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<!DOCTYPE html><html data-theme="light"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5"><title>我的博客</title><meta name="description"><meta name="author" content="kim yhow"><meta name="copyright" content="kim yhow"><meta name="format-detection" content="telephone=no"><link rel="shortcut icon" href="/img/favicon.ico"><link rel="preconnect" href="//cdn.jsdelivr.net"><link rel="preconnect" href="https://fonts.googleapis.com" crossorigin><link rel="preconnect" href="//busuanzi.ibruce.info"><meta name="twitter:card" content="summary"><meta name="twitter:title" content="我的博客"><meta name="twitter:description"><meta name="twitter:image" content="http://yoursite.com/img/kimyhow.png"><meta property="og:type" content="website"><meta property="og:title" content="我的博客"><meta property="og:url" content="http://yoursite.com/"><meta property="og:site_name" content="我的博客"><meta property="og:description"><meta property="og:image" content="http://yoursite.com/img/kimyhow.png"><meta http-equiv="Cache-Control" content="no-transform"><meta http-equiv="Cache-Control" content="no-siteapp"><script src="https://cdn.jsdelivr.net/npm/js-cookie/dist/js.cookie.min.js"></script><script>const autoChangeMode = 'false'
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class="fa-fw fa fa-heart"></i><span> 关于</span></a></div><div class="menus_item"><a class="site-page"><i class="fa-fw fa fa-list" aria-hidden="true"></i><span> 娱乐</span><i class="fa fa-chevron-down menus-expand" aria-hidden="true"></i></a><ul class="menus_item_child"><li><a class="site-page" href="/music/"><i class="fa-fw fa fa-music"></i><span> Music</span></a></li><li><a class="site-page" href="/movies/"><i class="fa-fw fa fa-film"></i><span> Movie</span></a></li></ul></div></div></div></div><div id="body-wrap"><nav class="full_page" id="nav" style="background-image: url(/img/8.jpg)"><div id="site-info"><div id="site-title"><span class="blogtitle">我的博客</span></div><div id="site-sub-title"><span class="subtitle"></span></div><div id="site-social-icons"><a class="social-icon" href="https://github.com/kim-yhow" target="_blank"><i class="fa fa-github" aria-hidden="true"></i></a><a class="social-icon" href="mailto:[email protected]" target="_blank"><i class="fa fa-envelope" aria-hidden="true"></i></a><a class="social-icon" href="https://blog.csdn.net/qq_32846595" target="_blank"><i class="fa fa-key" aria-hidden="true"></i></a></div></div><div class="scroll-down"><i class="fa fa-angle-down scroll-down-effects"></i></div></nav><main id="content-outer"><div class="layout_page" id="content-inner"><div class="recent-posts" id="recent-posts"><div class="recent-post-item article-container"><div class="post_cover left_radius"><a href="/2020/08/19/Spring-注解开发/" title="No title"><img class="post_bg lazyload" data-src="/img/cover/15.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="No title"></a></div><div class="recent-post-info"> <a class="article-title" href="/2020/08/19/Spring-注解开发/" title="No title">No title</a><time class="post-meta__date"><i class="fa fa-calendar" aria-hidden="true"></i> 2020-08-19</time><span class="article-meta"><span class="article-meta__separator">|</span><i class="fa fa-inbox article-meta__icon" aria-hidden="true"></i><a class="article-meta__categories" href="/categories/java/">java</a></span><div class="content">1. Spring注解开发1.1 Spring原始注解
注解
说明
@Component
使用在类上用于实例化Bean
@Controller
使用在web层类上用于实例化Bean
@Service
使用在service层类上用于实例化Bean
@Repository
使用 ...</div></div></div><div class="recent-post-item article-container"><div class="post_cover right_radius"><a href="/2020/08/15/synchronized-volatile-全面理解/" title="synchronized & volatile 全面理解"><img class="post_bg lazyload" data-src="/img/cover/15.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="synchronized & volatile 全面理解"></a></div><div class="recent-post-info"> <a class="article-title" href="/2020/08/15/synchronized-volatile-全面理解/" title="synchronized & volatile 全面理解">synchronized & volatile 全面理解</a><time class="post-meta__date"><i class="fa fa-calendar" aria-hidden="true"></i> 2020-08-15</time><span class="article-meta"><span class="article-meta__separator">|</span><i class="fa fa-inbox article-meta__icon" aria-hidden="true"></i><a class="article-meta__categories" href="/categories/java/">java</a></span><div class="content">1. CAS
CAS也称为自旋锁
2.用户态和内核态用户态只能访问用户允许访问的内容
内核态可以访问所有内容
jdk早期，synchronized叫做重量级锁，因为申请锁资源必须通过kernel，系统调用。
3.锁升级自旋锁什么时候升级为重量级锁？
为什么有自旋锁还需要重量级锁？
自旋是消耗CPU ...</div></div></div><div class="recent-post-item article-container"><div class="post_cover left_radius"><a href="/2020/08/09/java-volatile/" title="java_volatile"><img class="post_bg lazyload" data-src="/img/cover/5.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="java_volatile"></a></div><div class="recent-post-info"> <a class="article-title" href="/2020/08/09/java-volatile/" title="java_volatile">java_volatile</a><time class="post-meta__date"><i class="fa fa-calendar" aria-hidden="true"></i> 2020-08-09</time><span class="article-meta"><span class="article-meta__separator">|</span><i class="fa fa-inbox article-meta__icon" aria-hidden="true"></i><a class="article-meta__categories" href="/categories/java/">java</a></span><div class="content">1.1多线程下变量的不可见性1.1.1 说明 多线程并发执行下，多个线程修改共享变量，会出现一个线程修改了共享变量的值后，另一个线程无法直接看到修改的新值。
1.2 变量不可见性的内存语义1.2.1 概述JMM（Java Memory Model）：java内存模型是java虚拟机规 ...</div></div></div><div class="recent-post-item article-container"><div class="post_cover right_radius"><a href="/2020/08/09/java-concurrent/" title="java_concurrent"><img class="post_bg lazyload" data-src="/img/cover/7.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="java_concurrent"></a></div><div class="recent-post-info"> <a class="article-title" href="/2020/08/09/java-concurrent/" title="java_concurrent">java_concurrent</a><time class="post-meta__date"><i class="fa fa-calendar" aria-hidden="true"></i> 2020-08-09</time><span class="article-meta"><span class="article-meta__separator">|</span><i class="fa fa-inbox article-meta__icon" aria-hidden="true"></i><a class="article-meta__categories" href="/categories/java/">java</a></span><div class="content">一些常用数据结构对应的线程安全类
Atomic原子类型线程池线程池维护若干个线程，处于等待状态
如果有新任务，就分配一个空闲线程执行
如果所有线程都处于忙碌状态，新任务放入队列等待
jdk提供了ExecutorService接口表示线程池：
总结JDK提供了ExecutorService实现了线程池 ...</div></div></div><div class="recent-post-item article-container"><div class="post_cover left_radius"><a href="/2020/08/09/java-ReentrantLock/" title="java_ReentrantLock"><img class="post_bg lazyload" data-src="/img/cover/15.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="java_ReentrantLock"></a></div><div class="recent-post-info"> <a class="article-title" href="/2020/08/09/java-ReentrantLock/" title="java_ReentrantLock">java_ReentrantLock</a><time class="post-meta__date"><i class="fa fa-calendar" aria-hidden="true"></i> 2020-08-09</time><span class="article-meta"><span class="article-meta__separator">|</span><i class="fa fa-inbox article-meta__icon" aria-hidden="true"></i><a class="article-meta__categories" href="/categories/java/">java</a></span><div class="content">ReentrantLock
ReentrantLock可以替代synchronized
ReentrantLock获取锁更安全
必须使用try…finally保证正确获取和释放锁
ReadWriteLock
ReadWriteLock只允许一个线程写入
ReadWriteLock允许多个线程同时读 ...</div></div></div><div class="recent-post-item article-container"><div class="post_cover right_radius"><a href="/2020/08/08/java——wait-和notify/" title="java——wait()和notify() "><img class="post_bg lazyload" data-src="/img/cover/5.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="java——wait()和notify() "></a></div><div class="recent-post-info"> <a class="article-title" href="/2020/08/08/java——wait-和notify/" title="java——wait()和notify() ">java——wait()和notify() </a><time class="post-meta__date"><i class="fa fa-calendar" aria-hidden="true"></i> 2020-08-08</time><span class="article-meta"><span class="article-meta__separator">|</span><i class="fa fa-inbox article-meta__icon" aria-hidden="true"></i><a class="article-meta__categories" href="/categories/java/">java</a></span><div class="content">synchronized 没有解决多线程协调的问题多线程协调运行：当条件不满足时，线程进入等待状态
wait()执行
只能在sychronized中调用wait，wait会释放锁。
总结
在synchronized内部可以调用wait（）使线程进入等待状态
必须在已获得的锁对象上调用wait（ ...</div></div></div><div class="recent-post-item article-container"><div class="post_cover left_radius"><a href="/2020/08/08/java死锁/" title="java死锁"><img class="post_bg lazyload" data-src="/img/cover/7.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="java死锁"></a></div><div class="recent-post-info"> <a class="article-title" href="/2020/08/08/java死锁/" title="java死锁">java死锁</a><time class="post-meta__date"><i class="fa fa-calendar" aria-hidden="true"></i> 2020-08-08</time><span class="article-meta"><span class="article-meta__separator">|</span><i class="fa fa-inbox article-meta__icon" aria-hidden="true"></i><a class="article-meta__categories" href="/categories/java/">java</a></span><div class="content">java的线程锁可以重入的锁，锁对象也可以不同java123456public void add(int m) {synchronized (1ock) { this.value += m; synchronized (lock) { this.another ...</div></div></div><div class="recent-post-item article-container"><div class="post_cover right_radius"><a href="/2020/08/08/java线程同步/" title="java线程同步"><img class="post_bg lazyload" data-src="/img/cover/14.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="java线程同步"></a></div><div class="recent-post-info"> <a class="article-title" href="/2020/08/08/java线程同步/" title="java线程同步">java线程同步</a><time class="post-meta__date"><i class="fa fa-calendar" aria-hidden="true"></i> 2020-08-08</time><span class="article-meta"><span class="article-meta__separator">|</span><i class="fa fa-inbox article-meta__icon" aria-hidden="true"></i><a class="article-meta__categories" href="/categories/java/">java</a></span><div class="content">1.多线程的问题当多个线程同时运行时，线程的调度由操作系统决定，程序本身无法决定。因此，任何一个线程都有可能在任何指令处被操作系统暂停，然后在某个时间段后继续执行。
这个时候，有个单线程模型下不存在的问题就来了：如果多个线程同时读写共享变量，会出现数据不一致的问题。
2.注意
当对共享变量进行写入时 ...</div></div></div><div class="recent-post-item article-container"><div class="post_cover left_radius"><a href="/2020/08/07/java线程的状态/" title="java线程的状态"><img class="post_bg lazyload" data-src="/img/cover/7.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="java线程的状态"></a></div><div class="recent-post-info"> <a class="article-title" href="/2020/08/07/java线程的状态/" title="java线程的状态">java线程的状态</a><time class="post-meta__date"><i class="fa fa-calendar" aria-hidden="true"></i> 2020-08-07</time><span class="article-meta"><span class="article-meta__separator">|</span><i class="fa fa-inbox article-meta__icon" aria-hidden="true"></i><a class="article-meta__categories" href="/categories/java/">java</a></span><div class="content">线程状态
New 新创建
Runnable运行中
Blocked被阻塞
Waiting等待
Timed Waiting计时等待
Terminated已终止
Thread.join可以等待当前线程结束后，再运行主线程
中断线程
如果线程需要执行一个长时间任务，就可能终端线程
中断线程就是其他线程个该 ...</div></div></div><div class="recent-post-item article-container"><div class="post_cover right_radius"><a href="/2020/08/07/java多线程创建/" title="java多线程创建"><img class="post_bg lazyload" data-src="/img/cover/15.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="java多线程创建"></a></div><div class="recent-post-info"> <a class="article-title" href="/2020/08/07/java多线程创建/" title="java多线程创建">java多线程创建</a><time class="post-meta__date"><i class="fa fa-calendar" aria-hidden="true"></i> 2020-08-07</time><span class="article-meta"><span class="article-meta__separator">|</span><i class="fa fa-inbox article-meta__icon" aria-hidden="true"></i><a class="article-meta__categories" href="/categories/java/">java</a></span><div class="content">1.java多线程的创建创建MyThread类：
1） 从Thread 派生
2）覆盖run()方法
3）创建MyThread实例
4）调用start()启动
继承Runnable：
1）实现Runnable接口
2）覆写run（）方法
3）在main()创建Runnable方法
4）创建T ...</div></div></div><nav id="pagination"><div class="pagination"><span class="page-number current">1</span><a class="page-number" href="/page/2/">2</a><span class="space">…</span><a class="page-number" href="/page/10/">10</a><a class="extend next" rel="next" href="/page/2/"><i class="fa fa-fw fa-chevron-right" aria-hidden="true"></i></a></div></nav></div><div class="aside_content" id="aside_content"><div class="card-widget card-info"><div class="card-content"><div class="card-info-avatar is-center"><img class="avatar-img" src="/img/kimyhow.png" onerror="this.onerror=null;this.src='/img/friend_404.gif'" alt="avatar"><div class="author-info__name">kim yhow</div><div class="author-info__description"></div></div><div class="card-info-data"><div class="card-info-data-item is-center"><a href="/archives/"><div class="headline">Articles</div><div class="length_num">94</div></a></div><div class="card-info-data-item is-center"> <a href="/tags/"><div class="headline">Tags</div><div 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