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java.util.stream.Collectors public final class Collectors extends Object Implementations of Collector that implement various useful reduction operations, such as accumulating elements into collections, summarizing elements according to various criteria, etc.
- Overview
- The Stream.Collect() Method
- Collectors
- Custom Collectors
- Conclusion
- GeneratedCaptionsTabForHeroSec
In this tutorial, we’ll be going through Java 8’s Collectors, which are used at the final step of processing a Stream. To read more about Stream API itself, we can check out this article. If we want to see how to leverage the power of Collectors for parallel processing, we can look at this project.
Stream.collect() is one of the Java 8’s Stream API‘s terminal methods. It allows us to perform mutable fold operations (repackaging elements to some data structures and applying some additional logic, concatenating them, etc.) on data elements held in a Streaminstance. The strategy for this operation is provided via the Collectorinterface implement...
All predefined implementations can be found in the Collectorsclass. It’s common practice to use the following static import with them to leverage increased readability: We can also use single import collectors of our choice: In the following examples, we’ll be reusing the following list:
If we want to write our own Collector implementation, we need to implement the Collector interface, and specify its three generic parameters: 1. T– the type of objects that will be available for collection 2. A– the type of a mutable accumulator object 3. R– the type of a final result Let’s write an example Collector for collecting elements into an...
In this article, we explored in depth Java 8’s Collectors, and showed how to implement one. Make sure to check out one of my projects that enhances the capabilities of parallel processing in Java. All code examples are available on the GitHub. More interesting articles can be read on my site.
Learn how to use Java 8's Collectors to perform mutable fold operations on Stream elements and collect them into various data structures. See examples of toList, toSet, toMap, groupingBy, joining, and more collectors.
19. Juli 2020 · Learn how to use Collectors class in Java Stream API to perform various operations on collections. See examples of toList, toSet, toMap, toCollection and more methods with City class.
8. Jan. 2024 · Learn how to use the toMap () method of the Collectors class to transform Streams into different Map implementations. See examples of key mapping, value mapping, merge function, and map supplier.
29. März 2023 · Learn how to use Collectors.reducing() to perform reduction operations on streams of elements. See different overloads, examples, and applications of reducing() with groupingBy() and partitioningBy().
24. Okt. 2023 · Learn how to use the collectingAndThen() method to perform a final transformation on the result of a collector. See examples, diagrams, and explanations of when and how to apply this method in Java 8 streams.
