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343 lines
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343 lines
151 KiB
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rel="tag">is null</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/j-u-c/" rel="tag">j.u.c</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/java/" rel="tag">java</a><span class="tag-list-count">19</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/jvm/" rel="tag">jvm</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/leetcode/" rel="tag">leetcode</a><span class="tag-list-count">28</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/leetcode-155/" rel="tag">leetcode 155</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/linked-list/" rel="tag">linked list</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/linux/" rel="tag">linux</a><span 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href="/tags/read-view/" rel="tag">read view</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/redis/" rel="tag">redis</a><span class="tag-list-count">11</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/signal/" rel="tag">signal</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/sort/" rel="tag">sort</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/spark/" rel="tag">spark</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/ssh/" rel="tag">ssh</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/stack/" rel="tag">stack</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/string/" rel="tag">string</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/swoole/" rel="tag">swoole</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/top/" rel="tag">top</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/uname/" rel="tag">uname</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/unlock/" rel="tag">unlock</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/value/" rel="tag">value</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/websocket/" rel="tag">websocket</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/zsh/" rel="tag">zsh</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%89%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/" rel="tag">三阶段提交</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%8D%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/" rel="tag">不可变引用</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%9C%E4%BA%AC%E5%A5%A5%E8%BF%90%E4%BC%9A/" rel="tag">东京奥运会</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%A4%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/" rel="tag">两阶段提交</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E5%B1%B1%E8%B7%AF/" rel="tag">中山路</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E5%BA%8F/" rel="tag">中序</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E9%97%B4%E4%BB%B6/" rel="tag">中间件</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%BE%E9%87%8D/" rel="tag">举重</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B9%92%E4%B9%93%E7%90%83/" rel="tag">乒乓球</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%8B%E5%8A%A1/" rel="tag">事务</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%8C%E5%8F%89%E6%A0%91/" rel="tag">二叉树</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%92%E6%96%A5%E9%94%81/" rel="tag">互斥锁</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BB%A3%E7%A0%81%E9%A2%98%E8%A7%A3/" rel="tag">代码题解</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BF%AE%E7%94%B5%E8%84%91%E7%9A%84/" rel="tag">修电脑的</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%81%8F%E5%90%91%E9%94%81/" rel="tag">偏向锁</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%81%A5%E5%BA%B7%E7%A0%81/" rel="tag">健康码</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%85%AC%E4%BA%A4/" rel="tag">公交</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%85%AC%E4%BA%A4%E8%BD%A6/" rel="tag">公交车</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%86%85%E5%AD%98%E5%88%86%E5%B8%83/" rel="tag">内存分布</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/" rel="tag">内存泄漏</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%87%86%E5%A4%87/" rel="tag">准备</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%87%8F%E8%82%A5/" rel="tag">减肥</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E4%BA%8B%E5%8A%A1/" rel="tag">分布式事务</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E9%94%81/" rel="tag">分布式锁</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%87%E7%89%87/" rel="tag">切片</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%9D%E5%A7%8B%E5%8C%96/" rel="tag">初始化</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%89%8A%E5%B3%B0%E5%A1%AB%E8%B0%B7/" rel="tag">削峰填谷</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%89%8D%E5%BA%8F/" rel="tag">前序</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8A%A0%E5%A1%9E/" rel="tag">加塞</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8A%A0%E8%BD%BD/" rel="tag">加载</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8D%95%E4%BE%8B/" rel="tag">单例</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8D%9A%E5%AE%A2%EF%BC%8C%E6%96%87%E7%AB%A0/" rel="tag">博客，文章</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a 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class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%9F%BA%E7%A1%80%E8%AE%BE%E6%96%BD/" rel="tag">基础设施</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AE%89%E5%85%A8/" rel="tag">安全</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AE%B9%E9%94%99%E6%9C%BA%E5%88%B6/" rel="tag">容错机制</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AF%84%E7%94%9F%E8%99%AB/" rel="tag">寄生虫</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B0%84%E5%87%BB/" rel="tag">射击</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B0%8F%E6%8A%80%E5%B7%A7/" rel="tag">小技巧</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B1%80%E5%8F%A3%E8%A1%97/" rel="tag">局口街</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B8%83%E9%9A%86%E8%BF%87%E6%BB%A4%E5%99%A8/" rel="tag">布隆过滤器</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B2%E6%B4%BB/" rel="tag">干活</a><span class="tag-list-count">5</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/" rel="tag">年中总结</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/" rel="tag">年终总结</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B6%E5%8F%91/" rel="tag">并发</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B8%E7%A6%8F%E4%BA%86%E5%90%97/" rel="tag">幸福了吗</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%BB%E8%AF%BB/" rel="tag">幻读</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%BA%94%E7%94%A8/" rel="tag">应用</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%BC%80%E8%BD%A6/" rel="tag">开车</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%BC%B1%E5%BC%95%E7%94%A8/" rel="tag">弱引用</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%BD%B1%E8%AF%84/" rel="tag">影评</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%89%80%E6%9C%89%E6%9D%83/" rel="tag">所有权</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%89%93%E5%8D%A1/" rel="tag">打卡</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%89%B6%E6%A2%AF/" rel="tag">扶梯</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%8A%80%E6%9C%AF/" rel="tag">技术</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%8B%96%E6%9B%B4/" rel="tag">拖更</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%8E%92%E5%BA%8F/" rel="tag">排序</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%8E%A5%E9%9B%A8%E6%B0%B4/" rel="tag">接雨水</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%95%B0%E6%8D%AE%E6%BA%90%E5%8A%A8%E6%80%81%E5%88%87%E6%8D%A2/" rel="tag">数据源动态切换</a><span 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class="main-inner index posts-expand"><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2021/07/18/2021-%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2021/07/18/2021-%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/" class="post-title-link" itemprop="url">2021 年中总结</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2021-07-18 21:15:40" itemprop="dateCreated datePublished" datetime="2021-07-18T21:15:40+08:00">2021-07-18</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a> </span>， <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/%E7%94%9F%E6%B4%BB/%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/" itemprop="url" rel="index"><span itemprop="name">年中总结</span></a> </span>， <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/%E7%94%9F%E6%B4%BB/%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/2021/" itemprop="url" rel="index"><span itemprop="name">2021</span></a> </span></span><span id="/2021/07/18/2021-%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/" class="post-meta-item leancloud_visitors" data-flag-title="2021 年中总结" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2021/07/18/2021-%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2021/07/18/2021-年中总结/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><p>又到半年总结时，第一次写总结类型的文章感觉挺好写的，但是后面总觉得这过去的一段时间所做的事情，能力上的成长低于预期，但是是需要总结下，找找问题，顺便展望下未来。</p><p>这一年做的最让自己满意的应该就是看了一些书，由折腾群洋总发起的读书打卡活动，到目前为止已经读完了这几本书，《cUrl 必知必会》，《古董局中局 1》，《古董局中局 2》，《算法图解》，《每天 5 分钟玩转 Kubernetes》《幸福了吗？》《高可用可伸缩微服务架构：基于 Dubbo、Spring Cloud和 Service Mesh》《Rust 权威指南》后面可以写个专题说说看的这些书，虽然每天打卡如果时间安排不好，并且看的书像 rust 这样比较难的话还是会有点小焦虑，不过也是个调整过程，一方面可以在白天就抽空看一会，然后也不必要每次都看很大一章，注重吸收。</p><p>技术上的成长的话，有一些比较小的长进吧，对于一些之前忽视的 synchronized，ThreadLocal 和 AQS 等知识点做了下查漏补缺了，然后多了解了一些 Java 垃圾回收的内容，但是在实操上还是比较欠缺，成型的技术方案，架构上所谓的优化也比较少，一些想法也还有考虑不周全的地方，还需要多花时间和心思去学习加强，特别是在目前已经有的基础上如何做系统深层次的优化，既不要是鸡毛蒜皮的，也不能出现一些不可接受的问题和故障，这是个很重要的课题，需要好好学习，后面考虑定一些周期性目标，两个月左右能有一些成果和总结。</p><p>另外一部分是自己的服务，因为 ucloud 的机器太贵就没续费了，所以都迁移到腾讯云的小机器上了，顺便折腾了一点点 traefik，但是还很不熟练，不太习惯这一套，一方面是 docker 还不习惯，这也加重了对这套环境的不适应，还是习惯裸机部署，另一方面就是 k8s 了，家里的机器还没虚拟化，没有很好的条件可以做实验，这也是读书打卡的一个没做好的点，整体的学习效果受限于深度和实操，后面是看都是用 traefik，也找到了一篇文章可以 traefik 转发到裸机应用，因为主仓库用的是裸机的 gogs。</p><p>还有就是运动减肥上，唉，这又是很大的一个痛点，基本没效果，只是还算稳定，昨天看到一个视频说还需要力量训练来增肌，以此可以提升基础代谢，打算往这个方向尝试下，因为今天没有疫情限制了，在 6 月底完成了 200 公里的跑步小目标，只是有些膝盖跟大腿根外侧不适，抽空得去看下医生，后面打算每天也能做点卷腹跟俯卧撑。</p><p>下半年还希望能继续多看看书，比很多网上各种乱七八糟的文章会好很多，结合豆瓣评分，找一些评价高一些的文章，但也不是说分稍低点的就不行，有些也看人是不是适合，一般 6 分以上评价比较多的就可以试试。</p></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2021/07/11/%E8%81%8A%E8%81%8ASpringBoot-%E8%87%AA%E5%8A%A8%E8%A3%85%E9%85%8D/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2021/07/11/%E8%81%8A%E8%81%8ASpringBoot-%E8%87%AA%E5%8A%A8%E8%A3%85%E9%85%8D/" class="post-title-link" itemprop="url">聊聊 SpringBoot 自动装配</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2021-07-11 23:01:30" itemprop="dateCreated datePublished" datetime="2021-07-11T23:01:30+08:00">2021-07-11</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a> </span>， <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/SpringBoot/" itemprop="url" rel="index"><span itemprop="name">SpringBoot</span></a> </span></span><span id="/2021/07/11/%E8%81%8A%E8%81%8ASpringBoot-%E8%87%AA%E5%8A%A8%E8%A3%85%E9%85%8D/" class="post-meta-item leancloud_visitors" data-flag-title="聊聊 SpringBoot 自动装配" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2021/07/11/%E8%81%8A%E8%81%8ASpringBoot-%E8%87%AA%E5%8A%A8%E8%A3%85%E9%85%8D/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2021/07/11/聊聊SpringBoot-自动装配/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><p>springboot 自动装配调用链</p><p>springboot 相比 spring能更方便开发人员上手，比较重要的一点就是自动装配，大致来看下这个逻辑</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">SpringApplication</span><span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token class-name">SpbDemoApplication</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">,</span> args<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">/**
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* Static helper that can be used to run a {@link SpringApplication} from the
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* specified source using default settings.
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* @param primarySource the primary source to load
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* @param args the application arguments (usually passed from a Java main method)
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* @return the running {@link ApplicationContext}
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*/</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>然后就是上面调用的 run 方法</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token class-name">ConfigurableApplicationContext</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token operator">?</span><span class="token punctuation">></span></span> primarySource<span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token operator">?</span><span class="token punctuation">></span></span><span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token punctuation">{</span> primarySource <span class="token punctuation">}</span><span class="token punctuation">,</span> args<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">/**
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* Static helper that can be used to run a {@link SpringApplication} from the
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* specified sources using default settings and user supplied arguments.
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* @param primarySources the primary sources to load
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* @param args the application arguments (usually passed from a Java main method)
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* @return the running {@link ApplicationContext}
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*/</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>继续往下看</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token class-name">ConfigurableApplicationContext</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token operator">?</span><span class="token punctuation">></span></span><span class="token punctuation">[</span><span class="token punctuation">]</span> primarySources<span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">SpringApplication</span><span class="token punctuation">(</span>primarySources<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span>args<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre><div class="post-button"><a class="btn" href="/2021/07/11/%E8%81%8A%E8%81%8ASpringBoot-%E8%87%AA%E5%8A%A8%E8%A3%85%E9%85%8D/#more" rel="contents">阅读全文 »</a></div></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2021/07/04/Leetcode-42-%E6%8E%A5%E9%9B%A8%E6%B0%B4-Trapping-Rain-Water-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2021/07/04/Leetcode-42-%E6%8E%A5%E9%9B%A8%E6%B0%B4-Trapping-Rain-Water-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" class="post-title-link" itemprop="url">Leetcode 42 接雨水 (Trapping Rain Water) 题解分析</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2021-07-04 20:43:55" itemprop="dateCreated datePublished" datetime="2021-07-04T20:43:55+08:00">2021-07-04</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a> </span>， <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/leetcode/" itemprop="url" rel="index"><span itemprop="name">leetcode</span></a> </span></span><span id="/2021/07/04/Leetcode-42-%E6%8E%A5%E9%9B%A8%E6%B0%B4-Trapping-Rain-Water-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" class="post-meta-item leancloud_visitors" data-flag-title="Leetcode 42 接雨水 (Trapping Rain Water) 题解分析" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2021/07/04/Leetcode-42-%E6%8E%A5%E9%9B%A8%E6%B0%B4-Trapping-Rain-Water-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2021/07/04/Leetcode-42-接雨水-Trapping-Rain-Water-题解分析/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><h2 id="题目介绍"><a href="#题目介绍" class="headerlink" title="题目介绍"></a>题目介绍</h2><p>给定 n 个非负整数表示每个宽度为 1 的柱子的高度图，计算按此排列的柱子，下雨之后能接多少雨水。</p><h2 id="示例"><a href="#示例" class="headerlink" title="示例"></a>示例</h2><p><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/AggmPZ.jpg"><br><strong>输入</strong>：height = [0,1,0,2,1,0,1,3,2,1,2,1]<br><strong>输出</strong>：6<br><strong>解释</strong>：上面是由数组 [0,1,0,2,1,0,1,3,2,1,2,1] 表示的高度图，在这种情况下，可以接 6 个单位的雨水（蓝色部分表示雨水）。</p><h2 id="简单分析"><a href="#简单分析" class="headerlink" title="简单分析"></a>简单分析</h2><p>其实最开始的想法是从左到右扫区间，就是示例中的第一个水槽跟第二个水槽都可以用这个办法解决<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/zCLMbU.png"><br>前面这种是属于右侧比左侧高的情况，对于左侧高右侧低的就不行了，（写这篇的时候想起来可以再反着扫一遍可能可以）<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/tO4tWh.png"><br>所以这个方案不好，贴一下这个方案的代码</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">trap</span><span class="token punctuation">(</span><span class="token keyword">int</span><span class="token punctuation">[</span><span class="token punctuation">]</span> height<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">int</span> lastLeft <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>
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<span class="token keyword">int</span> sum <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
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<span class="token keyword">int</span> tempSum <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
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<span class="token keyword">boolean</span> startFlag <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> j <span class="token operator">:</span> height<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>startFlag <span class="token operator">&&</span> j <span class="token operator"><=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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startFlag <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
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<span class="token keyword">continue</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>j <span class="token operator">>=</span> lastLeft<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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sum <span class="token operator">+=</span> tempSum<span class="token punctuation">;</span>
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tempSum <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
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lastLeft <span class="token operator">=</span> j<span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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tempSum <span class="token operator">+=</span> lastLeft <span class="token operator">-</span> j<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">return</span> sum<span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>后面结合网上的解法，其实可以反过来，对于每个格子找左右侧的最大值，取小的那个和当前格子的差值就是这一个的储水量了<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/PXGiCa.png"><br>理解了这种想法，代码其实就不难了</p><h2 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h2><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">int</span> n <span class="token operator">=</span> height<span class="token punctuation">.</span>length<span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>n <span class="token operator"><=</span> <span class="token number">2</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// 思路转变下，其实可以对于每一格算储水量，算法就是找到这一格左边的最高点跟这一格右边的最高点，</span>
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<span class="token comment">// 比较两侧的最高点，取小的那个，然后再跟当前格子的高度对比，差值就是当前格的储水量</span>
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<span class="token keyword">int</span> maxL<span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">int</span><span class="token punctuation">[</span>n<span class="token punctuation">]</span><span class="token punctuation">;</span>
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<span class="token keyword">int</span> maxR<span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">int</span><span class="token punctuation">[</span>n<span class="token punctuation">]</span><span class="token punctuation">;</span>
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<span class="token keyword">int</span> max <span class="token operator">=</span> height<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
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maxL<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
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<span class="token comment">// 计算左侧的最高点</span>
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<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> i <span class="token operator"><</span> n <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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maxL<span class="token punctuation">[</span>i<span class="token punctuation">]</span> <span class="token operator">=</span> max<span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>max <span class="token operator"><</span> height<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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max <span class="token operator">=</span> height<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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max <span class="token operator">=</span> height<span class="token punctuation">[</span>n <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
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maxR<span class="token punctuation">[</span>n <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
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<span class="token keyword">int</span> tempSum<span class="token punctuation">,</span> sum <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
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<span class="token comment">// 计算右侧的最高点，并且同步算出来储水量，节省一个循环</span>
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<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> n <span class="token operator">-</span> <span class="token number">2</span><span class="token punctuation">;</span> i <span class="token operator">></span> <span class="token number">0</span><span class="token punctuation">;</span> i<span class="token operator">--</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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maxR<span class="token punctuation">[</span>i<span class="token punctuation">]</span> <span class="token operator">=</span> max<span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>height<span class="token punctuation">[</span>i<span class="token punctuation">]</span> <span class="token operator">></span> max<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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max <span class="token operator">=</span> height<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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tempSum <span class="token operator">=</span> <span class="token class-name">Math</span><span class="token punctuation">.</span><span class="token function">min</span><span class="token punctuation">(</span>maxL<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">,</span> maxR<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token operator">-</span> height<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>tempSum <span class="token operator">></span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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sum <span class="token operator">+=</span> tempSum<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">return</span> sum<span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2021/06/27/%E8%81%8A%E8%81%8A-Java-%E4%B8%AD%E7%BB%95%E4%B8%8D%E5%BC%80%E7%9A%84-Synchronized-%E5%85%B3%E9%94%AE%E5%AD%97-%E4%BA%8C/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2021/06/27/%E8%81%8A%E8%81%8A-Java-%E4%B8%AD%E7%BB%95%E4%B8%8D%E5%BC%80%E7%9A%84-Synchronized-%E5%85%B3%E9%94%AE%E5%AD%97-%E4%BA%8C/" class="post-title-link" itemprop="url">聊聊 Java 中绕不开的 Synchronized 关键字-二</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2021-06-27 16:03:48" itemprop="dateCreated datePublished" datetime="2021-06-27T16:03:48+08:00">2021-06-27</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a> </span></span><span id="/2021/06/27/%E8%81%8A%E8%81%8A-Java-%E4%B8%AD%E7%BB%95%E4%B8%8D%E5%BC%80%E7%9A%84-Synchronized-%E5%85%B3%E9%94%AE%E5%AD%97-%E4%BA%8C/" class="post-meta-item leancloud_visitors" data-flag-title="聊聊 Java 中绕不开的 Synchronized 关键字-二" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2021/06/27/%E8%81%8A%E8%81%8A-Java-%E4%B8%AD%E7%BB%95%E4%B8%8D%E5%BC%80%E7%9A%84-Synchronized-%E5%85%B3%E9%94%AE%E5%AD%97-%E4%BA%8C/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2021/06/27/聊聊-Java-中绕不开的-Synchronized-关键字-二/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><h1 id="Java并发"><a href="#Java并发" class="headerlink" title="Java并发"></a>Java并发</h1><p>synchronized 的一些学习记录</p><p>jdk1.6 以后对 synchronized 进行了一些优化，包括偏向锁，轻量级锁，重量级锁等</p><p>这些锁的加锁方式大多跟对象头有关，我们可以查看 jdk 代码</p><p>首先对象头的位置注释</p><pre class="line-numbers language-c" data-language="c"><code class="language-c"><span class="token comment">// Bit-format of an object header (most significant first, big endian layout below):</span>
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|
<span class="token comment">//</span>
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|
<span class="token comment">// 32 bits:</span>
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<span class="token comment">// --------</span>
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|
<span class="token comment">// hash:25 ------------>| age:4 biased_lock:1 lock:2 (normal object)</span>
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<span class="token comment">// JavaThread*:23 epoch:2 age:4 biased_lock:1 lock:2 (biased object)</span>
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<span class="token comment">// size:32 ------------------------------------------>| (CMS free block)</span>
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<span class="token comment">// PromotedObject*:29 ---------->| promo_bits:3 ----->| (CMS promoted object)</span>
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<span class="token comment">//</span>
|
|
<span class="token comment">// 64 bits:</span>
|
|
<span class="token comment">// --------</span>
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|
<span class="token comment">// unused:25 hash:31 -->| unused:1 age:4 biased_lock:1 lock:2 (normal object)</span>
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<span class="token comment">// JavaThread*:54 epoch:2 unused:1 age:4 biased_lock:1 lock:2 (biased object)</span>
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|
<span class="token comment">// PromotedObject*:61 --------------------->| promo_bits:3 ----->| (CMS promoted object)</span>
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<span class="token comment">// size:64 ----------------------------------------------------->| (CMS free block)</span>
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|
<span class="token comment">//</span>
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|
<span class="token comment">// unused:25 hash:31 -->| cms_free:1 age:4 biased_lock:1 lock:2 (COOPs && normal object)</span>
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<span class="token comment">// JavaThread*:54 epoch:2 cms_free:1 age:4 biased_lock:1 lock:2 (COOPs && biased object)</span>
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<span class="token comment">// narrowOop:32 unused:24 cms_free:1 unused:4 promo_bits:3 ----->| (COOPs && CMS promoted object)</span>
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<span class="token comment">// unused:21 size:35 -->| cms_free:1 unused:7 ------------------>| (COOPs && CMS free block)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><pre class="line-numbers language-c" data-language="c"><code class="language-c"><span class="token keyword">enum</span> <span class="token punctuation">{</span> locked_value <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span>
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unlocked_value <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">,</span>
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monitor_value <span class="token operator">=</span> <span class="token number">2</span><span class="token punctuation">,</span>
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marked_value <span class="token operator">=</span> <span class="token number">3</span><span class="token punctuation">,</span>
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biased_lock_pattern <span class="token operator">=</span> <span class="token number">5</span>
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<span class="token punctuation">}</span><span class="token punctuation">;</span>
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<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>我们可以用 java jol库来查看对象头，通过一段简单的代码来看下</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ObjectHeaderDemo</span> <span class="token punctuation">{</span>
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<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
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<span class="token class-name">L</span> l <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">L</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">ClassLayout</span><span class="token punctuation">.</span><span class="token function">parseInstance</span><span class="token punctuation">(</span>l<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toPrintable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/Untitled.png" alt="Untitled"></p><p>然后可以看到打印输出，当然这里因为对齐方式，我们看到的其实顺序是反过来的，按最后三位去看，我们这是 001，好像偏向锁都没开，这里使用的是 jdk1.8，默认开始偏向锁的，其实这里有涉及到了一个配置，jdk1.8 中偏向锁会延迟 4 秒开启，可以通过添加启动参数 -XX:+PrintFlagsFinal，看到</p><p><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/%E5%81%8F%E5%90%91%E9%94%81%E5%BB%B6%E8%BF%9F.png" alt="偏向锁延迟"></p><p>因为在初始化的时候防止线程竞争有大量的偏向锁撤销升级，所以会延迟 4s 开启</p><p>我们再来延迟 5s 看看</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ObjectHeaderDemo</span> <span class="token punctuation">{</span>
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<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
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<span class="token class-name">TimeUnit</span><span class="token punctuation">.</span>SECONDS<span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">L</span> l <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">L</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">ClassLayout</span><span class="token punctuation">.</span><span class="token function">parseInstance</span><span class="token punctuation">(</span>l<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toPrintable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span> <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/2LBKpX.jpg" alt="https://gitee.com/nicksxs/images/raw/master/uPic/2LBKpX.jpg"></p><p>可以看到偏向锁设置已经开启了，我们来是一下加个偏向锁</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ObjectHeaderDemo</span> <span class="token punctuation">{</span>
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<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
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|
<span class="token class-name">TimeUnit</span><span class="token punctuation">.</span>SECONDS<span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token class-name">L</span> l <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">L</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">ClassLayout</span><span class="token punctuation">.</span><span class="token function">parseInstance</span><span class="token punctuation">(</span>l<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toPrintable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">synchronized</span> <span class="token punctuation">(</span>l<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"1\n"</span> <span class="token operator">+</span> <span class="token class-name">ClassLayout</span><span class="token punctuation">.</span><span class="token function">parseInstance</span><span class="token punctuation">(</span>l<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toPrintable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">synchronized</span> <span class="token punctuation">(</span>l<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"2\n"</span> <span class="token operator">+</span> <span class="token class-name">ClassLayout</span><span class="token punctuation">.</span><span class="token function">parseInstance</span><span class="token punctuation">(</span>l<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toPrintable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>看下运行结果</p><p><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/V2l78m.png" alt="https://gitee.com/nicksxs/images/raw/master/uPic/V2l78m.png"></p><p>可以看到是加上了 101 = 5 也就是偏向锁，后面是线程 id</p><p>当我再使用一个线程来竞争这个锁的时候</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ObjectHeaderDemo</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
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|
<span class="token class-name">TimeUnit</span><span class="token punctuation">.</span>SECONDS<span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">L</span> l <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">L</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">ClassLayout</span><span class="token punctuation">.</span><span class="token function">parseInstance</span><span class="token punctuation">(</span>l<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toPrintable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token keyword">synchronized</span> <span class="token punctuation">(</span>l<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"1\n"</span> <span class="token operator">+</span> <span class="token class-name">ClassLayout</span><span class="token punctuation">.</span><span class="token function">parseInstance</span><span class="token punctuation">(</span>l<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toPrintable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token punctuation">}</span>
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|
<span class="token class-name">Thread</span> thread1 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
<span class="token annotation punctuation">@Override</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token class-name">TimeUnit</span><span class="token punctuation">.</span>SECONDS<span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">5L</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">synchronized</span> <span class="token punctuation">(</span>l<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"thread1 获取锁成功"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">ClassLayout</span><span class="token punctuation">.</span><span class="token function">parseInstance</span><span class="token punctuation">(</span>l<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toPrintable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token class-name">TimeUnit</span><span class="token punctuation">.</span>SECONDS<span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">5L</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span class="token punctuation">;</span>
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thread1<span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/bRMvlR.png" alt="https://gitee.com/nicksxs/images/raw/master/uPic/bRMvlR.png"></p><p>可以看到变成了轻量级锁，在线程没有争抢，只是进行了切换，就会使用轻量级锁，当两个线程在竞争了，就又会升级成重量级锁</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ObjectHeaderDemo</span> <span class="token punctuation">{</span>
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<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
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<span class="token class-name">TimeUnit</span><span class="token punctuation">.</span>SECONDS<span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">L</span> l <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">L</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">ClassLayout</span><span class="token punctuation">.</span><span class="token function">parseInstance</span><span class="token punctuation">(</span>l<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toPrintable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">synchronized</span> <span class="token punctuation">(</span>l<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"1\n"</span> <span class="token operator">+</span> <span class="token class-name">ClassLayout</span><span class="token punctuation">.</span><span class="token function">parseInstance</span><span class="token punctuation">(</span>l<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toPrintable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token class-name">Thread</span> thread1 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token annotation punctuation">@Override</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token class-name">TimeUnit</span><span class="token punctuation">.</span>SECONDS<span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">5L</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">synchronized</span> <span class="token punctuation">(</span>l<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"thread1 获取锁成功"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">ClassLayout</span><span class="token punctuation">.</span><span class="token function">parseInstance</span><span class="token punctuation">(</span>l<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toPrintable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token class-name">TimeUnit</span><span class="token punctuation">.</span>SECONDS<span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">5L</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span class="token punctuation">;</span>
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<span class="token class-name">Thread</span> thread2 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token annotation punctuation">@Override</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token class-name">TimeUnit</span><span class="token punctuation">.</span>SECONDS<span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">5L</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">synchronized</span> <span class="token punctuation">(</span>l<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"thread2 获取锁成功"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">ClassLayout</span><span class="token punctuation">.</span><span class="token function">parseInstance</span><span class="token punctuation">(</span>l<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toPrintable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span class="token punctuation">;</span>
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thread1<span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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thread2<span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">class</span> <span class="token class-name">L</span> <span class="token punctuation">{</span>
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<span class="token keyword">private</span> <span class="token keyword">boolean</span> myboolean <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/LMzMtR.png" alt="https://gitee.com/nicksxs/images/raw/master/uPic/LMzMtR.png"></p><p>可以看到变成了重量级锁。</p></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2021/06/20/%E8%81%8A%E8%81%8A-Java-%E4%B8%AD%E7%BB%95%E4%B8%8D%E5%BC%80%E7%9A%84-Synchronized-%E5%85%B3%E9%94%AE%E5%AD%97/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2021/06/20/%E8%81%8A%E8%81%8A-Java-%E4%B8%AD%E7%BB%95%E4%B8%8D%E5%BC%80%E7%9A%84-Synchronized-%E5%85%B3%E9%94%AE%E5%AD%97/" class="post-title-link" itemprop="url">聊聊 Java 中绕不开的 Synchronized 关键字</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2021-06-20 23:10:34" itemprop="dateCreated datePublished" datetime="2021-06-20T23:10:34+08:00">2021-06-20</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a> </span></span><span id="/2021/06/20/%E8%81%8A%E8%81%8A-Java-%E4%B8%AD%E7%BB%95%E4%B8%8D%E5%BC%80%E7%9A%84-Synchronized-%E5%85%B3%E9%94%AE%E5%AD%97/" class="post-meta-item leancloud_visitors" data-flag-title="聊聊 Java 中绕不开的 Synchronized 关键字" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2021/06/20/%E8%81%8A%E8%81%8A-Java-%E4%B8%AD%E7%BB%95%E4%B8%8D%E5%BC%80%E7%9A%84-Synchronized-%E5%85%B3%E9%94%AE%E5%AD%97/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2021/06/20/聊聊-Java-中绕不开的-Synchronized-关键字/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><p>Synchronized 关键字在 Java 的并发体系里也是非常重要的一个内容，首先比较常规的是知道它使用的方式，可以锁对象，可以锁代码块，也可以锁方法，看一个简单的 demo</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">SynchronizedDemo</span> <span class="token punctuation">{</span>
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<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">SynchronizedDemo</span> synchronizedDemo <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SynchronizedDemo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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synchronizedDemo<span class="token punctuation">.</span><span class="token function">lockMethod</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">public</span> <span class="token keyword">synchronized</span> <span class="token keyword">void</span> <span class="token function">lockMethod</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"here i'm locked"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">lockSynchronizedDemo</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">synchronized</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"here lock class"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>然后来查看反编译结果，其实代码（日光）之下并无新事，即使是完全不懂的也可以通过一些词义看出一些意义</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"> <span class="token class-name">Last</span> modified <span class="token number">2021</span>年<span class="token number">6</span>月<span class="token number">20</span>日<span class="token punctuation">;</span> size <span class="token number">729</span> bytes
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MD5 checksum dd9c529863bd7ff839a95481db578ad9
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<span class="token class-name">Compiled</span> from <span class="token string">"SynchronizedDemo.java"</span>
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<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">SynchronizedDemo</span>
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minor version<span class="token operator">:</span> <span class="token number">0</span>
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major version<span class="token operator">:</span> <span class="token number">53</span>
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flags<span class="token operator">:</span> <span class="token punctuation">(</span><span class="token number">0x0021</span><span class="token punctuation">)</span> ACC_PUBLIC<span class="token punctuation">,</span> ACC_SUPER
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this_class<span class="token operator">:</span> #<span class="token number">2</span> <span class="token comment">// SynchronizedDemo</span>
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super_class<span class="token operator">:</span> #<span class="token number">9</span> <span class="token comment">// java/lang/Object</span>
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interfaces<span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span> fields<span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span> methods<span class="token operator">:</span> <span class="token number">4</span><span class="token punctuation">,</span> attributes<span class="token operator">:</span> <span class="token number">1</span>
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<span class="token class-name">Constant</span> pool<span class="token operator">:</span>
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#<span class="token number">1</span> <span class="token operator">=</span> <span class="token class-name">Methodref</span> #<span class="token number">9.</span>#<span class="token number">22</span> <span class="token comment">// java/lang/Object."<init>":()V</span>
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#<span class="token number">2</span> <span class="token operator">=</span> <span class="token class-name">Class</span> #<span class="token number">23</span> <span class="token comment">// SynchronizedDemo</span>
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#<span class="token number">3</span> <span class="token operator">=</span> <span class="token class-name">Methodref</span> #<span class="token number">2.</span>#<span class="token number">22</span> <span class="token comment">// SynchronizedDemo."<init>":()V</span>
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#<span class="token number">4</span> <span class="token operator">=</span> <span class="token class-name">Methodref</span> #<span class="token number">2.</span>#<span class="token number">24</span> <span class="token comment">// SynchronizedDemo.lockMethod:()V</span>
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#<span class="token number">5</span> <span class="token operator">=</span> <span class="token class-name">Fieldref</span> #<span class="token number">25.</span>#<span class="token number">26</span> <span class="token comment">// java/lang/System.out:Ljava/io/PrintStream;</span>
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#<span class="token number">6</span> <span class="token operator">=</span> <span class="token class-name">String</span> #<span class="token number">27</span> <span class="token comment">// here i\'m locked</span>
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#<span class="token number">7</span> <span class="token operator">=</span> <span class="token class-name">Methodref</span> #<span class="token number">28.</span>#<span class="token number">29</span> <span class="token comment">// java/io/PrintStream.println:(Ljava/lang/String;)V</span>
|
|
#<span class="token number">8</span> <span class="token operator">=</span> <span class="token class-name">String</span> #<span class="token number">30</span> <span class="token comment">// here lock class</span>
|
|
#<span class="token number">9</span> <span class="token operator">=</span> <span class="token class-name">Class</span> #<span class="token number">31</span> <span class="token comment">// java/lang/Object</span>
|
|
#<span class="token number">10</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> <span class="token generics"><span class="token punctuation"><</span>init<span class="token punctuation">></span></span>
|
|
#<span class="token number">11</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> <span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token class-name">V</span>
|
|
#<span class="token number">12</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> <span class="token class-name">Code</span>
|
|
#<span class="token number">13</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> <span class="token class-name">LineNumberTable</span>
|
|
#<span class="token number">14</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> main
|
|
#<span class="token number">15</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> <span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token class-name">Ljava</span><span class="token operator">/</span>lang<span class="token operator">/</span><span class="token class-name">String</span><span class="token punctuation">;</span><span class="token punctuation">)</span><span class="token class-name">V</span>
|
|
#<span class="token number">16</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> lockMethod
|
|
#<span class="token number">17</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> lockSynchronizedDemo
|
|
#<span class="token number">18</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> <span class="token class-name">StackMapTable</span>
|
|
#<span class="token number">19</span> <span class="token operator">=</span> <span class="token class-name">Class</span> #<span class="token number">32</span> <span class="token comment">// java/lang/Throwable</span>
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|
#<span class="token number">20</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> <span class="token class-name">SourceFile</span>
|
|
#<span class="token number">21</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> <span class="token class-name">SynchronizedDemo</span><span class="token punctuation">.</span>java
|
|
#<span class="token number">22</span> <span class="token operator">=</span> <span class="token class-name">NameAndType</span> #<span class="token number">10</span><span class="token operator">:</span>#<span class="token number">11</span> <span class="token comment">// "<init>":()V</span>
|
|
#<span class="token number">23</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> <span class="token class-name">SynchronizedDemo</span>
|
|
#<span class="token number">24</span> <span class="token operator">=</span> <span class="token class-name">NameAndType</span> #<span class="token number">16</span><span class="token operator">:</span>#<span class="token number">11</span> <span class="token comment">// lockMethod:()V</span>
|
|
#<span class="token number">25</span> <span class="token operator">=</span> <span class="token class-name">Class</span> #<span class="token number">33</span> <span class="token comment">// java/lang/System</span>
|
|
#<span class="token number">26</span> <span class="token operator">=</span> <span class="token class-name">NameAndType</span> #<span class="token number">34</span><span class="token operator">:</span>#<span class="token number">35</span> <span class="token comment">// out:Ljava/io/PrintStream;</span>
|
|
#<span class="token number">27</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> here i\'m locked
|
|
#<span class="token number">28</span> <span class="token operator">=</span> <span class="token class-name">Class</span> #<span class="token number">36</span> <span class="token comment">// java/io/PrintStream</span>
|
|
#<span class="token number">29</span> <span class="token operator">=</span> <span class="token class-name">NameAndType</span> #<span class="token number">37</span><span class="token operator">:</span>#<span class="token number">38</span> <span class="token comment">// println:(Ljava/lang/String;)V</span>
|
|
#<span class="token number">30</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> here lock <span class="token keyword">class</span>
|
|
#<span class="token number">31</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> java<span class="token operator">/</span>lang<span class="token operator">/</span><span class="token class-name">Object</span>
|
|
#<span class="token number">32</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> java<span class="token operator">/</span>lang<span class="token operator">/</span><span class="token class-name">Throwable</span>
|
|
#<span class="token number">33</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> java<span class="token operator">/</span>lang<span class="token operator">/</span><span class="token class-name">System</span>
|
|
#<span class="token number">34</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> out
|
|
#<span class="token number">35</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> <span class="token class-name">Ljava</span><span class="token operator">/</span>io<span class="token operator">/</span><span class="token class-name">PrintStream</span><span class="token punctuation">;</span>
|
|
#<span class="token number">36</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> java<span class="token operator">/</span>io<span class="token operator">/</span><span class="token class-name">PrintStream</span>
|
|
#<span class="token number">37</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> println
|
|
#<span class="token number">38</span> <span class="token operator">=</span> <span class="token class-name">Utf8</span> <span class="token punctuation">(</span><span class="token class-name">Ljava</span><span class="token operator">/</span>lang<span class="token operator">/</span><span class="token class-name">String</span><span class="token punctuation">;</span><span class="token punctuation">)</span><span class="token class-name">V</span>
|
|
<span class="token punctuation">{</span>
|
|
<span class="token keyword">public</span> <span class="token class-name">SynchronizedDemo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
descriptor<span class="token operator">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token class-name">V</span>
|
|
flags<span class="token operator">:</span> <span class="token punctuation">(</span><span class="token number">0x0001</span><span class="token punctuation">)</span> ACC_PUBLIC
|
|
<span class="token class-name">Code</span><span class="token operator">:</span>
|
|
stack<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">,</span> locals<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">,</span> args_size<span class="token operator">=</span><span class="token number">1</span>
|
|
<span class="token number">0</span><span class="token operator">:</span> aload_0
|
|
<span class="token number">1</span><span class="token operator">:</span> invokespecial #<span class="token number">1</span> <span class="token comment">// Method java/lang/Object."<init>":()V</span>
|
|
<span class="token number">4</span><span class="token operator">:</span> <span class="token keyword">return</span>
|
|
<span class="token class-name">LineNumberTable</span><span class="token operator">:</span>
|
|
line <span class="token number">5</span><span class="token operator">:</span> <span class="token number">0</span>
|
|
|
|
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name"><span class="token namespace">java<span class="token punctuation">.</span>lang<span class="token punctuation">.</span></span>String</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
descriptor<span class="token operator">:</span> <span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token class-name">Ljava</span><span class="token operator">/</span>lang<span class="token operator">/</span><span class="token class-name">String</span><span class="token punctuation">;</span><span class="token punctuation">)</span><span class="token class-name">V</span>
|
|
flags<span class="token operator">:</span> <span class="token punctuation">(</span><span class="token number">0x0009</span><span class="token punctuation">)</span> ACC_PUBLIC<span class="token punctuation">,</span> ACC_STATIC
|
|
<span class="token class-name">Code</span><span class="token operator">:</span>
|
|
stack<span class="token operator">=</span><span class="token number">2</span><span class="token punctuation">,</span> locals<span class="token operator">=</span><span class="token number">2</span><span class="token punctuation">,</span> args_size<span class="token operator">=</span><span class="token number">1</span>
|
|
<span class="token number">0</span><span class="token operator">:</span> <span class="token keyword">new</span> #<span class="token number">2</span> <span class="token comment">// class SynchronizedDemo</span>
|
|
<span class="token number">3</span><span class="token operator">:</span> dup
|
|
<span class="token number">4</span><span class="token operator">:</span> invokespecial #<span class="token number">3</span> <span class="token comment">// Method "<init>":()V</span>
|
|
<span class="token number">7</span><span class="token operator">:</span> astore_1
|
|
<span class="token number">8</span><span class="token operator">:</span> aload_1
|
|
<span class="token number">9</span><span class="token operator">:</span> invokevirtual #<span class="token number">4</span> <span class="token comment">// Method lockMethod:()V</span>
|
|
<span class="token number">12</span><span class="token operator">:</span> <span class="token keyword">return</span>
|
|
<span class="token class-name">LineNumberTable</span><span class="token operator">:</span>
|
|
line <span class="token number">8</span><span class="token operator">:</span> <span class="token number">0</span>
|
|
line <span class="token number">9</span><span class="token operator">:</span> <span class="token number">8</span>
|
|
line <span class="token number">10</span><span class="token operator">:</span> <span class="token number">12</span>
|
|
|
|
<span class="token keyword">public</span> <span class="token keyword">synchronized</span> <span class="token keyword">void</span> <span class="token function">lockMethod</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
descriptor<span class="token operator">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token class-name">V</span>
|
|
flags<span class="token operator">:</span> <span class="token punctuation">(</span><span class="token number">0x0021</span><span class="token punctuation">)</span> ACC_PUBLIC<span class="token punctuation">,</span> ACC_SYNCHRONIZED
|
|
<span class="token class-name">Code</span><span class="token operator">:</span>
|
|
stack<span class="token operator">=</span><span class="token number">2</span><span class="token punctuation">,</span> locals<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">,</span> args_size<span class="token operator">=</span><span class="token number">1</span>
|
|
<span class="token number">0</span><span class="token operator">:</span> getstatic #<span class="token number">5</span> <span class="token comment">// Field java/lang/System.out:Ljava/io/PrintStream;</span>
|
|
<span class="token number">3</span><span class="token operator">:</span> ldc #<span class="token number">6</span> <span class="token comment">// String here i\'m locked</span>
|
|
<span class="token number">5</span><span class="token operator">:</span> invokevirtual #<span class="token number">7</span> <span class="token comment">// Method java/io/PrintStream.println:(Ljava/lang/String;)V</span>
|
|
<span class="token number">8</span><span class="token operator">:</span> <span class="token keyword">return</span>
|
|
<span class="token class-name">LineNumberTable</span><span class="token operator">:</span>
|
|
line <span class="token number">13</span><span class="token operator">:</span> <span class="token number">0</span>
|
|
line <span class="token number">14</span><span class="token operator">:</span> <span class="token number">8</span>
|
|
|
|
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">lockSynchronizedDemo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
descriptor<span class="token operator">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token class-name">V</span>
|
|
flags<span class="token operator">:</span> <span class="token punctuation">(</span><span class="token number">0x0001</span><span class="token punctuation">)</span> ACC_PUBLIC
|
|
<span class="token class-name">Code</span><span class="token operator">:</span>
|
|
stack<span class="token operator">=</span><span class="token number">2</span><span class="token punctuation">,</span> locals<span class="token operator">=</span><span class="token number">3</span><span class="token punctuation">,</span> args_size<span class="token operator">=</span><span class="token number">1</span>
|
|
<span class="token number">0</span><span class="token operator">:</span> aload_0
|
|
<span class="token number">1</span><span class="token operator">:</span> dup
|
|
<span class="token number">2</span><span class="token operator">:</span> astore_1
|
|
<span class="token number">3</span><span class="token operator">:</span> monitorenter
|
|
<span class="token number">4</span><span class="token operator">:</span> getstatic #<span class="token number">5</span> <span class="token comment">// Field java/lang/System.out:Ljava/io/PrintStream;</span>
|
|
<span class="token number">7</span><span class="token operator">:</span> ldc #<span class="token number">8</span> <span class="token comment">// String here lock class</span>
|
|
<span class="token number">9</span><span class="token operator">:</span> invokevirtual #<span class="token number">7</span> <span class="token comment">// Method java/io/PrintStream.println:(Ljava/lang/String;)V</span>
|
|
<span class="token number">12</span><span class="token operator">:</span> aload_1
|
|
<span class="token number">13</span><span class="token operator">:</span> monitorexit
|
|
<span class="token number">14</span><span class="token operator">:</span> <span class="token keyword">goto</span> <span class="token number">22</span>
|
|
<span class="token number">17</span><span class="token operator">:</span> astore_2
|
|
<span class="token number">18</span><span class="token operator">:</span> aload_1
|
|
<span class="token number">19</span><span class="token operator">:</span> monitorexit
|
|
<span class="token number">20</span><span class="token operator">:</span> aload_2
|
|
<span class="token number">21</span><span class="token operator">:</span> athrow
|
|
<span class="token number">22</span><span class="token operator">:</span> <span class="token keyword">return</span>
|
|
<span class="token class-name">Exception</span> table<span class="token operator">:</span>
|
|
from <span class="token keyword">to</span> <span class="token namespace">target</span> type
|
|
<span class="token number">4</span> <span class="token number">14</span> <span class="token number">17</span> any
|
|
<span class="token number">17</span> <span class="token number">20</span> <span class="token number">17</span> any
|
|
<span class="token class-name">LineNumberTable</span><span class="token operator">:</span>
|
|
line <span class="token number">17</span><span class="token operator">:</span> <span class="token number">0</span>
|
|
line <span class="token number">18</span><span class="token operator">:</span> <span class="token number">4</span>
|
|
line <span class="token number">19</span><span class="token operator">:</span> <span class="token number">12</span>
|
|
line <span class="token number">20</span><span class="token operator">:</span> <span class="token number">22</span>
|
|
<span class="token class-name">StackMapTable</span><span class="token operator">:</span> number_of_entries <span class="token operator">=</span> <span class="token number">2</span>
|
|
frame_type <span class="token operator">=</span> <span class="token number">255</span> <span class="token comment">/* full_frame */</span>
|
|
offset_delta <span class="token operator">=</span> <span class="token number">17</span>
|
|
locals <span class="token operator">=</span> <span class="token punctuation">[</span> <span class="token keyword">class</span> <span class="token class-name">SynchronizedDemo</span><span class="token punctuation">,</span> <span class="token keyword">class</span> java<span class="token operator">/</span>lang<span class="token operator">/</span><span class="token class-name">Object</span> <span class="token punctuation">]</span>
|
|
stack <span class="token operator">=</span> <span class="token punctuation">[</span> <span class="token keyword">class</span> java<span class="token operator">/</span>lang<span class="token operator">/</span><span class="token class-name">Throwable</span> <span class="token punctuation">]</span>
|
|
frame_type <span class="token operator">=</span> <span class="token number">250</span> <span class="token comment">/* chop */</span>
|
|
offset_delta <span class="token operator">=</span> <span class="token number">4</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token class-name">SourceFile</span><span class="token operator">:</span> <span class="token string">"SynchronizedDemo.java"</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>其中<code>lockMethod</code>中可以看到是通过 <code>ACC_SYNCHRONIZED</code> flag 来标记是被 synchronized 修饰，前面的 ACC 应该是 access 的意思，并且通过 <code>ACC_PUBLIC</code> 也可以看出来他们是同一类访问权限关键字来控制的，而修饰类则是通过<code>3: monitorenter</code>和<code>13: monitorexit</code>来控制并发，这个是原来就知道，后来看了下才知道修饰方法是不一样的，但是在前期都比较诟病是 synchronized 的性能，像 monitor 也是通过操作系统的<code>mutex lock</code>互斥锁来实现的，相对是比较重的锁，于是在 JDK 1.6 之后对 synchronized 做了一系列优化，包括偏向锁，轻量级锁，并且包括像 ConcurrentHashMap 这类并发集合都有在使用 synchronized 关键字配合 cas 来做并发保护，</p><p>jdk 对于 synchronized 的优化主要在于多重状态锁的升级，最初会使用偏向锁，当一个线程访问同步块并获取锁时，会在对象头和栈帧中的锁记录里存储锁偏向的线程ID，以后该线程在进入和退出同步块时不需要进行CAS操作来加锁和解锁，只需简单地测试一下对象头的Mark Word里是否存储着指向当前线程的偏向锁。引入偏向锁是为了在无多线程竞争的情况下尽量减少不必要的轻量级锁执行路径，因为轻量级锁的获取及释放依赖多次CAS原子指令，而偏向锁只需要在置换ThreadID的时候依赖一次CAS原子指令（由于一旦出现多线程竞争的情况就必须撤销偏向锁，所以偏向锁的撤销操作的性能损耗必须小于节省下来的CAS原子指令的性能消耗）。<br>而当出现线程尝试进入同步块时发现已有偏向锁，并且是其他线程时，会将锁升级成轻量级锁，并且自旋尝试获取锁，如果自旋成功则表示获取轻量级锁成功，否则将会升级成重量级锁进行阻塞，当然这里具体的还很复杂，说的比较浅薄主体还是想将原先的阻塞互斥锁进行轻量化，区分特殊情况进行加锁。</p></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><nav 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