HashMap: Operations
Explore the fundamental operations of the HashMap in Java. Understand how to check if a key exists, retrieve all keys or values, and determine if the HashMap is empty. This lesson helps you manage and utilize HashMaps efficiently within the Java Collections Framework.
Operations on HashMap
Checking if a key is present in the HashMap
We can use the containsKey(Object key) method to check if a given key is present in the HashMap. This method returns true ...