Java 9问题解决方案实战：第三版

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"Apress.Java.9.Recipes.A.Problem-Solution.Approach.3rd.Edition.2017"是一本专门针对Java 9编程的实用指南，由知名作者Josh Juneau编撰。这本书采用问题解决的方法，提供了一套全面且深入的解决方案，适合于Java开发者在升级到Java 9版本时参考，或者在处理日常开发中的各种技术挑战时寻求帮助。本书的核心内容围绕Java 9的新特性和功能展开，包括但不限于模块化系统（Module System）、JShell（即时交互式编程环境）、改进的垃圾回收机制、新的Lambda表达式和Stream API优化等。通过一系列"Recipe"（菜谱）形式的章节，读者可以快速学习和理解如何将这些新特性融入到实际项目中，提升代码质量和开发效率。每章都聚焦一个具体的问题或任务，并详细展示了如何使用Java 9的相关技术来解决。这种问题导向的学习方式使得理论知识与实践应用紧密结合，有助于读者迅速掌握新知识并转化为实际操作技能。此外，书中还包含了版权信息，强调所有内容受版权保护，禁止未经许可的复制、重印、传播或任何形式的电子改编。对于图书馆和资料库，该书的ISBN-13（纸质版：978-1-4842-1975-1，电子版：978-1-4842-1976-8）以及Library of Congress Control Number (2017943502) 是识别本书的重要标识。版权信息表明，本书由Josh Juneau在2017年创作，所有权利归作者所有。 "Apress.Java.9.Recipes.A.Problem-Solution.Approach.3rd.Edition.2017"是一本既适合Java新手了解Java 9基础知识，也适合经验丰富的开发者深入探索和实践新技术的专业书籍。通过阅读这本书，读者能够紧跟Java语言的发展步伐，提高编程技能，应对不断变化的技术挑战。

■ Contents

xvi

5-8. Constructing Instances of the Same Class with Different Values ......................... 112

Problem .............................................................................................................................................. 112

Solution...............................................................................................................................................112

How It Works .......................................................................................................................................115

5-9. Interacting with a Class via Interfaces .................................................................. 116

Problem .............................................................................................................................................. 116

Solution...............................................................................................................................................116

How It Works .......................................................................................................................................116

5-10. Making a Class Cloneable ................................................................................... 117

Problem .............................................................................................................................................. 117

Solution...............................................................................................................................................117

How It Works .......................................................................................................................................121

5-11. Comparing Objects ............................................................................................. 121

Problem .............................................................................................................................................. 121

Solution 1............................................................................................................................................121

Solution 2............................................................................................................................................122

How It Works .......................................................................................................................................125

5-12. Extending the Functionality of a Class ................................................................ 126

Problem .............................................................................................................................................. 126

Solution...............................................................................................................................................126

How It Works .......................................................................................................................................129

5-13. Deﬁning a Template for Classes to Extend.......................................................... 129

Problem .............................................................................................................................................. 129

Solution...............................................................................................................................................129

How It Works .......................................................................................................................................130

5-14. Increasing Class Encapsulation .......................................................................... 131

Problem .............................................................................................................................................. 131

Solution...............................................................................................................................................131

How It Works .......................................................................................................................................134

Summary ...................................................................................................................... 136

■ Contents

xvii

■Chapter 6: Lambda Expressions �� 137

6-1. Writing a Simple Lambda Expression ................................................................... 137

Problem .............................................................................................................................................. 137

Solution...............................................................................................................................................137

How It Works .......................................................................................................................................138

6-2. Enabling the Use of Lambda Expressions ............................................................. 140

Problem .............................................................................................................................................. 140

Solution 1............................................................................................................................................140

Solution 2............................................................................................................................................140

How It Works .......................................................................................................................................141

6-3. Invoking Existing Methods by Name ..................................................................... 143

Problem .............................................................................................................................................. 143

Solution...............................................................................................................................................144

How It Works .......................................................................................................................................145

6-4. Sorting with Fewer Lines of Code ......................................................................... 147

Problem .............................................................................................................................................. 147

Solution 1............................................................................................................................................148

Solution 2............................................................................................................................................148

How It Works .......................................................................................................................................149

6-5. Filtering a Collection of Data ................................................................................. 149

Problem .............................................................................................................................................. 149

Solution...............................................................................................................................................150

How It Works .......................................................................................................................................150

6-6. Implementing Runnable ........................................................................................ 150

Problem .............................................................................................................................................. 150

Solution...............................................................................................................................................150

How It Works .......................................................................................................................................151

6-7. Replacing Anonymous Inner Classes .................................................................... 151

Problem .............................................................................................................................................. 151

Solution...............................................................................................................................................151

How It Works .......................................................................................................................................152

■ Contents

xviii

6-8. Accessing Class Variables from a Lambda Expression ......................................... 153

Problem .............................................................................................................................................. 153

Solution...............................................................................................................................................153

How It Works .......................................................................................................................................154

6-9. Passing Lambda Expressions to Methods ............................................................ 155

Problem .............................................................................................................................................. 155

Solution...............................................................................................................................................155

How It Works .......................................................................................................................................157

Summary ...................................................................................................................... 157

■Chapter 7: Data Sources and Collections �� 159

7-1. Deﬁning a Fixed Set of Related Constants ............................................................ 159

Problem .............................................................................................................................................. 159

Solution...............................................................................................................................................159

How It Works .......................................................................................................................................161

7-2. Designing Intelligent Constants ............................................................................ 162

Problem .............................................................................................................................................. 162

Solution...............................................................................................................................................162

How It Works .......................................................................................................................................165

7-3. Executing Code Based on a Speciﬁed Value ......................................................... 166

Problem .............................................................................................................................................. 166

Solution...............................................................................................................................................166

How It Works .......................................................................................................................................169

7-4. Working with Fix-Sized Arrays .............................................................................. 170

Problem .............................................................................................................................................. 170

Solution...............................................................................................................................................170

How It Works .......................................................................................................................................172

7-5. Safely Enabling Types or Methods to Operate on Objects of Various Types .......... 174

Problem .............................................................................................................................................. 174

Solution...............................................................................................................................................175

How It Works .......................................................................................................................................176

■ Contents

xix

7-6. Working with Dynamic Arrays ............................................................................... 180

Problem .............................................................................................................................................. 180

Solution...............................................................................................................................................180

How It Works .......................................................................................................................................182

7-7. Making Your Objects Iterable ................................................................................ 183

Problem .............................................................................................................................................. 183

Solution...............................................................................................................................................183

How It Works .......................................................................................................................................185

7-8. Iterating Over Collections ...................................................................................... 186

Problem .............................................................................................................................................. 186

Solution...............................................................................................................................................186

How It Works .......................................................................................................................................188

7-9. Iterating Over a Map ............................................................................................. 189

Problem .............................................................................................................................................. 189

Solution...............................................................................................................................................189

How It Works .......................................................................................................................................190

7-10. Executing Streams in Parallel ............................................................................. 192

Problem .............................................................................................................................................. 192

Solution...............................................................................................................................................192

How It Works .......................................................................................................................................193

Summary ...................................................................................................................... 193

■Chapter 8: Input and Output �� 195

8-1. Serializing Java Objects ........................................................................................ 196

Problem .............................................................................................................................................. 196

Solution...............................................................................................................................................196

How It Works .......................................................................................................................................197

8-2. Serializing Java Objects More Efﬁciently .............................................................. 199

Problem .............................................................................................................................................. 199

Solution...............................................................................................................................................199

How It Works .......................................................................................................................................199

■ Contents

8-3. Serializing Java Objects as XML ........................................................................... 200

Problem .............................................................................................................................................. 200

Solution...............................................................................................................................................200

How It Works .......................................................................................................................................201

8-4. Creating a Socket Connection and Sending Serializable Objects

Across the Wire ..................................................................................................... 202

Problem .............................................................................................................................................. 202

Solution...............................................................................................................................................202

How It Works .......................................................................................................................................204

8-5. Obtaining the Java Execution Path ....................................................................... 205

Problem .............................................................................................................................................. 205

Solution...............................................................................................................................................205

How It Works .......................................................................................................................................205

8-6. Copying a File ....................................................................................................... 205

Problem .............................................................................................................................................. 205

Solution...............................................................................................................................................206

How It Works .......................................................................................................................................206

8-7. Moving a File......................................................................................................... 206

Problem .............................................................................................................................................. 206

Solution...............................................................................................................................................206

How It Works .......................................................................................................................................207

8-8. Creating a Directory .............................................................................................. 207

Problem .............................................................................................................................................. 207

Solution 1............................................................................................................................................207

Solution 2............................................................................................................................................207

How It Works .......................................................................................................................................208

8-9. Iterating Over Files in a Directory ......................................................................... 208

Problem .............................................................................................................................................. 208

Solution...............................................................................................................................................208

How It Works .......................................................................................................................................209

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