https://grokonez.com/java/java-8/how-to-use-java-8-stream-collectors-groupingby-examples
How to use Java 8 Stream Collectors.groupingBy() Examples
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In the tutorial, Grokonez will show how to use Grouping By APIs of Java Stream Collectors by examples:
- Explore Stream GroupingBy Signatures
- Combine groupingBy API with others Reduction Operations
Now let's do more details!
Related posts:
Stream GroupingBy Signatures
1. groupingBy(classifier)
public static Collector>> groupingBy(Function super T,? extends K> classifier)
-> It returns a Collector implementing a group by
operation on input elements of type T,
grouping elements according to a classifier
function, and returning the results in a Map.
- Type Parameters:
- T - the type of the input elements
K - the type of the keys
Parameters:
classifier: the classifier function mapping input elements to keys
Returns: a Collector implementing the cascaded group-by operation
Example:
More at:
https://grokonez.com/java/java-8/how-to-use-java-8-stream-collectors-groupingby-examples
How to use Java 8 Stream Collectors.groupingBy() Examples
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