August 2014
Intermediate to advanced
424 pages
13h 50m
English
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Chapter 6. Collecting data with streams
This chapter covers
- Creating and using a collector with the Collectors class
- Reducing streams of data to a single value
- Summarization as a special case of reduction
- Grouping and partitioning data
- Developing your own custom collectors
You learned in the previous chapter that streams help you process collections with database-like operations. You can view Java 8 streams as fancy lazy iterators of sets of data. They support two types of operations: intermediate operations such as filter or map and terminal operations such as count, findFirst, forEach, and reduce. Intermediate operations can be chained to convert a stream into another stream. These operations don’t consume from a stream; their purpose ...
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