In today's app-driven era when programs are asynchronous & responsiveness is so vital reactive programming can help you write code that's more reliable easier to scale & better-performing With this practical book Java developers will first learn how to view problems in the reactive way & then build programs that leverage the best features of this exciting new programming paradigm Authors Tomasz Nurkiewicz & Ben Christensen include concrete examples that use the Rx Java library to solve real-world performance issues on Android devices as well as the server You'll learn how Rx Java leverages parallelism & concurrency to help you solve today's problems This book also provides a preview of the upcoming 20 release Write programs that react to multiple asynchronous sources of input without descending into callback hell Get to that aha! moment when you understand how to solve problems in the reactive way Cope with Observables that produce data too quickly to be consumed Explore strategies to debug & to test programs written in the reactive style Efficiently exploit parallelism & concurrency in your programs Learn about the transition to Rx Java version 2