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 ... May 3, 2024 · This short tutorial discussed how to filter a Map by keys, values or both using the Java 8 stream API. These generic functions can help you to extract the common functionality in utility methods thus making the code more clean and maintainable. Feb 23, 2016 · This article shows a few examples of filtering a `Map` by its keys or values using the Java 8 stream APIs.
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