Understanding the Java Streams Non-Concurrent Collector API

This video delves into Java Streams non-concurrent Collector API, highlighting its core components: generic types T, A, and R, and five key methods—characteristics(), supplier(), accumulator(), combiner(), and finisher(). The characteristics method provides optimization flags like UNORDERED and IDENTITY_FINISH. The supplier() factory method creates a Supplier object that initiates an empty result container, while the accumulator() factory method yields a BiConsumer that adds elements to this container. The combiner() factory method creates a BinaryOperator that merges two containers for parallel streams. Finally, the finisher() factory method returns a Function that transforms the accumulator into the final result, which can be optimized or made complex depending on the application.