Grokking Java Intermediate
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Basics of HashMap Class

The HashMap class is one of the most commonly used implementations of the Map interface in Java. It stores data as key-value pairs, allowing you to quickly retrieve a value when you know its associated key. HashMap does not maintain any order for its entries, and it allows one null key and multiple null values. Its unsynchronized nature makes it fast in single-threaded scenarios, but if you need thread safety, you must manage it externally.

Syntax for Creating a HashMap

To create a HashMap, you use the following syntax:

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