5 Custom Java Collector Patterns That Replace Complex Stream Reduction Code

This article discusses five custom Java Collector patterns that simplify complex stream reduction code. It explains the four jobs of a collector (supplier, accumulator, combiner, and finisher) and how to implement them. The article provides an example of a simple statistics collector that calculates count, sum, minimum, and maximum from a stream of numbers. This pattern can be used as a foundation for more complex aggregations.