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Retrieving a value by key

To retrieve a value from the map, use the get() method, which takes the key as its argument.

Below is an example of a map that contains products and their prices, and how to use the get() method to retrieve the price of 'MacBook'.

In the above example:

The keyword Map is used to declare a map which can hold key value pairs.
The key is string and value is an integer.
The get() method retrieves the value associated with a key. If the key doesn't exist, it returns null.

A map key can hold the null value