... calls in lines 9–10 create a stream pipeline. A stream is a sequence of elements on which you perform tasks, and the stream pipeline moves the stream’s elements through a sequence of tasks (or processing steps).

Specifying the Data Source

A stream pipeline typically begins with a method call that creates the stream—this is known as the data source. Line 9 specifies the data source with the method call

IntStream.rangeClosed(1, 10)

which creates an IntStream representing an ordered range of int values. ...

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