Introducing Java 8

A Quick-Start Guide to Lambdas and Streams

Introducing Java 8

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Java SE 8 is perhaps the largest change to Java in its history, led by its flagship feature—lambda expressions. If you’re an experienced developer looking to adopt Java 8 at work, this short guide will walk you through all of the major changes before taking a deep dive into lambda expressions and Java 8’s other big feature: the Streams API.

Author Raoul-Gabriel Urma explains how improved code readability and support for multicore processors were the prime movers behind Java 8 features. He’ll quickly get you up to speed on new classes including CompleteableFuture and Optional, along with enhanced interfaces and the new Date and Time API. You’ll also:

  • Understand why lambda expressions are considered a kind of anonymous function
  • Learn how lambda expressions and the behavior parameterization pattern let you write flexible and concise code
  • Discover various operations and data processing patterns possible when using the Streams API
  • Use Collector recipes to write queries that are more sophisticated
  • Consider factors such as data size and the number of cores available when using streams in parallel
  • Work with a practical refactoring example to bring lambda expressions and streams into focus

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Raoul-Gabriel Urma

Raoul-Gabriel Urma is an author of the bestselling book “Java 8 in Action” (Manning). He has worked as a software engineer for Oracle’s Java Platform Group, as well as for Google’s Python team, eBay, and Goldman Sachs. An instructor and frequent conference speaker, he’s currently completing a PhD in Computer Science at the University of Cambridge. He is also co-founder of Cambridge Coding Academy and a Fellow of the Royal Society of Arts. In addition, Raoul-Gabriel holds a MEng in Computer Science from Imperial College London and graduated with first-class honors, having won several prizes for technical innovation. You can find out more about Raoul-Gabriel’s projects on his website and on Twitter @raoulUK. You can find out more about his book "Java 8 in Action" here