FutureValue.Collector that returns any CompletionStage result.Collector that returns any CompletionStage result.Collector that finds the single element of a stream, or Optional.empty() if the stream is empty.Collector that finds the single element of a stream, or Optional.empty() if the stream is empty.Collector that finds a unique element of a stream, or Optional.empty() if the stream is empty.Collector that finds the unique element of a stream, or Optional.empty() if the stream is empty.FutureValue instance into another.CompletionStage instances inside streams.Copyright © 2021–2022. All rights reserved.