Web Reference: Nov 10, 2025 · Learn the key concepts of the Stream.reduce () operation in Java and how to use it to process sequential and parallel streams. Aug 28, 2024 · In Java, the Stream.reduce() method is used to perform a reduction on the elements of a stream using an associative accumulation function and returns an Optional. It is commonly used to aggregate or combine elements into a single result, such as computing the maximum, minimum, sum, or product. The Stream.reduce method is a general-purpose reduction operation. Consider the following pipeline, which calculates the sum of the male members' ages in the collection roster.
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