Examples of HashSet Using Iterator

The video tutorial explains how to iterate through a hash set in Java using the Iterator interface. It covers the basics of creating an Iterator object, using the next() method to traverse elements, and employing a while loop with the hasNext() method for efficient iteration. The tutorial also highlights key differences between List and Set collections, emphasizing that Lists allow duplicates and maintain order, while Sets do not. This knowledge is particularly useful in automation testing scenarios like Selenium.

What is the primary purpose of the Iterator interface in Java?

• To add elements to a set

• To remove duplicates from a set

• To traverse through each object in a set

• To sort elements in a set

In the example provided, what does the 'next' method do?

• It removes the current element

• It adds a new element

• It moves the iterator to the next element

• It resets the iterator to the start

Why is using 'next' repeatedly to access elements in a set considered inefficient?

• It can skip elements randomly

• It can only access the first element

• It requires knowing the exact number of elements

• It does not guarantee the order of elements

What does the 'hasNext' method check for in a set?

• If the set is empty

• If there is a next element available

• If the current element is the last

• If the set contains duplicates

Which method is used to check if there are more elements to iterate over in a set?

• next()

• reset()

• hasNext()

• previous()

Which data structure allows duplicate values?

• Iterator

• HashSet

• List

• Set

What is a key difference between a list and a set?

• Lists do not allow duplicates, sets do

• Sets guarantee order, lists do not

• Lists allow duplicates, sets do not

• Sets are faster than lists