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The All-in-One Guide to Java Programming

Grouping and Partitioning

Explore the use of Java 8's groupingBy and partitioningBy collectors to categorize elements in streams. Learn how to apply these for grouping by keys or boolean conditions, and perform parallel grouping with groupingByConcurrent for efficient data processing.

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Introduction to grouping and partitioning

The groupingBy collector groups elements based on a function we provide. For example:

List<Dragon> dragons = getDragons();
Map<Character,List<Dragon>> map = dragons.stream()
...