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Teeing, a Hidden Gem in The Java API We can replace our custom Collector with two simple Collector implementations, one aggregating price rows and the other summing the cart's price. by Last week, I described a use-case for a custom Stream Collector. I received a intriguing comment on Twitter: Hats off to you, Miguel! Your comment revealed a method I didn't know! So I decided to investigate what is the teeing() method about. Returns a Collector that is a composite of two downstream collectors. Every element passed to the resulting collector is processed by both downstream collectors, then ...

A Real-World Example of a Stream Collector See how Stream Collectors work in the wild. by Java Stream's Collection or a scalar. For the former, you use one of the toXXX() method, for the latter, one of the reducing() one. Let's imagine an e-commerce platform that implements a shopping cart. The cart is modeled as the following: This diagram might translate into the following (abridged) code: Java 4 5 6 8 15 4 6 10 11 14 18 22 Produ...