Time flies! I remember the time when Java 8 was such a reference, and everybody was talking about it like something new and revolutionary. Frankly speaking, it was new and revolutionary. But now, projects using Java 8 might be labeled “legacy.” If Java 8 itself became a legacy, the features introduced in that version would still be actual. And let’s talk today about one of them — Stream API. 

In case you don’t know, Java Stream API is a powerful tool that allows programmers to write Java code in a functional programming style. Introduced long ago, it makes working with collections easier by enabling filtering, transformation, and aggregation. 

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