Java 24: Introducing the gather Method in java.util.stream

Date: 2025-03-28

Java 22 introduces the gather method (JEP 461) as a preview feature, significantly enhancing the Stream API. This method, utilizing the Gatherer interface, allows for custom intermediate stream operations, providing more flexible and expressive data transformations than previously possible with map and flatMap. Gatherer defines how elements are accumulated and transformed, offering fine-grained control over complex data manipulations. The article provides examples using gather to create fixed-size windows and sliding windows, showcasing its power and versatility. This is a valuable addition to Java, particularly for complex data processing scenarios.

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