How does the set collection deal with duplicate elements?

  1. An exception is thrown if you attempt to add an element with a duplicate value.

  2. The add method returns false if you attempt to add an element with a duplicate value.

  3. A set may contain elements that return duplicate values from a call to the equals method.

  4. Duplicate values will cause an error at compile time.


Correct Option: B
Explanation:

To answer this question, the user needs to understand the basic functionality of the Set collection in Java.

Option A is incorrect. When attempting to add an element to a Set that already exists in the Set, an exception is not thrown. Instead, the Set simply ignores the duplicate element and does not add it to the collection.

Option B is correct. The add method of a Set returns a boolean value of false if the element being added already exists in the Set. This is because Sets do not allow duplicate elements.

Option C is incorrect. Sets are designed to contain only unique elements. If an element already exists in the Set, it will not be added again. Therefore, a Set cannot contain elements that return duplicate values from a call to the equals method.

Option D is incorrect. Duplicate values will not cause an error at compile time. Instead, the Set will simply ignore the duplicate value when the code is executed.

Therefore, the correct answer is:

The Answer is: B. The add method returns false if you attempt to add an element with a duplicate value.

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