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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 carts 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 didnt know! So I decided to investigate what is the teeing() method about. Returns a Collector that is a composite of two downstream collectors....

A Real-World Example of a Stream Collector See how Stream Collectors work in the wild. by Java Streams Collection or a scalar. For the former, you use one of the toXXX() method, for the latter, one of the reducing() one. Lets 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 ...