HashMap Introduction

 HashMap is a class in the java.utils package that implements the Map interface.It is used to store the key-value pair.

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Creating a HashMap

Map<String, Integer> map = new HashMap<>();

Inserting into a HashMap

Using the put() method

Using the putIfAbsent() method

Using the putAll() method

hashmap java

Fetching an element from a HashMap

Using the get() method

Using the getOrDefault() method

hashmap java kotlin

Additional operations on HashMap


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