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‎README.md‎

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2020
| 课时数 | 课时标题 | 在线播放 | 源码位置 |
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|:-----:|:--------|:-------|:-------|
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|第 1 课 | [课程介绍](https://github.com/biezhi/learn-java8) | [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_1.html#page=1) ¦ [Youtube](https://youtu.be/A733pQxiEDk) | 无 |
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|第 2 课 | [Java 8 的发展](https://github.com/biezhi/learn-java8/blob/master/java8-growing/README.md) | [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_2.html#page=2) ¦ [Youtube](https://youtu.be/fHhgm1AZzhs) | [java8-growing](https://github.com/biezhi/learn-java8/tree/master/java8-growing/src/main/java/io/github/biezhi/java8/growing) |
24-
|第 3 课 | [理解 lambda](https://github.com/biezhi/learn-java8/blob/master/java8-lambda/README.md) | [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_3.html#page=3) ¦ [Youtube](https://youtu.be/VkdMeFEGDH8) | [lambda1](https://github.com/biezhi/learn-java8/tree/master/java8-lambda/src/main/java/io/github/biezhi/java8/lambda/lesson1) |
25-
|第 4 课 | [初尝 lambda](https://github.com/biezhi/learn-java8/blob/master/java8-lambda/README.md) | [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_4.html#page=4) ¦ [Youtube](https://youtu.be/X7Zv5vygjTc) | [lambda2](https://github.com/biezhi/learn-java8/tree/master/java8-lambda/src/main/java/io/github/biezhi/java8/lambda/lesson2) |
26-
|第 5 课 | [lambda 进阶](https://github.com/biezhi/learn-java8/blob/master/java8-lambda/README.md) | [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_5.html#page=5) ¦ [Youtube](https://youtu.be/3G83it4IASc) | [lambda3](https://github.com/biezhi/learn-java8/tree/master/java8-lambda/src/main/java/io/github/biezhi/java8/lambda/lesson3) |
27-
|第 6 课 | [默认方法的妙用](https://github.com/biezhi/learn-java8/blob/master/java8-default-methods/README.md) | [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_6.html#page=6) ¦ [Youtube](https://youtu.be/sAuEnkWezDM) | [default-method](https://github.com/biezhi/learn-java8/tree/master/java8-default-methods/src/main/java/io/github/biezhi/java8/defaultmethods) |
28-
|第 7 课 | [干掉空指针之 Optional](https://github.com/biezhi/learn-java8/blob/master/java8-optional/README.md) | [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_7.html#page=7) ¦ [Youtube](https://youtu.be/br4kqCXPB9A) | [optional](https://github.com/biezhi/learn-java8/tree/master/java8-default-methods/src/main/java/io/github/biezhi/java8/optional) |
29-
|第 8 课 | 理解 Stream | 哔哩哔哩 ¦ Youtube | |
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|第 9 课 | Stream API（上）| 哔哩哔哩 ¦ Youtube | |
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|第 10 课 | Stream API（下）| 哔哩哔哩 ¦ Youtube | |
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|第 11 课 | 新的日期时间 API | 哔哩哔哩 ¦ Youtube | |
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|第 12 课 | 并发增强 | 哔哩哔哩 ¦ Youtube | |
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|第 13 课 | CompletableFuture | 哔哩哔哩 ¦ Youtube | |
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|第 14 课 | Nashorn 引擎 | 哔哩哔哩 ¦ Youtube | |
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|第 15 课| Java 8 最佳实践 | 哔哩哔哩 ¦ Youtube | |
37-
|第 16 课| 函数式编程的正确姿势 | 哔哩哔哩 ¦ Youtube | |
22+
|第 1 课 | [课程介绍](https://github.com/biezhi/learn-java8) | [网易云课堂](http://study.163.com/course/courseLearn.htm?courseId=1005047049&utm_campaign=commission&utm_source=cp-400000000397038&utm_medium=share#/learn/video?lessonId=1051513399&courseId=1005047049) ¦ [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_1.html#page=1) ¦ [Youtube](https://youtu.be/A733pQxiEDk) | 无 |
23+
|第 2 课 | [Java 8 的发展](https://github.com/biezhi/learn-java8/blob/master/java8-growing/README.md) | [网易云课堂](http://study.163.com/course/courseLearn.htm?courseId=1005047049&utm_campaign=commission&utm_source=cp-400000000397038&utm_medium=share#/learn/video?lessonId=1051508577&courseId=1005047049) ¦ [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_2.html#page=2) ¦ [Youtube](https://youtu.be/fHhgm1AZzhs) | [java8-growing](https://github.com/biezhi/learn-java8/tree/master/java8-growing/src/main/java/io/github/biezhi/java8/growing) |
24+
|第 3 课 | [理解 lambda](https://github.com/biezhi/learn-java8/blob/master/java8-lambda/README.md) | [网易云课堂](http://study.163.com/course/courseLearn.htm?courseId=1005047049&utm_campaign=commission&utm_source=cp-400000000397038&utm_medium=share#/learn/video?lessonId=1051516241&courseId=1005047049) ¦ [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_3.html#page=3) ¦ [Youtube](https://youtu.be/VkdMeFEGDH8) | [lambda1](https://github.com/biezhi/learn-java8/tree/master/java8-lambda/src/main/java/io/github/biezhi/java8/lambda/lesson1) |
25+
|第 4 课 | [初尝 lambda](https://github.com/biezhi/learn-java8/blob/master/java8-lambda/README.md) | [网易云课堂](http://study.163.com/course/courseLearn.htm?courseId=1005047049&utm_campaign=commission&utm_source=cp-400000000397038&utm_medium=share#/learn/video?lessonId=1051511463&courseId=1005047049) ¦ [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_4.html#page=4) ¦ [Youtube](https://youtu.be/X7Zv5vygjTc) | [lambda2](https://github.com/biezhi/learn-java8/tree/master/java8-lambda/src/main/java/io/github/biezhi/java8/lambda/lesson2) |
26+
|第 5 课 | [lambda 进阶](https://github.com/biezhi/learn-java8/blob/master/java8-lambda/README.md) | [网易云课堂](http://study.163.com/course/courseLearn.htm?courseId=1005047049&utm_campaign=commission&utm_source=cp-400000000397038&utm_medium=share#/learn/video?lessonId=1051518174&courseId=1005047049) ¦ [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_5.html#page=5) ¦ [Youtube](https://youtu.be/3G83it4IASc) | [lambda3](https://github.com/biezhi/learn-java8/tree/master/java8-lambda/src/main/java/io/github/biezhi/java8/lambda/lesson3) |
27+
|第 6 课 | [默认方法的妙用](https://github.com/biezhi/learn-java8/blob/master/java8-default-methods/README.md) | [网易云课堂](http://study.163.com/course/courseLearn.htm?courseId=1005047049&utm_campaign=commission&utm_source=cp-400000000397038&utm_medium=share#/learn/video?lessonId=1051518175&courseId=1005047049) ¦ [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_6.html#page=6) ¦ [Youtube](https://youtu.be/sAuEnkWezDM) | [default-method](https://github.com/biezhi/learn-java8/tree/master/java8-default-methods/src/main/java/io/github/biezhi/java8/defaultmethods) |
28+
|第 7 课 | [干掉空指针之 Optional](https://github.com/biezhi/learn-java8/blob/master/java8-optional/README.md) | [网易云课堂](http://study.163.com/course/courseLearn.htm?courseId=1005047049&utm_campaign=commission&utm_source=cp-400000000397038&utm_medium=share#/learn/video?lessonId=1051511464&courseId=1005047049) ¦ [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_7.html#page=7) ¦ [Youtube](https://youtu.be/br4kqCXPB9A) | [optional](https://github.com/biezhi/learn-java8/tree/master/java8-default-methods/src/main/java/io/github/biezhi/java8/optional) |
29+
|第 8 课 | 理解 Stream | 网易云课堂 ¦ 哔哩哔哩 ¦ Youtube | |
30+
|第 9 课 | Stream API（上）| 网易云课堂 ¦ 哔哩哔哩 ¦ Youtube | |
31+
|第 10 课 | Stream API（下）| 网易云课堂 ¦ 哔哩哔哩 ¦ Youtube | |
32+
|第 11 课 | 新的日期时间 API | 网易云课堂 ¦ 哔哩哔哩 ¦ Youtube | |
33+
|第 12 课 | 并发增强 | 网易云课堂 ¦ 哔哩哔哩 ¦ Youtube | |
34+
|第 13 课 | CompletableFuture | 网易云课堂 ¦ 哔哩哔哩 ¦ Youtube | |
35+
|第 14 课 | Nashorn 引擎 | 网易云课堂 ¦ 哔哩哔哩 ¦ Youtube | |
36+
|第 15 课| Java 8 最佳实践 | 网易云课堂 ¦ 哔哩哔哩 ¦ Youtube | |
37+
|第 16 课| 函数式编程的正确姿势 | 网易云课堂 ¦ 哔哩哔哩 ¦ Youtube | |
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> 💡 点击课时标题即可查看课程大纲
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>

‎java8-stream/src/main/java/io/github/biezhi/java8/stream/lesson2/Example3.java‎

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/**
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* 映射
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*
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* <p>
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* map 使用
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* flatMap 使用
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*
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* @author biezhi
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* @date 2018/2/12
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*/
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public class Example3 {
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public static void main(String[] args) {
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List<Integer> numbers = Arrays.asList(1, 2, 1, 3, 3, 2, 4);
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List<String> words = Arrays.asList("Java 8", "Lambdas", "In", "Action");
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}
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}

‎java8-stream/src/main/java/io/github/biezhi/java8/stream/lesson2/Example4.java‎

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import java.util.List;
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/**
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* 合并流
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* 扁平流 flatMap
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* <p>
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* 列出List中各不相同的单词
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* <p>
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*/
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public class Example4 {
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public static void main(String[] args) {
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List<Integer> numbers = Arrays.asList(1, 2, 1, 3, 3, 2, 4);
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List<String> list = Arrays.asList("I am a boy", "I love the girl", "But the girl loves another girl");
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}
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}

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