Java 9 Concurrency Cookbook - Second Edition

Using streams to process big data sets

A Stream interface is a sequence of elements that can be filtered and transformed to get a final result sequentially or in parallel. This final result can be a primitive data type (an integer, a long ...), an object or a data structure. These are the characteristics that better define Stream:

• A stream is a sequence of data, not a data structure.
• You can create streams from different sources as collections (lists, arrays...), files, strings, or a class that provides the elements of the stream.
• You can't access an individual element of the streams.
• You can't modify the source of the stream.
• Streams define two kinds of operations: intermediate operations that produce a new Stream interface that allows ...