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Collections in Java

HashMap: Updation and Removal

Explore how to fetch, update, and remove elements in a Java HashMap. Learn to use methods like get(), getOrDefault(), replace(), and remove() to manage key-value pairs and apply functional updates for efficient collection handling.

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Fetching an element from a HashMap

There are two ways to get an element from a HashMap.

Using the get() method

The get(Object key) method takes a key as a parameter and returns the value corresponding to that key. If the key is not present, it returns null.

Using the getOrDefault() method

The getOrDefault(Object key, V defaultValue) method is useful if are not sure whether a key is present in the Map or not. If the key is present then this method returns the value corresponding to the key and ...