Java 8入门指南：lambda表达式与流

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"《深入理解Java 8》是一本不可多得的好书，作者是Raoul-Gabriel Urma，专为那些希望快速掌握Java 8新特性的读者设计。本书的焦点在于Lambda表达式和Stream API，这两个特性在Java 8中引入了函数式编程的理念，极大地提高了代码的简洁性和可读性。通过本书，读者将学习到如何利用lambda表达式进行函数式编程实践，以及如何高效地处理集合数据和并行计算。章节标题“快速入门Lambda和流”将引导读者进入Java 8的核心创新，从基础概念到实际应用案例，让初学者能迅速上手。作者以易于理解的方式讲解了如何使用lambda语法、方法引用、函数式接口，以及如何构建和操作Stream来处理大量数据。这包括map、filter、reduce等操作符的使用，以及如何结合Java 8的并发库如 CompletableFuture，实现高效的并发处理。此外，书中还提供了多种学习和保持最新技术动态的途径。包括编程周报，每周向读者推送编程相关的新闻和内容，网址为oreilly.com/programming/newsletter。还有免费的在线Webcast系列讲座，邀请专家现场讲解热门编程话题，webcasts.oreilly.com是学习的宝库。O'Reilly Radar则提供深入的技术洞察和分析，radar.oreilly.com是了解新兴技术趋势的好去处。最后，书中还提及了O'Reilly举办的各类技术会议，conferences.oreilly.com，为参与者提供了沉浸式的学习体验。版权信息表明，本书由O'Reilly Media Inc.出版，所有权利受到保护。如果你是教育机构、企业或销售人员，O'Reilly的书籍也提供了购买选项，同时在线版本几乎涵盖了大部分图书。《深入理解Java 8》是一本全面而实用的指南，无论是对Java开发者的新手还是进阶者，都是提升编程技能、适应现代Java语言发展的绝佳资源。"

CHAPTER 1

Java 8: Why Should You Care?

Java has changed! The new version of Java, released in March 2014,

called Java 8, introduced features that will change how you program

on a day-to-day basis. But don’t worry—this brief guide will walk

you through the essentials so you can get started.

This first chapter gives an overview of Java 8’s main additions. The

next two chapters focus on Java 8’s main features: lambda expressions

and streams.

There were two motivations that drove the changes in Java 8:

• Better code readability

• Simpler support for multicore

Code Readability

Java can be quite verbose, which results in reduced readability.

In other words, it requires a lot of code to express a simple concept.

Here’s an example: say you need to sort a list of invoices in decreas‐

ing order by amount. Prior to Java 8, you’d write code that looks

like this:

Collections.sort(invoices, new Comparator<Invoice>() {

public int compare(Invoice inv1, Invoice inv2) {

return Double.compare(inv2.getAmount(), inv1.getAmount());

}

});

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