FUNDAMENTALS OF COMPUTER

DATABASE FUNDAMENTALS

BASICS OF BIG DATA

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

You need to store elements in a collection that guarantees that no duplicates are stored and all elements can be accessed in natural order. Which interface provides that capability?

A	java.util.Map
B	java.util.Set
C	java.util.List
D	java.util.Collection

Explanation:

Detailed explanation-1: -Option B is correct. A set is a collection that contains no duplicate elements.

Detailed explanation-2: -Option B is correct. A set is a collection that contains no duplicate elements.

Detailed explanation-3: -Expert-Verified Answer You need to store elements in a collection that guarantees that no duplicates are stored and all elements can be accessed in a natural order. Which interface provides that capability? The correct option is (B). java.

Detailed explanation-4: -HashSet internally uses HashMap to store objects. It doesn’t contain duplicate elements. All elements in a HashSet are unique. It doesn’t maintain the insertion order.

Detailed explanation-5: -HashSet is a Set Interface implementation that does not allow duplicate values. The essential point is that objects stored in HashSet must override equals() and hashCode() methods to ensure that no duplicate values are stored in our set. HashMap is a Map Interface implementation that maps a key to a value.

There is 1 question to complete.