Скачать или смотреть Java Stream API: Collecting and Transforming Data using collectingAndThen

In Java, Collectors.collectingAndThen is a powerful Collector used in stream operations to transform the result of another Collector. It wraps another Collector, performing an additional finishing transformation. This is particularly useful for immutable collections or applying final adjustments to the collection result, ensuring a versatile approach to stream reductions.

This example demonstrates using Collectors.collectingAndThen to collect names into a list and then converting that list into an unmodifiable list. It shows how to achieve immutability in collections resulting from stream operations, illustrating both the collection process and the enforcement of collection immutability.


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