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+# Thread
+## 参考
+[Thread源码分析 - 简书](https://www.jianshu.com/p/7a2c51635d4c)
+[从源码的角度再学「Thread」 - 简书](https://www.jianshu.com/p/5cf0a0899b6e)
+zybuluo.com/kiraSally/note/823674#111-线程组成
+[(四)Thread.join的作用和原理 - 简书](https://www.jianshu.com/p/fc51be7e5bc0)
+## 数据结构
+1. Thread 类的类结构?提供了哪些实例变量以供设置?
+![](Thread/5A6E17A6-73B1-41DA-B390-2A7A3D2F292F.png)
+
+
+## 创建/初始化/启动
+	1. Thread 类的构造函数的特点?通过 init()方法会初始化哪些信息(给哪些实例变量赋值)? init 方法的执行过程?
+![](Thread/18ABC9EA-0A31-4DEA-8CF3-70CF70AE58BA.png)
+
+
+2. 创建线程的两种方式?
+![](Thread/D623A1A0-3B0B-49FC-8304-BAD0E9B4D77D.png)
+
+3. 正常的启动线程都是调用Thread的start()方法,此时的执行过程是怎样的,start()与 run()方法的关系?
+![](Thread/D1B35CFF-0605-4C13-B25B-36DEDB17CA15.png)
+
+
+##  线程状态
+1. 线程可以处于哪几种状态,各个状态之间如何转换?注意阻塞状态分为哪三种阻塞?
+![](Thread/F044EC04-CA39-47E1-A0EC-0614506B5AD3.png)
+
+2. 通过suspend方法和resume方法暂停/恢复线程的过程?
+![](Thread/0B6D660C-0559-4AD9-8079-F0120D739ECF.png)
+
+3. 为什么不推荐/弃用通过suspend方法和resume方法暂停/恢复线程?存在什么问题?
+![](Thread/EE9E6DBC-0087-4B1D-ABB1-A59386C96638.png)
+
+4. Thread 类中 yield()方法的作用和特点?
+![](Thread/906E3430-7F13-401A-9A73-0B95F72DB738.png)
+
+5. Thread 类 sleep()方法的特点?和Object类 wait()方法的比较,相同点和不同点分别是?
+![](Thread/D1167701-B8E6-491B-AE29-3728F5E289E3.png)
+
+
+
+## 线程中断
+
+1. 为什么 Java 要提供中断机制?中断机制中程序要处理什么工作?
+![](Thread/EDD48E00-6B4D-4B60-8CF6-1F2722C47B58.png)
+
+2. Thread 类中提供了哪三个和中断操作相关的方法?
+
+![](Thread/21FAD189-5F1D-4BD5-B88C-69EA9B78B272.png)
+
+3. 中断线程分为哪三种情况?
+![](Thread/C026C47E-6E0A-4907-ADB6-5EB97A42B62A.png)
+
+4. 可以通过哪几种方式来处理中断?
+![](Thread/901C8902-2732-4EFA-B88D-169B70DD1D28.png)
+
+5. Thread 类禁用 stop 方法的原因?使用 stop()方法会导致什么问题?
+![](Thread/6226AA0E-8D4A-4AD0-8EEE-58FD71279010.png)
+
+## 线程优先级
+1. 如何设置线程的优先级?当前线程优先级可以设置的上限?
+![](Thread/CBD32551-BBA5-41B0-9160-30769E3E8F49.png)
+
+2. 线程的优先级对线程调度的影响?线程的优先级具有哪些特点(优先级规则)?
+![](Thread/8092BE05-9DB1-4D06-9DB3-B4432A8AFD21.png)
+
+## 守护线程
+1. 如何设置守护线程?
+
+![](Thread/F78CD643-5D55-42C2-AE96-2BDFEC90E0D7.png)
+2. 守护线程具有什么样的特点?使用注意?
+
+![](Thread/FD7D76E5-04C8-4B37-B0A2-A440C788BF71.png)
+
+## 线程间通信
+1. 如何通过 Thread 类的 Sleep 方法+While(true)来实现以轮询机制的方式的线程间通信?轮询这种方式的缺点?
+![](Thread/CA5E2810-1A24-41A3-97D4-FD793092914C.png)
+
+2. 通过 **等待/通知机制**的方式的线程间通信时,调用的**Object类的wait和notify方法**的特点?
+![](Thread/EF8C3EC6-91F3-4BDC-A255-4DECE14C9DC2.png)
+3. wait/notify机制运行的过程,具体说明?
+![](Thread/9196C7B7-EC5B-44D7-9A22-308F06655CD7.png)
+
+4. 通过 Thread 类 join 方法实现的线程间通信的作用和特点,使用场景?为什么 join 方法底层要用 wait()方法实现和不用 sleep()方法呢?
+![](Thread/3FFEA0E5-C0FC-48BA-AC92-287B8516336A.png)
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diff --git a/week_05/18/ThreadLocal.md b/week_05/18/ThreadLocal.md
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+# ThreadLocal
+## 参考
+[并发番@ThreadLocal一文通（1.7版） - 作业部落 Cmd Markdown 编辑阅读器](https://www.zybuluo.com/kiraSally/note/854555)
+[这才是 Thread Local 的正确原理与适用场景 根本没有内存泄漏 | 技术世界 | java,thread local,java 8,CAS,多线程,并发,技术世界,郭俊 Jason](http://www.jasongj.com/java/threadlocal/)
+[转-ThreadLocal源码解读（大牛之作） - 简书](https://www.jianshu.com/p/6e4233f96532)
+[(八)ThreadLocal的使用及原理分析 - 简书](https://www.jianshu.com/p/b2495b136fd7)
+[阿里架构师浅析ThreadLocal源码——黄金分割数的使用-爱码仕i的博客-51CTO博客](https://blog.51cto.com/14409778/2416835)
+[ThreadLocal面试攻略：吃透它的每一个细节和设计原理 - 每日头条](https://kknews.cc/code/pv33abp.html)
+[阿里架构师浅析ThreadLocal源码——黄金分割数的使用-爱码仕i的博客-51CTO博客](https://blog.51cto.com/14409778/2416835)
+[一篇文章，从源码深入详解ThreadLocal内存泄漏问题 - 简书](https://www.jianshu.com/p/86ecbab69432)
+## Why use
+	1. ThreadLocal解决了什么问题? ThreadLocal的使用场景?
+![](ThreadLocal/6BC04B2D-BD91-4BC9-8C20-829FE988D741.png)
+
+## 数据结构
+1. ThreadLocal 的类结构,内部结构?
+![](ThreadLocal/0E7F8CE3-F613-4F17-9B07-38D737B57B81.png)
+
+
+## ThreadLocalMap
+1. ThreadLocal中的静态内部类ThreadLocalMap是什么?
+![](ThreadLocal/30C8A3F3-04B6-4318-B8A6-34779D9A0688.png)
+
+
+2. ThreadLocal中的静态内部类ThreadLocalMap类的静态内部类Entry便是ThreadLocalMap里定义的节点，它继承了WeakReference类,为什么要定义成弱引用?定义成弱引用可以防止什么问题?
+
+![](ThreadLocal/35173306-755C-49E9-BB13-D2F81C568B98.png)
+
+3. ThreadLocalMap**是在哪里构造?** 构造的具体过程?
+![](ThreadLocal/F0149697-1C19-4A86-BFEE-B9E89C7DD9EC.png)
+
+4. 在构造ThreadLocalMap时，使用this作为key来存储，那么对于同一个ThreadLocal对象，如果同一个Thread中存储了多个值，是如何来区分存储的呢？
+![](ThreadLocal/52F0267C-C594-44F3-B700-5574BAB6F231.png)
+5. 为什么ThreadLocalMap 采用开放地址法来解决哈希冲突?这种方式解决哈希冲突的优缺点(尤其要理解缺点,因为针对这些缺点在实现的时候都需要在代码里一一处理)?
+![](ThreadLocal/FC78BFCA-C0FA-40D0-87E7-7599EC77216B.png)
+
+
+## Set
+	1. ThreadLocal中什么是StaleEntry(过期槽位),过期槽位的特点,调用 set 方法时针对过期槽位要如何处理?
+![](ThreadLocal/578D5098-CE48-4126-8925-DFCEAB515210.png)
+
+	3. ThreadLocal 中 set 方法调用的replaceStaleEntry方法来替换过期槽位的Entry的执行过程中,*遍历staleSlot之后的哈希槽，如果Key匹配*的情况,为什么要跟后面 key 匹配的槽位交换槽位,而不是直接在当前的过期槽位设置值?
+		- 插入 key= 5的情况
+![](ThreadLocal/3BB82EF6-4CA0-4449-B2F3-AC53F3783583.png)
+
+4. ThreadLocal 中 set 方法线性探索时,如果 key 为 null,则调用的replaceStaleEntry方法来替换过期槽位的Entry的执行过程中?
+![](ThreadLocal/319D31CF-E194-4EB3-89DC-5F9AD6D521C2.png)
+
+5. ThreadLocal 中 set 方法执行的整理流程?
+![](ThreadLocal/1A4DAF72-DFD5-49A3-96A5-AD7FBD9A2F25.png)
+6.  ThreadLocal 中 set 方法中调用cleanSomeSlots进行启发式搜素*寻找过期槽点*,然后调用expungeStaleEntry执行一次全量清理,其中cleanSomeSlots(int i,int n)的执行过程和原理是怎样的?其中参数 i,n 的意义?调用cleanSomeSlots的场景?为什么要用启发式搜索?
+![](ThreadLocal/FE4FDE97-E878-4B5B-96F8-49FA44087E45.png)
+
+7. ThreadLocal 中 set 方法中调用cleanSomeSlots进行启发式搜素*寻找过期槽点*,然后调用expungeStaleEntry执行一次全量清理的完整过程和特点?
+![](ThreadLocal/0906E50F-8AFD-45CF-BBCD-BE2150B7A9D3.png)
+
+8. ThreadLocal 中 set 方法中调用的执行一次全量清理的方法**expungeStaleEntry**的执行过程?为什么清理的时候如果key 存在需要重新计算key在Entry 数组中的下标索引?
+![](ThreadLocal/FEF53E85-2AFD-43B2-8769-DAD0B1CBA0FC.png)
+
+9. ThreadLocal 中 set 方法线性探索时,如果 key 为 null,则调用的replaceStaleEntry方法来替换过期槽位的Entry的执行过程的特点?会遇到哪四种情况?
+![](ThreadLocal/C7F5F317-D54B-4201-B224-B002015BD770.png)
+
+## 其它
+1. ThreadLocal 中get 方法执行的整理流程?
+![](ThreadLocal/60F2919F-F5A9-4D24-A504-2E5A31EC710D.png)
+
+
+2. ThreadLocal 中remove 方法执行的整理流程?
+
+![](ThreadLocal/375D888D-E0AB-4381-B900-4AD4D6CCE448.png)
+
+
+##  内存泄露
+	1. ThreadLocal 使用不当的时候为什么会导致内存泄露?哪些不当操作会导致内存泄露?如何验证?如何防止内存泄露?
+
+![](ThreadLocal/ADDC7ACF-3988-455A-B87D-3C7E6B7A9013.png)
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diff --git a/week_05/18/ThreadPoolExecutor.md b/week_05/18/ThreadPoolExecutor.md
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+++ b/week_05/18/ThreadPoolExecutor.md
@@ -0,0 +1,96 @@
+# ThreadPoolExecutor
+
+
+## 参考
+[并发番@ThreadPoolExecutor一文通(1.8版) - 作业部落 Cmd Markdown 编辑阅读器](https://www.zybuluo.com/kiraSally/note/990993)
+- - - -
+
+[ThreadPoolExecutor 源码剖析 - 开发者头条](https://toutiao.io/posts/xvdwgc/preview)
+[深度解读 java 线程池设计思想及源码实现_Javadoop](https://javadoop.com/post/java-thread-pool)
+https://blog.csdn.net/ShiXueTanLang/article/details/78888262
+
+## Why use
+
+1. 通过案例比较“单纯使用线程的方案”和“使用ThreadPoolExecutor线程池的方案”，在解决问题上有什么区别?
+
+![](ThreadPoolExecutor/D4F6F62E-A2D1-44EB-B16C-7653FFF8E0A4.png)
+
+2. 使用 Java 线程池带来的好处?
+
+![](ThreadPoolExecutor/0F76C1CC-10A8-4705-BBDF-388F32AD82F4.png)
+
+## 线程池状态
+1. ThreadPoolExecutor(线程池)的生命周期中有哪5种线程池状态?
+![](ThreadPoolExecutor/D9FD48F2-6C21-4415-95C0-6B6138A62A7D.png)
+
+2. ThreadPoolExecutor中如何记录线程池的状态的?
+![](ThreadPoolExecutor/6A266278-8957-420F-BCEB-A03E2FE1FAFC.png)
+3.  ThreadPoolExecutor中如何记录线程池的running状态的状态码是如何计算出来的?
+![](ThreadPoolExecutor/EF8EA029-E524-4178-8F7B-A1C0EE418D36.png)
+
+
+4. 在ThreadPoolExecutor线程池的设计中，把整个任务执行框架线程池划分为5个生命周期,这些不同的状态之间如何转换的?
+![](ThreadPoolExecutor/A6790B22-470C-4E1A-B046-6C521B5937C8.png)
+5.  ThreadPoolExecutor中如何获取线程池的运行状态runState和当前有效线程数目?
+![](ThreadPoolExecutor/9616F725-1BD4-43A8-B110-67B791BD67E4.png)
+
+
+## 数据结构
+1. 线程池ThreadPoolExecutor的类图关系?
+![](ThreadPoolExecutor/CEC2E0C6-6680-42E3-8908-F7781DFE731D.png)
+
+2. **Worker是线程池(ThreadPoolExecutor)的内部类**,它的数据结构是怎样的?为什么这么设计
+
+![](ThreadPoolExecutor/249FB89C-015F-467E-9D2E-967D031CE8B5.png)
+
+3. ThreadPoolExecutor中 Worker 内部类**如何控制中断？**
+![](ThreadPoolExecutor/9B2A64F8-8C0A-4CC7-A545-601319B4F8D8.png)
+
+4. ThreadPoolExecutor中 Worker 内部类**为什么Worker不被设计成可重入锁？**
+![](ThreadPoolExecutor/61B0D753-4DF1-42F8-9F49-CE9AF4469146.png)
+![](ThreadPoolExecutor/B41A176A-224C-4760-B8EA-13BCB41FFE3B.png)
+
+## 线程池
+1. 如何创建一个线程池?实例化一个线程池,实际上是对哪7个属性进行赋值?
+![](ThreadPoolExecutor/26C7F6F0-984C-4E43-8A1B-D390923C640D.png)
+
+2. ThreadPoolExecutor线程池中**keepAliveTime**属性的特点?
+![](ThreadPoolExecutor/F46D33A8-888A-491E-BCCF-743A1CC446E2.png)
+
+3. ThreadPoolExecutor线程池中**corePoolSize**属性的特点?
+![](ThreadPoolExecutor/DBB4E3AC-72F5-480B-A791-C84AB0AE24B9.png)
+
+4. ThreadPoolExecutor线程池中**workQueue**(任务队列)属性的特点?什么时候线程池选择增加线程来处理任务?什么时候线程池选择用任务队列来处理任务?
+![](ThreadPoolExecutor/D0C6231A-4DB8-47D7-AE89-E1536909E903.png)
+
+5. 线程池实现原理?为什么这么设计?
+![](ThreadPoolExecutor/7C75665F-54DC-430C-8AF2-F81C8742C0A7.png)
+
+
+## 任务提交与执行
+1. ThreadPoolExecutor线程池提交任务,调用 execute 方法时会遇到的三种情况?
+![](ThreadPoolExecutor/9B9507BD-1F5F-44DD-9973-DC8789525979.png)
+
+2. ThreadPoolExecutor线程池执行任务,调用 addWorker 方法*在线程池中创建一个新的线程并执行*的调用过程是怎样的?
+![](ThreadPoolExecutor/5A450721-73A7-4B26-B0B2-75E5B397B4DD.png)
+
+3. ThreadPoolExecutor线程池执行任务,调用 addWorker 方法*在线程池中创建一个新的线程并执行*,*哪两种情况是允许添加work进入works集合*?(何时新增Worker才是有意义的呢？传入一个空任务的目的是什么？)
+
+![](ThreadPoolExecutor/5D83C12A-423F-40BD-9E6A-9E53FF3AE05E.png)
+
+4. ThreadPoolExecutor线程池执行任务,最终调用的真正执行任务的方法runWorker的执行流程?**为什么新任务不直接放入任务队列而是被新线程执行呢？**
+![](ThreadPoolExecutor/07B64BC9-0644-40C2-8A48-86D49526045B.png)
+
+5. ThreadPoolExecutor线程池执行任务,最终调用的获取任务的方法getTask的执行流程?**
+![](ThreadPoolExecutor/DE507B17-6DE2-44AE-967C-6542DBF01EC5.png)
+
+## 关闭线程池
+1. ThreadPoolExecutor中shutdown方法有序的关闭线程池的过程?
+![](ThreadPoolExecutor/5A8FD7E5-D637-404C-B0D7-36C4241482F7.png)
+
+2. ThreadPoolExecutor中**shutdownNow**方法立即关闭线程池的过程?
+![](ThreadPoolExecutor/51CF28FB-D9A1-4BD8-96A9-5E04F427EB25.png)
+
+3. ThreadPoolExecutor中**当关闭线程池时，awaitTermination()会一直阻塞直到哪三种情况之一的出现**?
+![](ThreadPoolExecutor/22F62F9F-9EAA-4043-B19B-5AC2C3718489.png)
+
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