Java 8函数式编程(.pdf)

搬运工

前言.........................................................................................................................................................
IX
第 1 章 简介.........................................................................................................................................1
1.1 为什么需要再次修改 Java.........................................................................................................1
1.2 什么是函数式编程.....................................................................................................................2
1.3 示例.............................................................................................................................................2
第 2 章 Lambda 表达式...................................................................................................................5
2.1 第一个 Lambda 表达式..............................................................................................................5
2.2 如何辨别 Lambda 表达式..........................................................................................................6
2.3 引用值，而不是变量.................................................................................................................8
2.4 函数接口.....................................................................................................................................9
2.5 类型推断...................................................................................................................................10
2.6 要点回顾...................................................................................................................................12
2.7 练习...........................................................................................................................................12
第 3 章 流...........................................................................................................................................15
3.1 从外部迭代到内部迭代...........................................................................................................15
3.2 实现机制...................................................................................................................................17
3.3 常用的流操作...........................................................................................................................19
3.3.1 collect(toList()) ..................................................................................................
19
3.3.2 map............................................................................................................................
19
3.3.3 filter ......................................................................................................................
21
3.3.4 flatMap ....................................................................................................................
22
VI ｜ 目录
3.3.5 max 和 min.................................................................................................................
23
3.3.6 通用模式 ......................................................................................................................24
3.3.7 reduce ......................................................................................................................
24
3.3.8 整合操作 ......................................................................................................................26
3.4 重构遗留代码...........................................................................................................................27
3.5 多次调用流操作.......................................................................................................................30
3.6 高阶函数...................................................................................................................................31
3.7 正确使用 Lambda 表达式........................................................................................................31
3.8 要点回顾...................................................................................................................................32
3.9 练习...........................................................................................................................................32
3.10 进阶练习.................................................................................................................................33
第 4 章 类库.......................................................................................................................................35
4.1 在代码中使用 Lambda 表达式................................................................................................35
4.2 基本类型...................................................................................................................................36
4.3 重载解析...................................................................................................................................38
4.4 @FunctionalInterface ........................................................................................................
40
4.5 二进制接口的兼容性...............................................................................................................40
4.6 默认方法...................................................................................................................................41
4.7 多重继承...................................................................................................................................45
4.8 权衡...........................................................................................................................................46
4.9 接口的静态方法.......................................................................................................................46
4.10 Optional.............................................................................................................................47
4.11 要点回顾.................................................................................................................................48
4.12 练习.........................................................................................................................................48
4.13 开放练习.................................................................................................................................49
第 5 章 高级集合类和收集器........................................................................................................51
5.1 方法引用...................................................................................................................................51
5.2 元素顺序...................................................................................................................................52
5.3 使用收集器...............................................................................................................................54
5.3.1 转换成其他集合 ..........................................................................................................54
5.3.2 转换成值 ......................................................................................................................55
5.3.3 数据分块 ......................................................................................................................55
5.3.4 数据分组 ......................................................................................................................56
5.3.5 字符串 ..........................................................................................................................57
5.3.6 组合收集器 ..................................................................................................................58
5.3.7 重构和定制收集器 ......................................................................................................60
目录 ｜ VII
5.3.8 对收集器的归一化处理 ..............................................................................................65
5.4 一些细节...................................................................................................................................66
5.5 要点回顾...................................................................................................................................67
5.6 练习...........................................................................................................................................67
第 6 章 数据并行化 .........................................................................................................................69
6.1 并行和并发...............................................................................................................................69
6.2 为什么并行化如此重要...........................................................................................................70
6.3 并行化流操作...........................................................................................................................71
6.4 模拟系统...................................................................................................................................72
6.5 限制...........................................................................................................................................75
6.6 性能...........................................................................................................................................75
6.7 并行化数组操作.......................................................................................................................78
6.8 要点回顾...................................................................................................................................80
6.9 练习...........................................................................................................................................80
第 7 章 测试、调试和重构............................................................................................................81
7.1 重构候选项...............................................................................................................................81
7.1.1 进进出出、摇摇晃晃 ..................................................................................................82
7.1.2 孤独的覆盖 ..................................................................................................................82
7.1.3 同样的东西写两遍 ......................................................................................................83
7.2 Lambda 表达式的单元测试.....................................................................................................85
7.3 在测试替身时使用 Lambda 表达式........................................................................................87
7.4 惰性求值和调试.......................................................................................................................89
7.5 日志和打印消息.......................................................................................................................89
7.6 解决方案：peak...................................................................................................................
90
7.7 在流中间设置断点...................................................................................................................90
7.8 要点回顾...................................................................................................................................90
第 8 章 设计和架构的原则............................................................................................................91
8.1 Lambda 表达式改变了设计模式.............................................................................................92
8.1.1 命令者模式 ..................................................................................................................92
8.1.2 策略模式 ......................................................................................................................95
8.1.3 观察者模式 ..................................................................................................................97
8.1.4 模板方法模式 ............................................................................................................100
8.2 使用 Lambda 表达式的领域专用语言..................................................................................102
8.2.1 使用 Java 编写 DSL...................................................................................................103
8.2.2 实现 ............................................................................................................................104
VIII ｜ 目录
8.2.3 评估 ............................................................................................................................106
8.3 使用 Lambda 表达式的 SOLID 原则....................................................................................106
8.3.1 单一功能原则 ............................................................................................................107
8.3.2 开闭原则 ....................................................................................................................109
8.3.3 依赖反转原则 ............................................................................................................ 111
8.4 进阶阅读.................................................................................................................................114
8.5 要点回顾.................................................................................................................................114
第 9 章 使用 Lambda 表达式编写并发程序 ..........................................................................115
9.1 为什么要使用非阻塞式 I/O...................................................................................................115
9.2 回调.........................................................................................................................................116
9.3 消息传递架构.........................................................................................................................119
9.4 末日金字塔.............................................................................................................................120
9.5 Future ......................................................................................................................................122
9.6 CompletableFuture............................................................................................................123
9.7 响应式编程.............................................................................................................................126
9.8 何时何地使用新技术.............................................................................................................128
9.9 要点回顾.................................................................................................................................129
9.10 练习.......................................................................................................................................129
第 10 章 下一步该怎么办............................................................................................................131
封面介绍..............................................................................................................................................133

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