Web Reference: We create a stream of Widget objects via Collection.stream(), filter it to produce a stream containing only the red widgets, and then transform it into a stream of int values representing the weight of each red widget. 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. A stream represents a sequence of elements supporting sequential and parallel operations. Unlike collections, a stream does not store data. Instead, it conveys elements from a source such as a collection, an array, or an I/O channel through a pipeline of computational operations.
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