Java Reactive Programming: A Step-by-Step Guide

Reactive Programming in Java is a paradigm that revolves around asynchronous, event-driven data streams. To fully understand and utilize this approach, let’s break it down step-by-step, covering types, methods, and practical examples.

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1. Core Types in Java Reactive Programming

Reactive programming in Java is primarily implemented using libraries like RxJava and Project Reactor, which follow the Reactive Streams Specification. The core types in these libraries are designed to work with streams of data and include the following:

a. Publisher

• The Publisher is a provider of a potentially unbounded number of data items.
• It notifies a Subscriber whenever data is available.
• Examples: Flux and Mono in Project Reactor.

b. Subscriber

• The Subscriber consumes data emitted by the Publisher.
• It has four main methods: onSubscribe, onNext, onError, and onComplete.