Implementing Map Interface

This lecture covers the concept of HashMap in Java, focusing on its key-value pair structure. It compares HashMap with ArrayList, highlighting differences in indexing. A practical example demonstrates how to use HashMap, including adding, retrieving, and removing entries. The lecture also explains the use of entry sets for iterating over HashMap entries and how to cast entries to separate keys and values. The session concludes with a discussion on converting HashMap to a set and iterating through it.

What is an entry set in the context of a hash map?

How do you iterate through the entries of a hash map?

How can you separate keys and values when retrieving them from a hash map?

What is the significance of casting to a map entry when iterating through a hash map?