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Java Stream API Overview

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Core Concepts: Java Stream API provides functional processing of collections of objects
Streams can be obtained from Java Collections using stream() method
Streams can be processed using listeners that form a chain
Operations: Non-terminal operations transform or filter elements, returning new streams
Terminal operations start internal iteration and return results
Common operations include map(), filter(), distinct(), limit()
Terminal operations include anyMatch(), allMatch(), noneMatch()
API Critique: Java Stream API is not truly streaming, only batch processing
Streams are designed as chains, not graphs
Terminal operations are limited to single final operation
Internal iteration is deliberately hidden from users
Alternative Approaches: Apache Kafka Streams uses graph-based processing structure
Graph-based APIs support multiple final operations
Graph-based APIs allow elements to be passed through entire graph