现代Java编程实践：解决Java 8和9中的复杂问题

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"OReilly Modern Java Recipes 2017.8" 本书《Modern Java Recipes》由Ken Kousen撰写，旨在提供针对Java 8和9的简单解决方案来应对复杂的编程问题。这本书由O'Reilly Media, Inc.出版，版权归属Ken Kousen所有。书中涵盖了一系列关于Java开发的实用技巧和最佳实践，适用于教育、商业以及销售推广用途。在Java 8和9这两个版本中，引入了许多新的特性和改进，如lambda表达式、函数式编程、Stream API、日期与时间API（java.time包）、默认方法（接口中的实现）以及模块系统（Jigsaw项目）。这本书将深入探讨这些特性，帮助开发者更高效地利用这些工具解决问题。编辑团队包括Brian Foster和Jeff Bleiel，以及生产编辑Justin Billing，确保了书籍内容的高质量。此外，还有一系列专业人员负责校对、索引和设计工作，以提供一个专业且易读的阅读体验。书中可能包含的技术点有： 1. **Lambda表达式**：这是一种简洁的匿名函数表示方式，使得代码更易于理解和维护。通过使用lambda，可以简化回调函数和处理集合的操作。 2. **函数式编程**：Java 8引入了对函数式编程的支持，允许开发者使用函数作为一等公民，即函数可以被赋值、传递和存储。这极大地提高了代码的可读性和复用性。 3. **Stream API**：这是一个用于处理集合的新API，提供了流水线式的操作，使得数据处理更为高效，如过滤、映射和归约等操作。 4. **日期与时间API**：取代了过时的java.util.Date和Calendar类，新的java.time包提供了更强大、更直观的时间日期处理功能，如LocalDate、LocalTime、LocalDateTime和ZonedDateTime等。 5. **默认方法**：在接口中可以定义默认实现，允许接口在不破坏向后兼容性的前提下添加新方法。 6. **模块系统**：Jigsaw项目引入了模块化概念，有助于大型项目的构建和管理，提升了应用的可维护性和性能。书中每个章节都会围绕一个特定主题展开，提供一个实际问题，然后展示如何使用上述新特性来解决这个问题。作者Ken Kousen通过实例代码和解释，帮助读者掌握这些现代Java技术，从而提高开发效率和代码质量。如果你是Java开发者，无论是新手还是经验丰富的老手，这本书都是一个很好的资源，它能帮助你充分利用Java 8和9的最新特性，提升你的编程技巧。对于那些想要更新技能库或了解现代Java最佳实践的人来说，这是一本不容错过的指南。

2 Yes, I too wish that the Java 9 chapter had been Chapter 9, but it didn’t seem right to reorder the chapters just

for that accidental symmetry. This footnote will have to suffice.

can fill an entire book by themselves, but the basics are clear and are described in

this chapter. Other recipes cover private methods in interfaces, the new methods

added to streams, collectors, and Optional, and how to create a stream of dates.

• Appendix A, Generics and Java 8, is about the generics capabilities in Java. While

generics as a technology was added back in 1.5, most developers only learned the

minimum they needed to know to make them work. One glance at the Javadocs

for Java 8 and 9 shows that those days are over. The goal of the appendix is to

show you how to read and interpret the API so you understand the much more

complex method signatures involved.

The chapters, and indeed the recipes themselves, do not have to be read in any partic‐

ular order. They do complement each other and each recipe ends with references to

others, but you can start reading anywhere. The chapter groupings are provided as a

way to put similar recipes together, but it is expected that you will jump from one to

another to solve whatever problem you may have at the moment.

Conventions Used in This Book

The following typographical conventions are used in this book:

Italic

Indicates new terms, URLs, email addresses, filenames, and file extensions.

Constant width

Used for program listings, as well as within paragraphs to refer to program ele‐

ments such as variable or function names, databases, data types, environment

variables, statements, and keywords.

Constant width bold

Shows commands or other text that should be typed literally by the user.

Constant width italic

Shows text that should be replaced with user-supplied values or by values deter‐

mined by context.

This element signifies a tip or suggestion.

xiv | Preface

3 Gradle Recipes for Android, also from O’Reilly Media, all about the Gradle build tool as it is applied to

Android projects.

I have now been giving presentations on the new functional features of Java for a cou‐

ple of years. By the Fall of 2016 I had completed my last book,

and since the idea was

to write another recipes book for the same publisher I foolishly thought the project

would be easy.

Noted science fiction author Neil Gaiman famously once said that after finishing

American Gods he thought he knew how to write a novel. His friend corrected him,

saying he now knew how to write this novel. I now understand what he meant. The

original proposal for this book anticipated about 25 to 30 recipes spanning about 150

pages. The final result you hold in your hand has more than 70 recipes filling nearly

300 pages, but the larger scope and greater detail has produced a much more valuable

book than I intended.

Of course, that’s because I had lots of help. The aforementioned Venkat Subramaniam

has been extremely helpful, both through his talks, his other books, and private dis‐

cussions. He also was kind enough to be a technical reviewer on this book, so any

remaining errors are all his fault. (No, they’re mine, but please don’t tell him I admit‐

ted that.)

I also am very grateful to have had the frequent assistance of Tim Yates, who is one of

the best coders I’ve ever met. I knew him from his work in the Groovy community,

but his versatility goes well beyond that, as his Stack Overflow rating will show. Rod

Hilton, who I met while giving Java 8 presentations on the NFJS tour, was also kind

enough to offer a review. Both of their recommendations have been invaluable.

I have been fortunate enough to work with the excellent editors and staff at O’Reilly

Media over the course of two books, over a dozen video courses, and many online

training classes delivered on their Safari online platform. Brian Foster has been a con‐

stant source of support, not to mention his almost magical ability to cut through

bureaucracy. I met him while writing my previous book, and though he wasn’t the

editor of this one, his help and friendship have been very valuable to me throughout

the process.

My editor, Jeff Bleiel, was very understanding as the book doubled in length, and pro‐

vided the structure and organization needed to keep making progress. I’m very glad

we got to work together and hope we will continue to do so in the future.

I need to acknowledge many of my fellow speakers on the NFJS tour, including Nate

Schutta, Michael Carducci, Matt Stine, Brian Sletten, Mark Richards, Pratik Patel,

Neal Ford, Craig Walls, Raju Gandhi, Kirk Knoernschild, Dan “the Man” Hinojosa,

and Janelle Klein for their constant perspective and encouragement. Both writing

books and teaching training classes (my actual day job) are solitary pursuits. It’s great

Preface | xvii

剩余320页未读，继续阅读

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