Web Reference: A sequence of elements supporting sequential and parallel aggregate operations. The following example illustrates an aggregate operation using Stream and IntStream: int sum = widgets.stream() .filter(w -> w.getColor() == RED) .mapToInt(w -> w.getWeight()) .sum(); In this example, widgets is a Collection. We create a stream of Widget objects via Collection.stream(), filter it to produce ... Sep 12, 2025 · Java 8 introduced the Stream API, which allows developers to process collections of data in a functional and declarative way. Streams make it easier to perform operations such as filtering, mapping, reducing and collecting data without writing complex loops. Oct 5, 2023 · The article is an example-heavy introduction of the possibilities and operations offered by the Java 8 Stream API.
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