Implementing Set Interface

The video tutorial explains the Set interface in Java, focusing on HashSet, TreeSet, and LinkedHashSet. It highlights the key differences between Set and List interfaces, particularly the non-acceptance of duplicate values in Set. The tutorial provides examples to illustrate when to use Set or List, such as in e-commerce scenarios. It also discusses the lack of guaranteed order in Set elements compared to ArrayList. A demonstration of HashSet is provided, showcasing its methods like add, remove, and checking for duplicates. The tutorial concludes with a brief mention of the Iterator interface, which will be covered in the next lecture.

What is a key characteristic of the Set interface?

• It does not allow duplicate values.

• It is faster than List.

• It maintains the order of elements.

• It allows duplicate values.

In which scenario would you prefer using a List over a Set?

• When you need to store unique elements only.

• When you need to maintain the order of elements.

• When you need to prevent duplicate entries.

• When you need to store elements in a random order.

Why might a Set not be suitable for storing items in a shopping cart?

• Because it is slower than a List.

• Because it maintains the order of items.

• Because it does not allow duplicate items.

• Because it requires more memory.

What is a limitation of the Set interface compared to the List interface?

• Set is slower in adding elements.

• Set allows duplicate values.

• Set does not provide index-based access.

• Set maintains the order of elements.

How are elements stored in a Set?

• In a sequential order.

• In a reverse order.

• In a sorted order.

• In a random order.

Which method is not available in HashSet?

• add()

• remove()

• get()

• contains()

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

• An error is thrown.

• The duplicate element replaces the existing one.

• The duplicate element is added.

• The duplicate element is ignored.