Converting List to Map in Java 8

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Summary: Learn how to efficiently convert a List to a Map using Java 8 streams and lambdas, providing a concise and elegant solution for mapping elements based on specific criteria.
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In Java 8, converting a List to a Map has become more streamlined and expressive thanks to the introduction of streams and lambda expressions. This approach allows developers to write concise code while maintaining readability and efficiency.

Let's explore a simple example to understand how to convert a List to a Map using Java 8 features. Suppose we have a list of objects of type Person, where each person has an ID and a name.

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In the toMap() collector, we specify two functions:

The key mapper function, which extracts the ID of each Person object using Person::getId.

The value mapper function, which simply returns the Person object itself.

Finally, we display the resulting map using a lambda expression within the forEach() method.

This concise and elegant solution demonstrates the power of Java 8 streams and lambdas in converting a List to a Map effortlessly.