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📝 update concurrent video url
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‎README.md‎

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|第 9 课 | [Stream API（上）](https://github.com/biezhi/learn-java8/blob/master/java8-stream/README.md#%E4%BD%BF%E7%94%A8%E6%B5%81) | [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=1051566020&courseId=1005047049) ¦ [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_9.html#page=9) ¦ [Youtube](https://youtu.be/mGwFJERNzmY) | [stream](https://github.com/biezhi/learn-java8/blob/master/java8-stream/src/main/java/io/github/biezhi/java8/stream/lesson2) |
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|第 10 课 | [Stream API（下）](https://github.com/biezhi/learn-java8/blob/master/java8-stream/README.md#collector-%E6%94%B6%E9%9B%86) | [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=1051571684&courseId=1005047049) ¦ [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_10.html#page=10) ¦ [Youtube](https://youtu.be/iubE0ezu-xI) | [stream](https://github.com/biezhi/learn-java8/tree/master/java8-stream/src/main/java/io/github/biezhi/java8/stream/lesson3) |
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|第 11 课 | [新的日期时间 API](https://github.com/biezhi/learn-java8/blob/master/java8-datetime-api/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=1051571688&courseId=1005047049) ¦ [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_11.html#page=11) ¦ [Youtube](https://youtu.be/hKXJvh-id1E) | [datetime](https://github.com/biezhi/learn-java8/tree/master/java8-datetime-api/src/main/java/io/github/biezhi/datetime) |
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|第 12 课 | 并发增强 | 网易云课堂 ¦ 哔哩哔哩 ¦ Youtube | |
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|第 12 课 | [并发增强](https://github.com/biezhi/learn-java8/blob/master/java8-concurrent/README.md) | 网易云课堂 ¦ [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_12.html#page=12) ¦ [Youtube](https://youtu.be/OYkToWIDEEI) | [concurrent](https://github.com/biezhi/learn-java8/tree/master/java8-concurrent/src/main/java/io/github/biezhi/java8/concurrent) |
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|第 13 课 | CompletableFuture | 网易云课堂 ¦ 哔哩哔哩 ¦ Youtube | |
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|第 14 课 | Nashorn 引擎 | 网易云课堂 ¦ 哔哩哔哩 ¦ Youtube | |
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|第 15 课| Java 8 最佳实践 | 网易云课堂 ¦ 哔哩哔哩 ¦ Youtube | |

‎java8-concurrent/README.md‎

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# java8 concurrent
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1. [知乎专栏 - Threads和Executors](https://zhuanlan.zhihu.com/p/33266682)
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2. [知乎专栏 - 同步和锁](http://zhuanlan.zhihu.com/p/33267015)
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3. [知乎专栏 - 原子变量和 ConcurrentMap](https://zhuanlan.zhihu.com/p/33267165)
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## Thread 和 Runnable
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所有的现代操作系统都通过进程和线程来支持并发。进程是通常彼此独立运行的程序的实例，比如，如果你启动了一个Java程序，操作系统产生一个新的进程，与其他程序一起并行执行。
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在这些进程的内部，我们使用线程并发执行代码，因此，我们可以最大限度的利用CPU可用的核心（core）。
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Java从JDK1.0开始执行线程。在开始一个新的线程之前，你必须指定由这个线程执行的代码，通常称为task。这可以通过实现Runnable——一个定义了一个无返回值无参数的 `run()` 方法的函数接口。
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## 线程池
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在执行一个异步任务或并发任务时，往往是通过直接 `new Thread()` 方法来创建新的线程，这样做弊端较多，更好的解决方案是合理地利用线程池，线程池的优势很明显，如下：

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