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Java 9 Concurrency Cookbook, Second Edition
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A stream is a sequence of data that allows you to apply a sequence of operations (usually represented with lambda expressions) to it in a sequential or parallel way in order to filter, transform, sort, reduce, or construct a new data structure. It was introduced in Java 8 and was one of the most important features introduced in that version.
Streams are based on the Stream
interface and some related classes and interfaces included in the java.util.stream
package. They have also provoked the introduction of new methods in a lot of classes to generate streams from different data structures. You can create a Stream
interface from every data structure that implements the Collection
interface: from File
, Directory
, Array
, and a lot of other sources.
Java also included different mechanisms to create streams from your own sources. The most important ones are:
Supplier
interface: This interface defines the get()
method. It will be called by Stream
when it...