深入学习Kotlin编程无水印原版PDF指南

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"《编程 Kotlin》是一本深入指南，由 Stephen Samuel 和 Stefan Bocutiu 联合编写，旨在帮助读者熟悉 Kotlin 的所有特性和功能。这本书是 2017 年由 Packt Publishing 出版，享有版权，未经许可禁止任何形式的复制、存储或传输。它在准备过程中已尽力确保信息的准确性，但所有内容均以无担保形式提供，作者和出版社不对因本书导致的直接或间接损失承担责任。《编程 Kotlin》的出版日期为 2017 年 1 月，生产参考编号为 1130117。该书可能包含对行业内公司的商标信息，但 Packt Publishing 不能保证这些信息的绝对准确。读者可以通过在美国亚马逊官网搜索这本书来获取更详细的内容和购买选项。作为一本专业级的 IT 学术著作，它不仅讲解 Kotlin 语言的基础知识，还涵盖了高级特性、最佳实践以及可能的应用场景。内容包括但不限于类和对象、函数式编程、多线程处理、异常处理、接口和注解、单元测试，以及如何将 Kotlin 与 Java 互操作，以利用其在现代软件开发中的优势。学习这本书，开发者可以提升自己的编程技能，了解 Kotlin 如何简化代码、提高可读性和可维护性，特别是在 Android 开发和服务器端应用中的广泛应用。无论是初次接触 Kotlin 还是希望进一步深化理解的开发者，都能从中受益匪浅。通过阅读这本书，读者将能够熟悉并掌握 Kotlin 这一强大而灵活的现代化编程语言。"

[ viii ]

Chapter 13: Concurrency

361

Threads

361

Blocking

363

Creating a thread 363

Stopping a thread 364

Thread interrupts 366

CPU-bound versus I/O-bound 367

Deadlocks and livelocks

368

Dining philosophers problem

369

Executors

370

Race conditions

371

Monitors

373

Locks

375

Read-write locks 376

Semaphores

377

The bounded buffer problem 377

Concurrent collections

380

ConcurrentHashMap 381

A blocking queue 381

Atomic variables

382

CountDownLatch

383

Cyclic Barrier

385

Non-blocking I/O and asynchronous programming

387

Futures

388

Summary

390

Index

391

Preface

Kotlin is typically associated with Android development, and most discussion about it

revolves gravitates around that. But the language has much more to offer and is ideal for

modern server side developers. While any Android developer will find useful snippets in

this book, the book is targeting Java and Scala developers primarily. The book will start

with a introduction to Kotlin and explain how you set up your environment before moving

on to the basic concepts. Once the basics are out of the way, the focus will shift towards

more advanced concepts, and don't be surprised if you see a few bytecode listings. Once

you have completed the book you should have all the knowledge required to start using

Kotlin for your next project.

What this book covers

Chapter 1, Getting Started with Kotlin, covers how to install Kotlin, the Jetbrains Intellij

IDEA, and the Gradle build system. Once the setup of the tool chain is complete, the

chapter shows how to write your first Kotlin program.

Chapter 2, Kotlin Basics, dives head first into the basics of Kotlin, including the basic types,

basic syntax, and program control flow structures such as if statements, for loops, and

while loops. The chapter concludes with Kotlin-specific additions such as when expressions

and type inference.

Chapter 3, Object-Oriented Code in Kotlin, focuses on the object-orientated aspects of the

language. It introduces classes, interfaces, objects and the relationship between them,

subtypes, and polymorphism.

Chapter 4, Functions in Kotlin, shows that functions, also known as procedures or methods,

are the basic building blocks of any language. This chapter covers the syntax for functions,

including the Kotlin enhancements such as named parameters, default parameters, and

function literals.

Chapter 5, Higher Order Functions and Functional Programming, focuses on the functional

programming side of Kotlin, including closures--also known as lambdas--and function

references. It further covers functional programming techniques such as partial application,

function composition, and error accumulation.

Preface

[ 2 ]

Chapter 6, Properties, explains that properties work hand in hand with object-orientated

programming to expose values on a class or object. This chapter covers how properties

work, how the user can best make use of them, and also how they are represented in the

bytecode.

Chapter 7, Null Safety, Reflection, and Annotations, explains that null safety is one of the main

features that Kotlin provides, and the first part of this chapter covers in depth the whys and

hows of null safety in Kotlin. The second part of the chapter introduces reflection--run time

introspection of code--and how it can be used for meta programming with annotations.

Chapter 8, Generics, explains that generics, or parameterized types, are a key component of

any advanced type system, and the type system in Kotlin is substantially more advanced

than that available in Java. This chapter covers variance, the type system including the

Nothing type, and algebraic data types.

Chapter 9, Data Classes, shows that immutability and boiler-plate free domain classes are a

current hot topic, due to the way they facilitate more robust code and simplify concurrent

programming. Kotlin has many features focused on this area, which it calls data classes.

Chapter 10, Collections, explains that collections are one of the most commonly used aspects

of any standard library, and Java collections are no different. This chapter describes the

enhancements that Kotlin has made to the JDK collections, including functional operations

such as map, fold, and filter.

Chapter 11, Testing in Kotlin, explains that one of the gateways into any new language is

using it as a language for writing test code. This chapter shows how the exciting test

framework KotlinTest can be used to write expressive, human-readable tests, with much

more power than the standard jUnit tests allow.

Chapter 12, Microservices in Kotlin, shows that microservices have come to dominate server-

side architecture in recent years, and Kotlin is an excellent choice for writing such services.

This chapter introduces the Lagom microservice framework and shows how it can be used

to great effect with Kotlin.

Chapter 13, Concurrency, explains that as multi-core aware programs are becoming more

and more important in server-side platforms, This chapter is focused on a solid introduction

to concurrent programming techniques that are vital in modern development, including

threads, concurrency primitives, and futures.

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