Java LongStream is a stream type in Java that handles sequences of Java long values. It provides methods for performing functional-style operations such as filtering, mapping, and reducing on long values, similar to Java IntStream and Java DoubleStream. Introduced in Java 2014 with Java 8, LongStream is part of Java's java.util.stream package and is particularly useful when working with large sets of numerical data in a functional programming style.

https://docs.oracle.com/javase/8/docs/api/java/util/stream/LongStream.html