Core Java Programming Course- Hash Set

This video tutorial covers the concept of sets in Java, highlighting their unique characteristics compared to lists, such as not allowing duplicate elements and not maintaining insertion order. It explains basic operations like adding, removing, and checking elements in a set. The tutorial also demonstrates how to perform union and intersection operations on sets and convert a set into a list.

What is a fundamental difference between a set and a list in Java?

• Sets maintain insertion order, lists do not.

• Sets allow positional access, lists do not.

• Sets can hold duplicate elements, lists cannot.

• Sets cannot hold duplicate elements, lists can.

Which of the following is true about the insertion order in a HashSet?

• HashSet sorts elements in ascending order.

• HashSet allows positional access based on insertion order.

• HashSet does not guarantee the insertion order.

• HashSet maintains the insertion order.

How can you add an element to a HashSet in Java?

• Using the insert method.

• Using the append method.

• Using the push method.

• Using the add method.

What happens when you add a duplicate element to a HashSet?

• The duplicate element is ignored.

• An error is thrown.

• The duplicate element is added.

• The set is cleared.

What does the union operation on two sets return?

• Only the elements present in the second set.

• All unique elements from both sets.

• Only the elements present in the first set.

• Only the common elements from both sets.

How can you convert a set to a list in Java?

• By using the toList method.

• By using the listify method.

• By using the convert method.

• By using the addAll method on a list.

What does the intersection operation on two sets return?

• All elements from both sets.

• Only the elements unique to each set.

• An empty set.

• Only the common elements from both sets.