ReactiveX?
ReactiveX is Functional Programming and base on Observable Pattern and Iterator Pattern. It is also known as Reactive programming. It supply asynchronous data flow or data stream. It especially become events important. Events is react when other events changed. This is, for example, network calls, user touch input, and announce in mail etc.
RxJava?
ReactiveX exist a lot of library(RxJava, RxJS, RxKotlin, Rx.rb etc...). I want to introduce by using RxJava. To port .NET Rx to the JVM, RxJava is created by Netflix in 2012. Netflix showed by a post of Ben Christensen and Jafar Husain for the first time -- maybe this.
Link
Coming soon...