map

[josephine chen]

Which most closely matches a description of a java Map
A vector of arrays for a 2D geographical representation//f
A class for containing unique array elements//f
A class for containing unique vector elements//f
An interface that ensures that implementing
classes cannot contain duplicates //true

[Siddhu]

Yes you are rigth shan, the answer is 4)
An interface that ensures that implementing
classes cannot contain duplicates

[Tony Alicea]

That question was incorrect and I think it's being corrected in Marcus' site. It's from gEs which was JTest beta before that, and free.
The answer has to add keys after "duplicate".
No duplicate KEYS. a SET does not allow duplicate elements.