Multiple choice technology programming languages

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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When adding a duplicate element to a Set, the add() method returns false but does not throw an exception. Sets are designed to contain only unique elements - duplicates are simply ignored. The add() method's return value indicates whether the element was actually added (true if it was a new element, false if it was a duplicate). No compile-time or runtime error occurs.

Keep practicing — related questions