The Stream API
The Stream API is your best tool to process your in-memory data following a map/filter/reduce approach.
The tutorials in this series are listed below. They will guide you through all of the Stream API, starting at the basic concepts all the way to collector design and parallel streams.
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Processing Data in Memory Using the Stream APIImplementing the map-filter-reduce algorithm
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Adding Intermediate Operations on a StreamDeep-diving into the intermediate operations of the Stream API.
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Creating StreamsPatterns to create the stream you need.
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Reducing a StreamReducing streams with a binary operator.
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Adding a Terminal Operation on a StreamReducing a stream without the reduce method.
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Finding the Characteristics of a StreamUnderstanding the characteristics of a stream
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Using a Collector as a Terminal OperationCollecting a stream in a mutable container using a collector.
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Creating Your Own CollectorCreating a collector by using the Collectors factory class.
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Implementing the Collector InterfaceCreating a collector by implementing the Collector interface.
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Using OptionalsIntroducing the Optional class to model methods that cannot always produce a value.
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Parallelizing StreamsGoing faster by leveraging parallel streams.
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The Gatherer APIImplementing your own intermediate operations with the Gatherer API