Core Java Programming Course- Hash Map

The video tutorial explains the concept of HashMap in Java, detailing its implementation as a key-value pair data structure similar to a dictionary. It covers creating a HashMap, adding, retrieving, updating, and removing entries, and using operations like 'contains key'. The tutorial also demonstrates converting a HashMap into sets of keys, values, and entries, and concludes with a summary of the discussed operations.

What is a HashMap and how does it store data?

Explain how to create a HashMap object in Java.

How do you add values to a HashMap?

What happens when you try to retrieve a value using a key that does not exist in the HashMap?

Describe the 'containsKey' operation in a HashMap.

How can you update an existing value in a HashMap?

What methods can be used to remove entries from a HashMap?