Java 8 features - class 33 - Collectors class -groupingBy() method and single level grouping
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Grouping Operation:-
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groupingBy() method:
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In Java 8, the concept of "grouping by" is often associated with the Collectors.groupingBy method, which is part of the java.util.stream package. This functionality allows you to group elements of a collection based on a specific criterion.
Basic Usage:
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Stream Creation: Start with a collection, like a List or a Set, and convert it into a stream.
Grouping: Use the Collectors.groupingBy() method to specify the criterion for grouping.
Result: The result is a Map where the keys are the values returned by the grouping function, and the values are lists of items that match each key.