees as to the iteration order of the set; in particular, it does not guarantee that the order will remain constant over time.
Option B is wrong. The set can be modified.
Option D is wrong. This is a Set and not a Map.
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