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190 KiB
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Theme: Default
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Description: Original highlight.js style
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License: see project LICENSE
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Touched: 2021
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rel=tag>Mybatis</a><span class=tag-list-count>13</span><li class=tag-list-item><a class=tag-list-link href=/tags/Mysql/ rel=tag>Mysql</a><span class=tag-list-count>13</span><li class=tag-list-item><a class=tag-list-link href=/tags/NameServer/ rel=tag>NameServer</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/PHP/ rel=tag>PHP</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/Preorder-Traversal/ rel=tag>Preorder Traversal</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Print-FooBar-Alternately/ rel=tag>Print FooBar Alternately</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/RPC/ rel=tag>RPC</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/Redis/ rel=tag>Redis</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/Remove-Duplicates-from-Sorted-List/ rel=tag>Remove Duplicates from Sorted List</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/RocketMQ/ rel=tag>RocketMQ</a><span class=tag-list-count>9</span><li class=tag-list-item><a class=tag-list-link href=/tags/Rotate-Image/ rel=tag>Rotate Image</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Rust/ rel=tag>Rust</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/SPI/ rel=tag>SPI</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/Servlet/ rel=tag>Servlet</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Sharding-Jdbc/ rel=tag>Sharding-Jdbc</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/Shift-2D-Grid/ rel=tag>Shift 2D Grid</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Singleton/ rel=tag>Singleton</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Spring/ rel=tag>Spring</a><span class=tag-list-count>7</span><li class=tag-list-item><a class=tag-list-link href=/tags/Spring-Event/ rel=tag>Spring Event</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/SpringBoot/ rel=tag>SpringBoot</a><span class=tag-list-count>22</span><li class=tag-list-item><a class=tag-list-link href=/tags/Sql%E6%B3%A8%E5%85%A5/ rel=tag>Sql注入</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Stream/ rel=tag>Stream</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Synchronized/ rel=tag>Synchronized</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/Thread-dump/ rel=tag>Thread dump</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/ThreadLocal/ rel=tag>ThreadLocal</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/ThreadPool/ rel=tag>ThreadPool</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Tomcat/ rel=tag>Tomcat</a><span class=tag-list-count>13</span><li class=tag-list-item><a class=tag-list-link href=/tags/Trapping-Rain-Water/ rel=tag>Trapping Rain Water</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/WeakReference/ rel=tag>WeakReference</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Web/ rel=tag>Web</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Webhook/ rel=tag>Webhook</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Windows/ rel=tag>Windows</a><span class=tag-list-count>5</span><li class=tag-list-item><a class=tag-list-link href=/tags/WordPress/ rel=tag>WordPress</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/aqs/ rel=tag>aqs</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/await/ rel=tag>await</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/bloom-filter/ rel=tag>bloom filter</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/c/ rel=tag>c++</a><span class=tag-list-count>14</span><li class=tag-list-item><a class=tag-list-link href=/tags/cglib/ rel=tag>cglib</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/cgroup/ rel=tag>cgroup</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/cluster/ rel=tag>cluster</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/condition/ rel=tag>condition</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/dnsmasq/ rel=tag>dnsmasq</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/docker/ rel=tag>docker</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/dp/ rel=tag>dp</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/dubbo/ rel=tag>dubbo</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/echo/ rel=tag>echo</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/environment/ rel=tag>environment</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/gap-lock/ rel=tag>gap lock</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/gc/ rel=tag>gc</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/git/ rel=tag>git</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/grep/ rel=tag>grep</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/hadoop/ rel=tag>hadoop</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/headscale/ rel=tag>headscale</a><span class=tag-list-count>6</span><li class=tag-list-item><a class=tag-list-link href=/tags/hexo/ rel=tag>hexo</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/http/ rel=tag>http</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/icu4c/ rel=tag>icu4c</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/im/ rel=tag>im</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/is-not-null/ rel=tag>is not null</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/is-null/ rel=tag>is null</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/java/ rel=tag>java</a><span class=tag-list-count>54</span><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 class=tag-list-item><a class=tag-list-link href=/tags/leetcode/ rel=tag>leetcode</a><span class=tag-list-count>44</span><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 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 class=tag-list-item><a class=tag-list-link href=/tags/linux/ rel=tag>linux</a><span class=tag-list-count>7</span><li class=tag-list-item><a class=tag-list-link href=/tags/lock/ rel=tag>lock</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/mac/ rel=tag>mac</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/mfc/ rel=tag>mfc</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/min-stack/ rel=tag>min stack</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/mq/ rel=tag>mq</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/mvcc/ rel=tag>mvcc</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/mysql/ rel=tag>mysql</a><span class=tag-list-count>9</span><li class=tag-list-item><a class=tag-list-link href=/tags/namespace/ rel=tag>namespace</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/nas/ rel=tag>nas</a><span class=tag-list-count>6</span><li class=tag-list-item><a class=tag-list-link href=/tags/next-key-lock/ rel=tag>next-key lock</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/nginx/ rel=tag>nginx</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/nullsfirst/ rel=tag>nullsfirst</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/openresty/ rel=tag>openresty</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/openwrt/ rel=tag>openwrt</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/php/ rel=tag>php</a><span class=tag-list-count>6</span><li class=tag-list-item><a class=tag-list-link href=/tags/powershell/ rel=tag>powershell</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/procedure/ rel=tag>procedure</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/python/ rel=tag>python</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/read-view/ rel=tag>read view</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/redis/ rel=tag>redis</a><span class=tag-list-count>12</span><li class=tag-list-item><a class=tag-list-link href=/tags/scp/ rel=tag>scp</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/sort/ rel=tag>sort</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/ssh/ rel=tag>ssh</a><span class=tag-list-count>3</span><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 class=tag-list-item><a class=tag-list-link href=/tags/stream/ rel=tag>stream</a><span class=tag-list-count>3</span><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 class=tag-list-item><a class=tag-list-link href=/tags/swoole/ rel=tag>swoole</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/trace/ rel=tag>trace</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/unlock/ rel=tag>unlock</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8/ rel=tag>utf8</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8mb4/ rel=tag>utf8mb4</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8mb4-0900-ai-ci/ rel=tag>utf8mb4_0900_ai_ci</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8mb4-general-ci/ rel=tag>utf8mb4_general_ci</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8mb4-unicode-ci/ rel=tag>utf8mb4_unicode_ci</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/websocket/ rel=tag>websocket</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/windows/ rel=tag>windows</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/wsl/ rel=tag>wsl</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/zookeeper/ rel=tag>zookeeper</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/zsh/ rel=tag>zsh</a><span class=tag-list-count>2</span><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 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 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 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 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 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 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 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 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 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 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 class=tag-list-item><a class=tag-list-link href=/tags/%E4%BA%91%E6%9C%8D%E5%8A%A1%E5%99%A8/ rel=tag>云服务器</a><span class=tag-list-count>1</span><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 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 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 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 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 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>3</span><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 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 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 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 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>7</span><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 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 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 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 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 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 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 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 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 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 class=tag-list-item><a class=tag-list-link href=/tags/%E5%8E%A6%E9%97%A8/ rel=tag>厦门</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE/ rel=tag>双亲委派</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8F%91%E8%A1%8C%E7%89%88/ rel=tag>发行版</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8F%A3%E7%BD%A9/ rel=tag>口罩</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/ rel=tag>可变引用</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%90%90%E6%A7%BD/ rel=tag>吐槽</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%9B%A4%E7%89%A9%E8%B5%84/ rel=tag>囤物资</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6/ rel=tag>垃圾回收</a><span class=tag-list-count>1</span><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 class=tag-list-item><a class=tag-list-link href=/tags/%E5%A4%A7%E6%89%AB%E9%99%A4/ rel=tag>大扫除</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%AD%97%E7%AC%A6%E9%9B%86/ rel=tag>字符集</a><span class=tag-list-count>1</span><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 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 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 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 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>10</span><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 class=tag-list-item><a class=tag-list-link href=/tags/%E5%B7%A5%E5%85%B7/ rel=tag>工具</a><span class=tag-list-count>3</span><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 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>6</span><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 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>4</span><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 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 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 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 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 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 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 class=tag-list-item><a class=tag-list-link href=/tags/%E6%81%B6%E6%84%8F%E7%9B%97%E5%88%B7/ rel=tag>恶意盗刷</a><span class=tag-list-count>3</span><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 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 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 class=tag-list-item><a class=tag-list-link href=/tags/%E6%8A%80%E5%B7%A7/ rel=tag>技巧</a><span class=tag-list-count>2</span><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 class=tag-list-item><a class=tag-list-link href=/tags/%E6%8A%98%E8%85%BE/ rel=tag>折腾</a><span class=tag-list-count>3</span><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>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8D%A2%E8%BD%A6%E7%89%8C/ rel=tag>换车牌</a><span class=tag-list-count>1</span><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 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 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 class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/ rel=tag>数据结构</a><span class=tag-list-count>11</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%96%B0%E8%AF%AD%E8%A8%80/ rel=tag>新语言</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%97%85%E6%B8%B8/ rel=tag>旅游</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%97%A5%E5%BF%97/ rel=tag>日志</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%9B%BE%E5%8E%9D%E5%9E%B5/ rel=tag>曾厝垵</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%9C%80%E5%B0%8F%E6%A0%88/ rel=tag>最小栈</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%9D%80%E4%BA%BA%E8%AF%9B%E5%BF%83/ rel=tag>杀人诛心</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%9D%AD%E5%B7%9E/ rel=tag>杭州</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%A0%87%E8%AE%B0%E6%95%B4%E7%90%86/ rel=tag>标记整理</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%A4%8D%E7%89%A9%E5%9B%AD/ rel=tag>植物园</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B2%99%E8%8C%B6%E9%9D%A2/ rel=tag>沙茶面</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B3%A8%E8%A7%A3/ rel=tag>注解</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B5%B7%E8%9B%8E%E7%85%8E/ rel=tag>海蛎煎</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97/ rel=tag>消息队列</a><span class=tag-list-count>9</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B7%98%E6%B1%B0%E7%AD%96%E7%95%A5/ rel=tag>淘汰策略</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B7%B1%E5%BA%A6%E5%AD%A6%E4%B9%A0/ rel=tag>深度学习</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%BA%90%E7%A0%81/ rel=tag>源码</a><span class=tag-list-count>11</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%BA%90%E7%A0%81%E8%A7%A3%E6%9E%90/ rel=tag>源码解析</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%94%9F%E6%B4%BB/ rel=tag>生活</a><span class=tag-list-count>42</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%94%B5%E7%93%B6%E8%BD%A6/ rel=tag>电瓶车</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%96%AB%E6%83%85/ rel=tag>疫情</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%9C%8B%E4%B9%A6/ rel=tag>看书</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%9C%8B%E5%89%A7/ rel=tag>看剧</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%9F%A9%E9%98%B5/ rel=tag>矩阵</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%AB%AF%E5%8F%A3%E8%BD%AC%E5%8F%91/ rel=tag>端口转发</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%AE%97%E6%B3%95/ rel=tag>算法</a><span class=tag-list-count>5</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%B1%BB%E5%8A%A0%E8%BD%BD/ rel=tag>类加载</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%B3%9F%E5%BF%83%E4%BA%8B/ rel=tag>糟心事</a><span class=tag-list-count>5</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%B4%A2%E5%BC%95/ rel=tag>索引</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BA%BF%E7%A8%8B%E6%B1%A0/ rel=tag>线程池</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%93%E5%AD%98/ rel=tag>缓存</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%93%E5%AD%98%E5%87%BB%E7%A9%BF/ rel=tag>缓存击穿</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%93%E5%AD%98%E7%A9%BF%E9%80%8F/ rel=tag>缓存穿透</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%93%E5%AD%98%E9%9B%AA%E5%B4%A9/ rel=tag>缓存雪崩</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%96%E7%A0%81/ rel=tag>编码</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BE%8E%E5%9B%BD/ rel=tag>美国</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%80%81%E7%94%B5%E8%84%91/ rel=tag>老电脑</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%87%AA%E5%8A%A8%E8%A3%85%E9%85%8D/ rel=tag>自动装配</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%87%AA%E6%97%8B/ rel=tag>自旋</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/ rel=tag>自适应拓展</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%A3%85%E7%94%B5%E8%84%91/ rel=tag>装电脑</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%A7%84%E5%88%99/ rel=tag>规则</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%A7%A3%E6%9E%90/ rel=tag>解析</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/ rel=tag>设计模式</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%AF%BB%E4%B9%A6/ rel=tag>读书</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%AF%BB%E5%90%8E%E6%84%9F/ rel=tag>读后感</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B4%9F%E8%BD%BD%E5%9D%87%E8%A1%A1/ rel=tag>负载均衡</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B6%B3%E7%90%83/ rel=tag>足球</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B7%91%E6%AD%A5/ rel=tag>跑步</a><span class=tag-list-count>7</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B7%AF%E6%94%BF%E8%A7%84%E5%88%92/ rel=tag>路政规划</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B7%AF%E7%94%B1%E5%99%A8/ rel=tag>路由器</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B7%B3%E6%B0%B4/ rel=tag>跳水</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B8%A9%E8%B8%8F/ rel=tag>踩踏</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%BD%AC%E4%B9%89/ rel=tag>转义</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%BD%BB%E9%87%8F%E7%BA%A7%E9%94%81/ rel=tag>轻量级锁</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%BF%87%E6%9C%9F%E7%AD%96%E7%95%A5/ rel=tag>过期策略</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%BF%90%E5%8A%A8/ rel=tag>运动</a><span class=tag-list-count>9</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%BF%9C%E7%A8%8B%E5%8A%9E%E5%85%AC/ rel=tag>远程办公</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E9%80%92%E5%BD%92/ rel=tag>递归</a><span class=tag-list-count>1</span><li 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href=/tags/%E9%BC%93%E6%B5%AA%E5%B1%BF/ rel=tag>鼓浪屿</a><span class=tag-list-count>1</span></ul></canvas></div></div></div></div></div><div class="sidebar-inner sidebar-blogroll"><div class="links-of-blogroll animated"><div class=links-of-blogroll-title><i class="fa fa-globe fa-fw"></i> 链接</div><ul class=links-of-blogroll-list><li class=links-of-blogroll-item><a href=https://covermusic.cn/ rel=noopener target=_blank title=https://covermusic.cn>69伙伴</a></ul></div></div></aside></div><div class="main-inner index posts-expand"><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2024/02/24/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%89%E7%AF%87/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2024/02/24/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%89%E7%AF%87/ itemprop=url>Java 线程池系列-第三篇</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 itemprop="dateCreated datePublished" title="创建时间：2024-02-24 23:09:57" datetime=2024-02-24T23:09:57+08:00>2024-02-24</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 class="post-meta-item leancloud_visitors" data-flag-title="Java 线程池系列-第三篇" id=/2024/02/24/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%89%E7%AF%87/ 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 href=/2024/02/24/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%89%E7%AF%87/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2024/02/24/Java-线程池系列-第三篇/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>第三篇我们要来讲下 Worker 这个“打工人”，线程池里实际在干活的同学<br>Worker 实现了 Runnable 接口，所以在前面介绍的 <code>addWorker</code> 中<br>线程启动其实就调用了下面的 run 方法，而 run 方法则调用了内部的<br><code>runWorker</code> 方法<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br></pre><td class=code><pre><span class=line></span><br><span class=line><span class=keyword>private</span> <span class=keyword>final</span> <span class=keyword>class</span> <span class="title class_">Worker</span></span><br><span class=line> <span class=keyword>extends</span> <span class="title class_">AbstractQueuedSynchronizer</span></span><br><span class=line> <span class=keyword>implements</span> <span class="title class_">Runnable</span></span><br><span class=line>{</span><br><span class=line> <span class=comment>/**</span></span><br><span class=line><span class=comment> * This class will never be serialized, but we provide a</span></span><br><span class=line><span class=comment> * serialVersionUID to suppress a javac warning.</span></span><br><span class=line><span class=comment> */</span></span><br><span class=line> <span class=keyword>private</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>long</span> <span class=variable>serialVersionUID</span> <span class=operator>=</span> <span class=number>6138294804551838833L</span>;</span><br><span class=line></span><br><span class=line> <span class=comment>/** Thread this worker is running in. Null if factory fails. */</span></span><br><span class=line> <span class=keyword>final</span> Thread thread;</span><br><span class=line> <span class=comment>/** Initial task to run. Possibly null. */</span></span><br><span class=line> Runnable firstTask;</span><br><span class=line> <span class=comment>/** Per-thread task counter */</span></span><br><span class=line> <span class=keyword>volatile</span> <span class=type>long</span> completedTasks;</span><br><span class=line></span><br><span class=line> <span class=comment>/**</span></span><br><span class=line><span class=comment> * Creates with given first task and thread from ThreadFactory.</span></span><br><span class=line><span class=comment> * <span class=doctag>@param</span> firstTask the first task (null if none)</span></span><br><span class=line><span class=comment> */</span></span><br><span class=line> Worker(Runnable firstTask) {</span><br><span class=line> setState(-<span class=number>1</span>); <span class=comment>// inhibit interrupts until runWorker</span></span><br><span class=line> <span class=built_in>this</span>.firstTask = firstTask;</span><br><span class=line> <span class=built_in>this</span>.thread = getThreadFactory().newThread(<span class=built_in>this</span>);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>/** Delegates main run loop to outer runWorker */</span></span><br><span class=line> <span class=comment>// 启动线程 Worker</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">run</span><span class=params>()</span> {</span><br><span class=line> runWorker(<span class=built_in>this</span>);</span><br><span class=line> }</span><br></pre></table></figure><p>介绍下这个 <code>runWorker</code> 方法<br>这里就会先处理 firstTask，如果 firstTask 是 null 则会去队列里取<br>里面会有两个钩子，一个是执行前，一个是执行后，注意这个循环是没有常规<br>退出逻辑的，说明是一直在往队列里获取，除非获取队列里的任务超时失败了<br>这样就到最后会去执行 <code>processWorkerExit</code><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br></pre><td class=code><pre><span class=line><span class=keyword>final</span> <span class=keyword>void</span> <span class="title function_">runWorker</span><span class=params>(Worker w)</span> {</span><br><span class=line> <span class=type>Thread</span> <span class=variable>wt</span> <span class=operator>=</span> Thread.currentThread();</span><br><span class=line> <span class=type>Runnable</span> <span class=variable>task</span> <span class=operator>=</span> w.firstTask;</span><br><span class=line> w.firstTask = <span class=literal>null</span>;</span><br><span class=line> w.unlock(); <span class=comment>// allow interrupts</span></span><br><span class=line> <span class=type>boolean</span> <span class=variable>completedAbruptly</span> <span class=operator>=</span> <span class=literal>true</span>;</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=comment>// firstTask 不为空或者从队列里获取到任务</span></span><br><span class=line> <span class=keyword>while</span> (task != <span class=literal>null</span> || (task = getTask()) != <span class=literal>null</span>) {</span><br><span class=line> w.lock();</span><br><span class=line> <span class=comment>// If pool is stopping, ensure thread is interrupted;</span></span><br><span class=line> <span class=comment>// if not, ensure thread is not interrupted. This</span></span><br><span class=line> <span class=comment>// requires a recheck in second case to deal with</span></span><br><span class=line> <span class=comment>// shutdownNow race while clearing interrupt</span></span><br><span class=line> <span class=keyword>if</span> ((runStateAtLeast(ctl.get(), STOP) ||</span><br><span class=line> (Thread.interrupted() &&</span><br><span class=line> runStateAtLeast(ctl.get(), STOP))) &&</span><br><span class=line> !wt.isInterrupted())</span><br><span class=line> wt.interrupt();</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=comment>// 前置执行钩子</span></span><br><span class=line> beforeExecute(wt, task);</span><br><span class=line> <span class=type>Throwable</span> <span class=variable>thrown</span> <span class=operator>=</span> <span class=literal>null</span>;</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=comment>// 任务执行</span></span><br><span class=line> task.run();</span><br><span class=line> } <span class=keyword>catch</span> (RuntimeException x) {</span><br><span class=line> thrown = x; <span class=keyword>throw</span> x;</span><br><span class=line> } <span class=keyword>catch</span> (Error x) {</span><br><span class=line> thrown = x; <span class=keyword>throw</span> x;</span><br><span class=line> } <span class=keyword>catch</span> (Throwable x) {</span><br><span class=line> thrown = x; <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">Error</span>(x);</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> <span class=comment>// 执行完后的钩子</span></span><br><span class=line> afterExecute(task, thrown);</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> <span class=comment>// 最后会执行到这，清空任务</span></span><br><span class=line> task = <span class=literal>null</span>;</span><br><span class=line> w.completedTasks++;</span><br><span class=line> w.unlock();</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> completedAbruptly = <span class=literal>false</span>;</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> <span class=comment>// 循环的最后就会去退出Worker</span></span><br><span class=line> processWorkerExit(w, completedAbruptly);</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>而这个 <code>processWorkerExit</code> 也有个比较特殊的逻辑<br>照理我们会想到这里可能就是线程在处理完队列里的任务<br>以后，就会判断下是否要退出，如果是核心线程的话就不用<br>如果是非核心线程就会退出了，但是这里其实有个替换逻辑<br>就是最后有个 addWorker 调用<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br></pre><td class=code><pre><span class=line><span class=keyword>private</span> <span class=keyword>void</span> <span class="title function_">processWorkerExit</span><span class=params>(Worker w, <span class=type>boolean</span> completedAbruptly)</span> {</span><br><span class=line> <span class=keyword>if</span> (completedAbruptly) <span class=comment>// If abrupt, then workerCount wasn't adjusted</span></span><br><span class=line> decrementWorkerCount();</span><br><span class=line></span><br><span class=line> <span class=keyword>final</span> <span class=type>ReentrantLock</span> <span class=variable>mainLock</span> <span class=operator>=</span> <span class=built_in>this</span>.mainLock;</span><br><span class=line> mainLock.lock();</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> completedTaskCount += w.completedTasks;</span><br><span class=line> workers.remove(w);</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> mainLock.unlock();</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> tryTerminate();</span><br><span class=line></span><br><span class=line> <span class=type>int</span> <span class=variable>c</span> <span class=operator>=</span> ctl.get();</span><br><span class=line> <span class=comment>// 判断状态</span></span><br><span class=line> <span class=keyword>if</span> (runStateLessThan(c, STOP)) {</span><br><span class=line> <span class=keyword>if</span> (!completedAbruptly) {</span><br><span class=line> <span class=comment>// 核心线程是否也需要退出</span></span><br><span class=line> <span class=type>int</span> <span class=variable>min</span> <span class=operator>=</span> allowCoreThreadTimeOut ? <span class=number>0</span> : corePoolSize;</span><br><span class=line> <span class=keyword>if</span> (min == <span class=number>0</span> && ! workQueue.isEmpty())</span><br><span class=line> min = <span class=number>1</span>;</span><br><span class=line> <span class=comment>// 这里代表非核心线程就可以不用替换，也就是回收线程了</span></span><br><span class=line> <span class=keyword>if</span> (workerCountOf(c) >= min)</span><br><span class=line> <span class=keyword>return</span>; <span class=comment>// replacement not needed</span></span><br><span class=line> }</span><br><span class=line> <span class=comment>// 否则是替换线程</span></span><br><span class=line> addWorker(<span class=literal>null</span>, <span class=literal>false</span>);</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>这里主要讲了线程 Worker 运行的逻辑</div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2024/02/18/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%BA%8C%E7%AF%87/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2024/02/18/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%BA%8C%E7%AF%87/ itemprop=url>Java 线程池系列-第二篇</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 itemprop="dateCreated datePublished" title="创建时间：2024-02-18 18:47:52" datetime=2024-02-18T18:47:52+08:00>2024-02-18</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/Java/ itemprop=url rel=index><span itemprop=name>Java</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="Java 线程池系列-第二篇" id=/2024/02/18/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%BA%8C%E7%AF%87/ 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 href=/2024/02/18/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%BA%8C%E7%AF%87/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2024/02/18/Java-线程池系列-第二篇/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>介绍了线程池的目的和实现概述，以及如何初始化的，我们就来开始看看线程池最重要的执行过程<br>老规矩，还是先把注释翻译下，这个对理解逻辑其实非常重要，后面可以循着注释的逻辑来看代码<br>第一步，如果是少于核心线程数的线程正在运行，那么尝试去开启一个新线程，并把提交的命令<br>command 最为 first task，这里调用了 addWorker，会自动检查运行状态和线程数，并通过<br>返回 false 来提示不应该增加线程，比如已经有其他任务先创建了线程导致已经超过了核心线程数<br>第二步，在前面不符合的情况下，也就是线程数已经大于等于核心线程数了或者在调用 addWorker<br>的时候校验发现线程数已经大于等于核心线程数或者线程池运行状态不是正在运行了就会进入下一个判断<br>首先还是判断线程池是否正在运行，然后将 command 放进队列，如果成功进队了，还需要再次进行校验<br>如果线程池状态不是正在运行了，则需要再出队，然后执行拒绝策略，如果状态正常，但是线程被回收完了<br>那需要创建线程<br>第三步，如果不能正常进队列，会尝试再启动一个新线程，这里表示核心线程数满了，并且队列也满了，<br>则需要再开启一个新线程，如果开启失败则执行拒绝策略<br>代码注释基本已经把代码讲得很详细了<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">execute</span><span class=params>(Runnable command)</span> {</span><br><span class=line> <span class=keyword>if</span> (command == <span class=literal>null</span>)</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">NullPointerException</span>();</span><br><span class=line> <span class=comment>/*</span></span><br><span class=line><span class=comment> * Proceed in 3 steps:</span></span><br><span class=line><span class=comment> *</span></span><br><span class=line><span class=comment> * 1. If fewer than corePoolSize threads are running, try to</span></span><br><span class=line><span class=comment> * start a new thread with the given command as its first</span></span><br><span class=line><span class=comment> * task. The call to addWorker atomically checks runState and</span></span><br><span class=line><span class=comment> * workerCount, and so prevents false alarms that would add</span></span><br><span class=line><span class=comment> * threads when it shouldn't, by returning false.</span></span><br><span class=line><span class=comment> *</span></span><br><span class=line><span class=comment> * 2. If a task can be successfully queued, then we still need</span></span><br><span class=line><span class=comment> * to double-check whether we should have added a thread</span></span><br><span class=line><span class=comment> * (because existing ones died since last checking) or that</span></span><br><span class=line><span class=comment> * the pool shut down since entry into this method. So we</span></span><br><span class=line><span class=comment> * recheck state and if necessary roll back the enqueuing if</span></span><br><span class=line><span class=comment> * stopped, or start a new thread if there are none.</span></span><br><span class=line><span class=comment> *</span></span><br><span class=line><span class=comment> * 3. If we cannot queue task, then we try to add a new</span></span><br><span class=line><span class=comment> * thread. If it fails, we know we are shut down or saturated</span></span><br><span class=line><span class=comment> * and so reject the task.</span></span><br><span class=line><span class=comment> */</span></span><br><span class=line> <span class=type>int</span> <span class=variable>c</span> <span class=operator>=</span> ctl.get();</span><br><span class=line> <span class=comment>// 这就是第一步</span></span><br><span class=line> <span class=keyword>if</span> (workerCountOf(c) < corePoolSize) {</span><br><span class=line> <span class=keyword>if</span> (addWorker(command, <span class=literal>true</span>))</span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> <span class=comment>// 注意这里是第一步可能失败了，获取一下最新的状态</span></span><br><span class=line> c = ctl.get();</span><br><span class=line> }</span><br><span class=line> <span class=comment>// 这里是第二步</span></span><br><span class=line> <span class=keyword>if</span> (isRunning(c) && workQueue.offer(command)) {</span><br><span class=line> <span class=comment>// 每次都获取最新的状态</span></span><br><span class=line> <span class=type>int</span> <span class=variable>recheck</span> <span class=operator>=</span> ctl.get();</span><br><span class=line> <span class=keyword>if</span> (! isRunning(recheck) && remove(command))</span><br><span class=line> reject(command);</span><br><span class=line> <span class=keyword>else</span> <span class=keyword>if</span> (workerCountOf(recheck) == <span class=number>0</span>)</span><br><span class=line> <span class=comment>// 这里是判断如果一个线程都没了的话，注意添加的是非核心线程</span></span><br><span class=line> addWorker(<span class=literal>null</span>, <span class=literal>false</span>);</span><br><span class=line> }</span><br><span class=line> <span class=comment>// 这里第三步是添加线程，并且是非核心线程</span></span><br><span class=line> <span class=keyword>else</span> <span class=keyword>if</span> (!addWorker(command, <span class=literal>false</span>))</span><br><span class=line> reject(command);</span><br><span class=line> }</span><br></pre></table></figure><p>这里面比较重要的就是 addWorker 方法，我们也来看一下<br>这里用到了 <code>break retry;</code> 就是在循环中跳出到这个 retry 的位置继续执行<br>然后还是获取运行状态，如果是非运行状态，<br>并且<code>rs == SHUTDOWN</code> 与 <code>firstTask == null</code> 和 <code>! workQueue.isEmpty()</code>，至少一个为false<br>因为只有当 SHUTDOWN 状态才会出现后面两者为 false 的情况，如果是 SHUTDOWN ，队列不为空还是需要执行完队列里的任务<br>然后是判断线程数量与传入参数 core 还有核心线程数跟最大线程数的对比，如果是超过了就返回 false 也就是外层的第一步的内部<br>if 就会继续执行后面的获取线程池状态，然后是 cas 增加线程数量，如果失败则 break 跳到方法开头，如果成功则继续重新获取 c<br>判断线程池运行状态，如果不一致则从外层继续进入<br>后面的就是新建一个 worker，然后获取锁，继续判断线程池状态，如果在运行中或者队列不为空（隐含条件）则继续执行添加 worker<br>并判断是否需要更新历史最大线程数，更改线程添加状态，然后启动线程，标记线程启动状态<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br><span class=line>57</span><br><span class=line>58</span><br><span class=line>59</span><br><span class=line>60</span><br><span class=line>61</span><br><span class=line>62</span><br><span class=line>63</span><br></pre><td class=code><pre><span class=line><span class=keyword>private</span> <span class=type>boolean</span> <span class="title function_">addWorker</span><span class=params>(Runnable firstTask, <span class=type>boolean</span> core)</span> {</span><br><span class=line> retry:</span><br><span class=line> <span class=keyword>for</span> (;;) {</span><br><span class=line> <span class=type>int</span> <span class=variable>c</span> <span class=operator>=</span> ctl.get();</span><br><span class=line> <span class=type>int</span> <span class=variable>rs</span> <span class=operator>=</span> runStateOf(c);</span><br><span class=line></span><br><span class=line> <span class=comment>// Check if queue empty only if necessary.</span></span><br><span class=line> <span class=keyword>if</span> (rs >= SHUTDOWN && ! (rs == SHUTDOWN && firstTask == <span class=literal>null</span> && ! workQueue.isEmpty()))</span><br><span class=line> <span class=keyword>return</span> <span class=literal>false</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>for</span> (;;) {</span><br><span class=line> <span class=type>int</span> <span class=variable>wc</span> <span class=operator>=</span> workerCountOf(c);</span><br><span class=line> <span class=keyword>if</span> (wc >= CAPACITY ||</span><br><span class=line> wc >= (core ? corePoolSize : maximumPoolSize))</span><br><span class=line> <span class=keyword>return</span> <span class=literal>false</span>;</span><br><span class=line> <span class=keyword>if</span> (compareAndIncrementWorkerCount(c))</span><br><span class=line> <span class=keyword>break</span> retry;</span><br><span class=line> c = ctl.get(); <span class=comment>// Re-read ctl</span></span><br><span class=line> <span class=keyword>if</span> (runStateOf(c) != rs)</span><br><span class=line> <span class=keyword>continue</span> retry;</span><br><span class=line> <span class=comment>// else CAS failed due to workerCount change; retry inner loop</span></span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>boolean</span> <span class=variable>workerStarted</span> <span class=operator>=</span> <span class=literal>false</span>;</span><br><span class=line> <span class=type>boolean</span> <span class=variable>workerAdded</span> <span class=operator>=</span> <span class=literal>false</span>;</span><br><span class=line> <span class=type>Worker</span> <span class=variable>w</span> <span class=operator>=</span> <span class=literal>null</span>;</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> w = <span class=keyword>new</span> <span class="title class_">Worker</span>(firstTask);</span><br><span class=line> <span class=keyword>final</span> <span class=type>Thread</span> <span class=variable>t</span> <span class=operator>=</span> w.thread;</span><br><span class=line> <span class=keyword>if</span> (t != <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>final</span> <span class=type>ReentrantLock</span> <span class=variable>mainLock</span> <span class=operator>=</span> <span class=built_in>this</span>.mainLock;</span><br><span class=line> mainLock.lock();</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=comment>// Recheck while holding lock.</span></span><br><span class=line> <span class=comment>// Back out on ThreadFactory failure or if</span></span><br><span class=line> <span class=comment>// shut down before lock acquired.</span></span><br><span class=line> <span class=type>int</span> <span class=variable>rs</span> <span class=operator>=</span> runStateOf(ctl.get());</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (rs < SHUTDOWN ||</span><br><span class=line> (rs == SHUTDOWN && firstTask == <span class=literal>null</span>)) {</span><br><span class=line> <span class=keyword>if</span> (t.isAlive()) <span class=comment>// precheck that t is startable</span></span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">IllegalThreadStateException</span>();</span><br><span class=line> workers.add(w);</span><br><span class=line> <span class=type>int</span> <span class=variable>s</span> <span class=operator>=</span> workers.size();</span><br><span class=line> <span class=keyword>if</span> (s > largestPoolSize)</span><br><span class=line> largestPoolSize = s;</span><br><span class=line> workerAdded = <span class=literal>true</span>;</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> mainLock.unlock();</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (workerAdded) {</span><br><span class=line> t.start();</span><br><span class=line> workerStarted = <span class=literal>true</span>;</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> <span class=keyword>if</span> (! workerStarted)</span><br><span class=line> addWorkerFailed(w);</span><br><span class=line> }</span><br><span class=line> <span class=keyword>return</span> workerStarted;</span><br><span class=line> }</span><br></pre></table></figure><p>后面会继续讲下线程如何执行队列里的任务</div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2024/02/11/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%80%E7%AF%87/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2024/02/11/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%80%E7%AF%87/ itemprop=url>Java 线程池系列-第一篇</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 itemprop="dateCreated datePublished" title="创建时间：2024-02-11 19:39:05 / 修改时间：19:52:10" datetime=2024-02-11T19:39:05+08:00>2024-02-11</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><span class="post-meta-item leancloud_visitors" data-flag-title="Java 线程池系列-第一篇" id=/2024/02/11/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%80%E7%AF%87/ 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 href=/2024/02/11/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E7%AC%AC%E4%B8%80%E7%AF%87/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2024/02/11/Java-线程池系列-第一篇/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>这一篇我们继续聊线程池，一般线程池会介绍我们的参数，我先不一样一些<br>我们先来翻译一下<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span 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class=line>88</span><br><span class=line>89</span><br><span class=line>90</span><br><span class=line>91</span><br><span class=line>92</span><br><span class=line>93</span><br><span class=line>94</span><br><span class=line>95</span><br></pre><td class=code><pre><span class=line> An {<span class=meta>@link</span> ExecutorService} that executes each submitted task using</span><br><span class=line> one of possibly several pooled threads, normally configured</span><br><span class=line> using {<span class=meta>@link</span> Executors} factory methods.</span><br><span class=line> <span class=comment>// executorService 使用一个线程池中的线程来执行每个提交的任务，经常使用 Executors 工厂方法</span></span><br><span class=line></span><br><span class=line> <p>Thread pools address two different problems: they usually</span><br><span class=line> provide improved performance when executing large numbers of</span><br><span class=line> asynchronous tasks, due to reduced per-task invocation overhead,</span><br><span class=line> and they provide a means of bounding and managing the resources,</span><br><span class=line> including threads, consumed when executing a collection of tasks.</span><br><span class=line> Each {<span class=meta>@code</span> ThreadPoolExecutor} also maintains some basic</span><br><span class=line> statistics, such as the number of completed tasks.</span><br><span class=line> <span class=comment>// 线程池解决两个不同的问题，通常是为了在提交大量异步任务时，通过减少每个任务的调度开销来提高性能</span></span><br><span class=line> <span class=comment>// 并且提供了一种管理和约束资源，包括线程消耗的方法，每个 ThreadPoolExecutor还会管理一些基础的统计信息</span></span><br><span class=line> <span class=comment>// 比如完成的任务数量</span></span><br><span class=line> </span><br><span class=line></span><br><span class=line> <p>To be useful across a wide range of contexts, <span class=built_in>this</span> <span class=keyword>class</span></span><br><span class=line> <span class="title class_">provides</span> many adjustable parameters and extensibility</span><br><span class=line> hooks. However, programmers are urged to use the more convenient</span><br><span class=line> {<span class=meta>@link</span> Executors} factory methods {<span class=meta>@link</span></span><br><span class=line> Executors#newCachedThreadPool} (unbounded thread pool, with</span><br><span class=line> automatic thread reclamation), {<span class=meta>@link</span> Executors#newFixedThreadPool}</span><br><span class=line> (fixed size thread pool) and {<span class=meta>@link</span></span><br><span class=line> Executors#newSingleThreadExecutor} (single background thread), that</span><br><span class=line> preconfigure settings <span class=keyword>for</span> the most common usage</span><br><span class=line> scenarios. Otherwise, use the following guide when manually</span><br><span class=line> configuring and tuning <span class=built_in>this</span> class:</span><br><span class=line> <span class=comment>// 为了在各种情况下都能派上用场，该类提供了许多可调整的参数和扩展钩子。不过，我们建议程序员使用更方便的 Executors 工厂方法 Executors.</span></span><br><span class=line> <span class=comment>// newCachedThreadPool（无限制线程池，可自动回收线程）、Executors.newFixedThreadPool（固定大小线程池）和 Executors.</span></span><br><span class=line> <span class=comment>// newSingleThreadExecutor（单后台线程），这些方法可为最常见的使用场景预先配置设置。否则，在手动配置和调整该类时，请使用以下指南：</span></span><br><span class=line></span><br><span class=line> Core and maximum pool sizes</span><br><span class=line> <span class=comment>// 核心和最大线程池大小</span></span><br><span class=line> A ThreadPoolExecutor will automatically adjust the pool <span class="title function_">size</span> <span class=params>(see getPoolSize)</span> according to the bounds set by <span class="title function_">corePoolSize</span> <span class=params>(see getCorePoolSize)</span> and <span class="title function_">maximumPoolSize</span> <span class=params>(see getMaximumPoolSize)</span>. When a <span class=keyword>new</span> <span class="title class_">task</span> is submitted in method <span class="title function_">execute</span><span class=params>(Runnable)</span>, and fewer than corePoolSize threads are running, a <span class=keyword>new</span> <span class="title class_">thread</span> is created to handle the request, even <span class=keyword>if</span> other worker threads are idle. If there are more than corePoolSize but less than maximumPoolSize threads running, a <span class=keyword>new</span> <span class="title class_">thread</span> will be created only <span class=keyword>if</span> the queue is full. By setting corePoolSize and maximumPoolSize the same, you create a fixed-size thread pool. By setting maximumPoolSize to an essentially unbounded value such as Integer.MAX_VALUE, you allow the pool to accommodate an arbitrary number of concurrent tasks. Most typically, core and maximum pool sizes are set only upon construction, but they may also be changed dynamically using setCorePoolSize and setMaximumPoolSize.</span><br><span class=line> <span class=comment>// ThreadPoolExecutor 会根据 corePoolSize（参见 getCorePoolSize）和 maximumPoolSize（参见 getMaximumPoolSize）设置的界限自动调整池大小（参见 getPoolSize）。在方法 execute(Runnable) 中提交新任务时，如果运行的线程少于 corePoolSize，即使其他工作线程处于空闲状态，也会创建一个新线程来处理请求。如果运行的线程多于 corePoolSize 但少于 maximumPoolSize，则只有在队列已满时才会创建新线程。如果将 corePoolSize 和 maximumPoolSize 设置为相同，就可以创建一个固定大小的线程池。如果将 maximumPoolSize 设置为 Integer.MAX_VALUE 等基本无限制的值，就可以让池容纳任意数量的并发任务。通常，核心和最大线程池大小只在构建时设置，但也可以使用 setCorePoolSize 和 setMaximumPoolSize 动态更改。</span></span><br><span class=line></span><br><span class=line>On-demand construction</span><br><span class=line><span class=comment>// 按需构建</span></span><br><span class=line> By <span class=keyword>default</span>, even core threads are initially created and started only when <span class=keyword>new</span> <span class="title class_">tasks</span> arrive, but <span class=built_in>this</span> can be overridden dynamically using method prestartCoreThread or prestartAllCoreThreads. You probably want to prestart threads <span class=keyword>if</span> you construct the pool with a non-empty queue.</span><br><span class=line> <span class=comment>// 默认情况下，即使是核心线程也是只有当新任务到来时才会初始创建和启动，但这可以使用方法 prestartCoreThread 或 prestartAllCoreThreads 进行动态重载。如果使用非空队列构建线程池，则可能需要预启动线程。</span></span><br><span class=line>Creating <span class=keyword>new</span> <span class="title class_">threads</span></span><br><span class=line><span class=comment>// 创建新线程</span></span><br><span class=line> <span class=comment>/** New threads are created using a ThreadFactory. If not otherwise specified, a Executors.defaultThreadFactory is used, that creates threads to all be in the same ThreadGroup and with the same NORM_PRIORITY priority and non-daemon status. By supplying a different ThreadFactory, you can alter the thread's name, thread group, priority, daemon status, etc. If a ThreadFactory fails to create a thread when asked by returning null from newThread, the executor will continue, but might not be able to execute any tasks. Threads should possess the "modifyThread" RuntimePermission. If worker threads or other threads using the pool do not possess this permission, service may be degraded: configuration changes may not take effect in a timely manner, and a shutdown pool may remain in a state in which termination is possible but not completed. */</span></span><br><span class=line> <span class=comment>// 新线程是使用线程工厂（ThreadFactory）创建的。如果未另行指定，将使用 Executors.defaultThreadFactory 创建线程，创建的线程将全部位于同一线程组，并具有相同的 NORM_PRIORITY 优先级和非守护进程状态。通过提供不同的 ThreadFactory，可以更改线程的名称、线程组、优先级、守护进程状态等。如果线程工厂无法按要求创建线程，从 newThread 返回空值，执行器将继续运行，但可能无法执行任何任务。线程应拥有 "modifyThread "运行时权限。如果工作线程或使用池的其他线程不具备此权限，服务可能会降级：配置更改可能无法及时生效，关闭的池可能会一直处于可以终止但无法完成的状态。</span></span><br><span class=line>Keep-alive times</span><br><span class=line><span class=comment>// 保活时间</span></span><br><span class=line> If the pool currently has more than corePoolSize threads, excess threads will be terminated <span class=keyword>if</span> they have been idle <span class=keyword>for</span> more than the <span class="title function_">keepAliveTime</span> <span class=params>(see getKeepAliveTime(TimeUnit)</span>). This provides a means of reducing resource consumption when the pool is not being actively used. If the pool becomes more active later, <span class=keyword>new</span> <span class="title class_">threads</span> will be constructed. This parameter can also be changed dynamically using method <span class="title function_">setKeepAliveTime</span><span class=params>(<span class=type>long</span>, TimeUnit)</span>. Using a value of Long.MAX_VALUE TimeUnit.NANOSECONDS effectively disables idle threads from ever terminating prior to shut down. By <span class=keyword>default</span>, the keep-alive policy applies only when there are more than corePoolSize threads. But method <span class="title function_">allowCoreThreadTimeOut</span><span class=params>(<span class=type>boolean</span>)</span> can be used to apply <span class=built_in>this</span> time-out policy to core threads as well, so <span class=type>long</span> as the keepAliveTime value is non-zero.</span><br><span class=line> <span class=comment>// 如果当前池中的线程数超过 corePoolSize，多余的线程在闲置时间超过 keepAliveTime（请参阅 getKeepAliveTime(TimeUnit)）时将被终止。这提供了一种在线程池未被频繁使用时减少资源消耗的方法。如果以后池变得更加活跃，就会构建新线程。也可以使用方法 setKeepAliveTime(long, TimeUnit) 动态更改该参数。使用 Long.MAX_VALUE TimeUnit.NANOSECONDS 值可有效禁止闲置线程在关闭前终止。默认情况下，只有当线程数超过 corePoolSize 时，才会采用保持连接策略。但只要 keepAliveTime 值不为零，就可以使用方法 allowCoreThreadTimeOut(boolean) 将超时策略也应用到核心线程。</span></span><br><span class=line>Queuing</span><br><span class=line><span class=comment>// 队列</span></span><br><span class=line> Any BlockingQueue may be used to transfer and hold submitted tasks. The use of <span class=built_in>this</span> queue interacts with pool sizing:</span><br><span class=line> <span class=comment>// 任何阻塞队列（BlockingQueue）都可用于传输和保留已提交的任务。该队列的使用与线程池大小有关：</span></span><br><span class=line> If fewer than corePoolSize threads are running, the Executor always prefers adding a <span class=keyword>new</span> <span class="title class_">thread</span> rather than queuing.</span><br><span class=line> <span class=comment>// 如果运行的线程少于 corePoolSize，执行器总是倾向于添加新线程而不是队列。</span></span><br><span class=line> If corePoolSize or more threads are running, the Executor always prefers queuing a request rather than adding a <span class=keyword>new</span> <span class="title class_">thread</span>.</span><br><span class=line> <span class=comment>// 如果运行的线程数大于或等于 corePoolSize，执行器总是倾向于将请求排队，而不是添加新线程。</span></span><br><span class=line> If a request cannot be queued, a <span class=keyword>new</span> <span class="title class_">thread</span> is created unless <span class=built_in>this</span> would exceed maximumPoolSize, in which <span class=keyword>case</span>, the task will be rejected.</span><br><span class=line> <span class=comment>// 如果请求无法进队列，执行器会创建一个新线程，除非这样做会超过最大线程池大小（maximumPoolSize），在这种情况下，任务会被拒绝。</span></span><br><span class=line> There are three general strategies <span class=keyword>for</span> queuing:</span><br><span class=line> <span class=comment>// 入队一般有三种策略：</span></span><br><span class=line> Direct handoffs. A good <span class=keyword>default</span> choice <span class=keyword>for</span> a work queue is a SynchronousQueue that hands off tasks to threads without otherwise holding them. Here, an attempt to queue a task will fail <span class=keyword>if</span> no threads are immediately available to run it, so a <span class=keyword>new</span> <span class="title class_">thread</span> will be constructed. This policy avoids lockups when handling sets of requests that might have internal dependencies. Direct handoffs generally require unbounded maximumPoolSizes to avoid rejection of <span class=keyword>new</span> <span class="title class_">submitted</span> tasks. This in turn admits the possibility of unbounded thread growth when commands <span class=keyword>continue</span> to arrive on average faster than they can be processed.</span><br><span class=line> <span class=comment>// 直接交接。工作队列的一个很好的默认选择是同步队列（SynchronousQueue），它可以将任务移交给线程，而不会以其他方式保留任务。在这里，如果没有线程可立即运行任务，则队列任务的尝试将失败，因此会构建一个新的线程。在处理可能存在内部依赖关系的请求集时，这种策略可以避免死锁。直接交接通常需要无限制的最大线程池大小，以避免新提交的任务被拒绝。反过来，当命令的平均到达速度超过其处理速度时，就有可能导致线程无限制增长。</span></span><br><span class=line> <span class=comment>/** Unbounded queues. Using an unbounded queue (for example a LinkedBlockingQueue without a predefined capacity) will cause new tasks to wait in the queue when all corePoolSize threads are busy. Thus, no more than corePoolSize threads will ever be created. (And the value of the maximumPoolSize therefore doesn't have any effect.) This may be appropriate when each task is completely independent of others, so tasks cannot affect each others execution; for example, in a web page server. While this style of queuing can be useful in smoothing out transient bursts of requests, it admits the possibility of unbounded work queue growth when commands continue to arrive on average faster than they can be processed. */</span></span><br><span class=line> <span class=comment>// 无界队列。使用无界队列（例如没有预定义容量的 LinkedBlockingQueue）会导致新任务在所有 corePoolSize 线程都繁忙时在队列中等待。因此，创建的线程不会超过 corePoolSize。(当每个任务都完全独立于其他任务，因此任务之间不会相互影响执行时，例如在网页服务器中，这种方式可能比较合适。虽然这种队列方式在平滑瞬时突发请求方面很有用，但当命令的平均到达速度持续超过其处理速度时，就会导致工作队列无限制地增长。</span></span><br><span class=line> Bounded queues. A bounded <span class="title function_">queue</span> <span class=params>(<span class=keyword>for</span> example, an ArrayBlockingQueue)</span> helps prevent resource exhaustion when used with finite maximumPoolSizes, but can be more difficult to tune and control. Queue sizes and maximum pool sizes may be traded off <span class=keyword>for</span> each other: Using large queues and small pools minimizes CPU usage, OS resources, and context-switching overhead, but can lead to artificially low throughput. If tasks frequently <span class="title function_">block</span> <span class=params>(<span class=keyword>for</span> example <span class=keyword>if</span> they are I/O bound)</span>, a system may be able to schedule time <span class=keyword>for</span> more threads than you otherwise allow. Use of small queues generally <span class=keyword>requires</span> larger pool sizes, which keeps CPUs busier but may encounter unacceptable scheduling overhead, which also decreases throughput.</span><br><span class=line> <span class=comment>// 有界队列 有界队列（例如 ArrayBlockingQueue）与有限的最大线程池大小一起使用时，有助于防止资源耗尽，但可能更难调整和控制。队列大小和最大池大小可以相互权衡： 使用大队列和小池可以最大限度地减少 CPU 占用率、操作系统资源和上下文切换开销，但会导致人为的低吞吐量。如果任务经常出现阻塞（例如，如果任务受 I/O 约束），系统可能会为更多线程安排时间，而不考虑其他因素。使用小队列通常需要更大的池规模，这将使 CPU 更繁忙，但可能会遇到无法接受的调度开销，这也会降低吞吐量。</span></span><br><span class=line>Rejected tasks</span><br><span class=line><span class=comment>// 被拒绝的任务</span></span><br><span class=line> New tasks submitted in method <span class="title function_">execute</span><span class=params>(Runnable)</span> will be rejected when the Executor has been shut down, and also when the Executor uses finite bounds <span class=keyword>for</span> both maximum threads and work queue capacity, and is saturated. In either <span class=keyword>case</span>, the execute method invokes the RejectedExecutionHandler.rejectedExecution(Runnable, ThreadPoolExecutor) method of its RejectedExecutionHandler. Four predefined handler policies are provided:</span><br><span class=line> <span class=comment>// 如果执行器已关闭，或者执行器使用了最大线程数和工作队列容量的有限界限，并已达到饱和，那么在 execute(Runnable) 方法中提交的新任务将被拒绝。在这两种情况下，execute 方法都会调用其 RejectedExecutionHandler 的 RejectedExecutionHandler.rejectedExecution(Runnable, ThreadPoolExecutor) 方法。提供了四种预定义的处理程序策略：</span></span><br><span class=line> In the <span class=keyword>default</span> ThreadPoolExecutor.AbortPolicy, the handler <span class=keyword>throws</span> a runtime RejectedExecutionException upon rejection.</span><br><span class=line> <span class=comment>// 在默认的 ThreadPoolExecutor.AbortPolicy 中，处理程序会在拒绝时抛出运行时 RejectedExecutionException。</span></span><br><span class=line> In ThreadPoolExecutor.CallerRunsPolicy, the thread that invokes execute itself runs the task. This provides a simple feedback control mechanism that will slow down the rate that <span class=keyword>new</span> <span class="title class_">tasks</span> are submitted.</span><br><span class=line> <span class=comment>// 在 ThreadPoolExecutor.CallerRunsPolicy 中，调用执行本身的线程会运行任务。这提供了一个简单的反馈控制机制，可减慢提交新任务的速度。</span></span><br><span class=line> In ThreadPoolExecutor.DiscardPolicy, a task that cannot be executed is simply dropped.</span><br><span class=line> <span class=comment>// 在 ThreadPoolExecutor.DiscardPolicy 中，无法执行的任务会被直接丢弃。</span></span><br><span class=line> In ThreadPoolExecutor.DiscardOldestPolicy, <span class=keyword>if</span> the executor is not shut down, the task at the head of the work queue is dropped, and then execution is <span class="title function_">retried</span> <span class=params>(which can fail again, causing <span class=built_in>this</span> to be repeated.)</span></span><br><span class=line> <span class=comment>// 在 ThreadPoolExecutor.DiscardOldestPolicy 中，如果执行器没有关闭，工作队列头部的任务就会被丢弃，然后重新执行（可能会再次失败，导致重复执行）。</span></span><br><span class=line> It is possible to define and use other kinds of RejectedExecutionHandler classes. Doing so <span class=keyword>requires</span> some care especially when policies are designed to work only under particular capacity or queuing policies.</span><br><span class=line> <span class=comment>// 我们还可以定义和使用其他类型的 RejectedExecutionHandler 类。这样做需要小心谨慎，尤其是当策略设计为仅在特定容量或队列策略下运行时。</span></span><br><span class=line>Hook methods</span><br><span class=line><span class=comment>// 钩子方法</span></span><br><span class=line> This <span class=keyword>class</span> <span class="title class_">provides</span> <span class=keyword>protected</span> overridable <span class="title function_">beforeExecute</span><span class=params>(Thread, Runnable)</span> and <span class="title function_">afterExecute</span><span class=params>(Runnable, Throwable)</span> methods that are called before and after execution of each task. These can be used to manipulate the execution environment; <span class=keyword>for</span> example, reinitializing ThreadLocals, gathering statistics, or adding log entries. Additionally, method terminated can be overridden to perform any special processing that needs to be done once the Executor has fully terminated.</span><br><span class=line> <span class=comment>// 该类提供 protected 的可重载 beforeExecute(Thread, Runnable) 和 afterExecute(Runnable, Throwable) 方法，可在每个任务执行前后调用。这些方法可用于操纵执行环境，例如，重新初始化线程位置、收集统计数据或添加日志条目。此外，还可以重写终止方法，以便在执行器完全终止后执行任何需要进行的特殊处理。(一些动态线程池技术就用到了这两个方法)</span></span><br><span class=line> If hook or callback methods <span class=keyword>throw</span> exceptions, internal worker threads may in turn fail and abruptly terminate.</span><br><span class=line> <span class=comment>// 如果钩子或回调方法抛出异常，内部工作线程可能会失败并突然终止。</span></span><br><span class=line>Queue maintenance</span><br><span class=line><span class=comment>// 队列维护</span></span><br><span class=line> Method <span class="title function_">getQueue</span><span class=params>()</span> allows access to the work queue <span class=keyword>for</span> purposes of monitoring and debugging. Use of <span class=built_in>this</span> method <span class=keyword>for</span> any other purpose is strongly discouraged. Two supplied methods, remove(Runnable) and purge are available to assist in storage reclamation when large numbers of queued tasks become cancelled.</span><br><span class=line> <span class=comment>// 方法 getQueue() 允许访问工作队列，以便进行监控和调试。强烈建议不要将此方法用于任何其他目的。当大量队列任务被取消时，可使用 remove(Runnable) 和 purge 这两个提供的方法来帮助回收存储空间。(不建议直接将获取到的队列进行修改操作)</span></span><br><span class=line>Finalization</span><br><span class=line><span class=comment>// 终止</span></span><br><span class=line> A pool that is no longer referenced in a program AND has no remaining threads will be shutdown automatically. If you would like to ensure that unreferenced pools are reclaimed even <span class=keyword>if</span> users forget to call shutdown, then you must arrange that unused threads eventually die, by setting appropriate keep-alive times, using a lower bound of zero core threads and/or setting <span class="title function_">allowCoreThreadTimeOut</span><span class=params>(<span class=type>boolean</span>)</span>.</span><br><span class=line> <span class=comment>// 程序中不再引用且没有剩余线程的池将自动关闭。如果要确保即使用户忘记调用 shutdown 也能回收未引用的池，则必须通过设置适当的保持连接时间、使用零核心线程下限和/或设置 allowCoreThreadTimeOut(boolean) 来使得未使用的线程最终被停止。</span></span><br></pre></table></figure><p>通过前面的简单翻译我们就能大致略窥得线程池配置全貌，继续看一个构造方法<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class="title function_">ThreadPoolExecutor</span><span class=params>(<span class=type>int</span> corePoolSize,</span></span><br><span class=line><span class=params> <span class=type>int</span> maximumPoolSize,</span></span><br><span class=line><span class=params> <span class=type>long</span> keepAliveTime,</span></span><br><span class=line><span class=params> TimeUnit unit,</span></span><br><span class=line><span class=params> BlockingQueue<Runnable> workQueue)</span> {</span><br><span class=line> <span class=built_in>this</span>(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue,</span><br><span class=line> Executors.defaultThreadFactory(), defaultHandler);</span><br><span class=line>}</span><br><span class=line><span class=keyword>private</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>RejectedExecutionHandler</span> <span class=variable>defaultHandler</span> <span class=operator>=</span></span><br><span class=line> <span class=keyword>new</span> <span class="title class_">AbortPolicy</span>();</span><br></pre></table></figure><p>这个构造方法就主要配置了 <code>corePoolSize</code> 核心线程数，<code>maximumPoolSize</code> 最大线程数, <code>keepAliveTime</code> 线程保活时间，<code>unit</code> 时间单位，<code>workQueue</code> 工作队列，而传入后可以看到使用了默认的线程工厂和默认的拒绝处理器<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class="title function_">ThreadPoolExecutor</span><span class=params>(<span class=type>int</span> corePoolSize,</span></span><br><span class=line><span class=params> <span class=type>int</span> maximumPoolSize,</span></span><br><span class=line><span class=params> <span class=type>long</span> keepAliveTime,</span></span><br><span class=line><span class=params> TimeUnit unit,</span></span><br><span class=line><span class=params> BlockingQueue<Runnable> workQueue,</span></span><br><span class=line><span class=params> ThreadFactory threadFactory,</span></span><br><span class=line><span class=params> RejectedExecutionHandler handler)</span> {</span><br><span class=line> <span class=keyword>if</span> (corePoolSize < <span class=number>0</span> ||</span><br><span class=line> maximumPoolSize <= <span class=number>0</span> ||</span><br><span class=line> maximumPoolSize < corePoolSize ||</span><br><span class=line> keepAliveTime < <span class=number>0</span>)</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">IllegalArgumentException</span>();</span><br><span class=line> <span class=keyword>if</span> (workQueue == <span class=literal>null</span> || threadFactory == <span class=literal>null</span> || handler == <span class=literal>null</span>)</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">NullPointerException</span>();</span><br><span class=line> <span class=built_in>this</span>.acc = System.getSecurityManager() == <span class=literal>null</span> ?</span><br><span class=line> <span class=literal>null</span> :</span><br><span class=line> AccessController.getContext();</span><br><span class=line> <span class=built_in>this</span>.corePoolSize = corePoolSize;</span><br><span class=line> <span class=built_in>this</span>.maximumPoolSize = maximumPoolSize;</span><br><span class=line> <span class=built_in>this</span>.workQueue = workQueue;</span><br><span class=line> <span class=built_in>this</span>.keepAliveTime = unit.toNanos(keepAliveTime);</span><br><span class=line> <span class=built_in>this</span>.threadFactory = threadFactory;</span><br><span class=line> <span class=built_in>this</span>.handler = handler;</span><br><span class=line>}</span><br></pre></table></figure><p>最终会执行到这里做一些校验判断，包括几个参数校验和配置赋值</div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2024/02/04/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E5%87%86%E5%A4%87%E7%AF%87/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2024/02/04/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E5%87%86%E5%A4%87%E7%AF%87/ itemprop=url>Java 线程池系列-准备篇</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 itemprop="dateCreated datePublished" title="创建时间：2024-02-04 23:10:20" datetime=2024-02-04T23:10:20+08:00>2024-02-04</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><span class="post-meta-item leancloud_visitors" data-flag-title="Java 线程池系列-准备篇" id=/2024/02/04/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E5%87%86%E5%A4%87%E7%AF%87/ 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 href=/2024/02/04/Java-%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%B3%BB%E5%88%97-%E5%87%86%E5%A4%87%E7%AF%87/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2024/02/04/Java-线程池系列-准备篇/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>Java 线程池是 Java 并发体系里的重要组成部分，不过说起线程池一般都是几个参数，以及参数的含义和逻辑，为了更适合刚开始学习的同学或者说有一些会对这么个习惯性的概括讲法有点疑惑的，我们就从零开始，从最基础的开始看起，先来看下里面用来判断线程池状态和线程数量的部分<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br></pre><td class=code><pre><span class=line><span class=keyword>private</span> <span class=keyword>final</span> <span class=type>AtomicInteger</span> <span class=variable>ctl</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">AtomicInteger</span>(ctlOf(RUNNING, <span class=number>0</span>));</span><br><span class=line><span class=keyword>private</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>int</span> <span class=variable>COUNT_BITS</span> <span class=operator>=</span> Integer.SIZE - <span class=number>3</span>;</span><br><span class=line><span class=keyword>private</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>int</span> <span class=variable>CAPACITY</span> <span class=operator>=</span> (<span class=number>1</span> << COUNT_BITS) - <span class=number>1</span>;</span><br><span class=line></span><br><span class=line><span class=comment>// runState is stored in the high-order bits</span></span><br><span class=line><span class=keyword>private</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>int</span> <span class=variable>RUNNING</span> <span class=operator>=</span> -<span class=number>1</span> << COUNT_BITS;</span><br><span class=line><span class=keyword>private</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>int</span> <span class=variable>SHUTDOWN</span> <span class=operator>=</span> <span class=number>0</span> << COUNT_BITS;</span><br><span class=line><span class=keyword>private</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>int</span> <span class=variable>STOP</span> <span class=operator>=</span> <span class=number>1</span> << COUNT_BITS;</span><br><span class=line><span class=keyword>private</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>int</span> <span class=variable>TIDYING</span> <span class=operator>=</span> <span class=number>2</span> << COUNT_BITS;</span><br><span class=line><span class=keyword>private</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>int</span> <span class=variable>TERMINATED</span> <span class=operator>=</span> <span class=number>3</span> << COUNT_BITS;</span><br><span class=line></span><br><span class=line><span class=comment>// Packing and unpacking ctl</span></span><br><span class=line><span class=keyword>private</span> <span class=keyword>static</span> <span class=type>int</span> <span class="title function_">runStateOf</span><span class=params>(<span class=type>int</span> c)</span> { <span class=keyword>return</span> c & ~CAPACITY; }</span><br><span class=line><span class=keyword>private</span> <span class=keyword>static</span> <span class=type>int</span> <span class="title function_">workerCountOf</span><span class=params>(<span class=type>int</span> c)</span> { <span class=keyword>return</span> c & CAPACITY; }</span><br><span class=line><span class=keyword>private</span> <span class=keyword>static</span> <span class=type>int</span> <span class="title function_">ctlOf</span><span class=params>(<span class=type>int</span> rs, <span class=type>int</span> wc)</span> { <span class=keyword>return</span> rs | wc; }</span><br></pre></table></figure><p>这里我们先看下 <code>COUNT_BITS</code> 它是 <code>Integer.SIZE - 3</code>，<code>Integer.SIZE</code> 这个是 32，也就是代表了 Java 用了四个 <code>Byte</code> 来存一个 <code>Integer</code>, 那么 <code>COUNT_BITS</code> 就是 29，<br>这个 29 是用了干嘛的呢，逐步往下看，为什么先介绍 <code>COUNT_BITS</code>，因为第一行的 <code>ctl</code> 的值是通过 <code>ctlOf(RUNNING, 0)</code> 算出来的，而 <code>RUNNING</code> 又是通过等于 <code>-1</code> 左移 <code>COUNT_BITS</code> 位来得到，移动 29 位后，还剩下三位，而这三位只需要表示后面五种状态，其中只有 <code>RUNNING</code> 是负值，这样就巧妙的只利用了 ctl 的前三位来存储线程池的状态而后面的 29 位就是用来存储线程数量的，具体怎么取呢，我们在来看下 <code>CAPACITY</code> 它是 <code>(1 << COUNT_BITS) - 1</code> 把 1 左移 29 位后减 1，也就是 536870911，这里再补充下，左移一位就等于是乘以 2，左移 29 位就是乘以 2 的 29 次，减了 1 就是 29 位能存的最大值，代表线程池最大的线程容量，用二进制来表示就是 32 位长度的int，前三位是 0，后 29 位是 1，代表了线程池的容量，那么 <code>runStateOf</code> 和 <code>workerCountOf</code> 的理解就很简单了，<br><code>runStateOf</code> 是 c 跟 CAPACITY 取反之后的值做”与”操作，<code>CAPACITY</code> 取反就变成了前三位是 1，后面的二十九位是 0，而对于”与”操作，后面的二十九位无论是什么都会被忽略，也就是取了前三位的值<br><code>workerCountOf</code> 正好相反，直接跟 <code>CAPACITY</code> 做 “与” 操作，也就是取后二十九位的值<br><code>ctlOf</code> 就是直接对 <code>rs</code> 与 <code>wc</code> 做了 “或” 操作<br>而前面也提到了只有 <code>RUNNING</code> 是负数，那么就可以直接做大小比较来判断线程池状态<br>这个可能对很多同学来说是非常简单的，但是对于一部分同学来说就是个拦路虎，希望能对这部分同学有所帮助。</div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2024/01/28/Leetcode-572-Subtree-of-Another-Tree-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2024/01/28/Leetcode-572-Subtree-of-Another-Tree-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/ itemprop=url>Leetcode 572 Subtree of Another Tree 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 itemprop="dateCreated datePublished" title="创建时间：2024-01-28 21:17:42" datetime=2024-01-28T21:17:42+08:00>2024-01-28</time> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-calendar-check"></i> </span><span class=post-meta-item-text>更新于</span> <time title="修改时间：2025-10-12 20:06:06" datetime=2025-10-12T20:06:06+08:00 itemprop=dateModified>2025-10-12</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 class="post-meta-item leancloud_visitors" data-flag-title="Leetcode 572 Subtree of Another Tree 题解分析" id=/2024/01/28/Leetcode-572-Subtree-of-Another-Tree-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/ 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 href=/2024/01/28/Leetcode-572-Subtree-of-Another-Tree-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2024/01/28/Leetcode-572-Subtree-of-Another-Tree-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 class=headerlink href=#题目介绍 title=题目介绍></a>题目介绍</h2><p>Given the roots of two binary trees root and subRoot, return true if there is a subtree of root with the same structure and node values of subRoot and false otherwise.<p>A subtree of a binary tree tree is a tree that consists of a node in tree and all of this node’s descendants. The tree tree could also be considered as a subtree of itself.<h2 id=示例-1><a title="示例 1" class=headerlink href=#示例-1></a>示例 1</h2><p><img data-src=https://img.nicksxs.me/blog/3JTlNY.png><blockquote><p>Input: root = [3,4,5,1,2], subRoot = [4,1,2]<br>Output: true</blockquote><h2 id=示例-2><a title="示例 2" class=headerlink href=#示例-2></a>示例 2</h2><p><img data-src=https://img.nicksxs.me/blog/hnatjE.png><blockquote><p>Input: root = [3,4,5,1,2,null,null,null,null,0], subRoot = [4,1,2]<br>Output: false</blockquote><h2 id=解析><a class=headerlink href=#解析 title=解析></a>解析</h2><p>需要判断subRoot 为根节点的这棵树是不是 root 为根节点的这个树的子树，题应该不是特别难理解，只是需要注意，这里是子树，而不是一个子结构，也就是示例 2 的判断结果是 false，因为左边子树还有个 0，只能认为是左边的一部分，但不是子树，思路分析也不难，就是递归去判断，只不过是两种维度，第一种就是找到子树的根节点，也就是在 root 树找到 subRoot 的根节点相同的节点，这个就会用到递归，如果找到了一个，就开始递归的对比所有子节点，必须完全一样<h2 id=代码><a class=headerlink href=#代码 title=代码></a>代码</h2><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=type>boolean</span> <span class="title function_">isSubtree</span><span class=params>(TreeNode root, TreeNode subRoot)</span> {</span><br><span class=line> <span class=keyword>if</span> (subRoot == <span class=literal>null</span> || root == <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>return</span> <span class=literal>false</span>;</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (root.val == subRoot.val) {</span><br><span class=line> <span class=comment>// 如果 root 节点跟 subRoot 节点相同，就开始递归对比所有的子节点</span></span><br><span class=line> <span class=keyword>if</span> (isSameTree(root.left, subRoot.left) && isSameTree(root.right, subRoot.right)) {</span><br><span class=line> <span class=keyword>return</span> <span class=literal>true</span>;</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> <span class=comment>// 如果 root 节点不同，就开始递归往下找与 subRoot 相同的起始节点，这里是或的关系，因为在左右子树任一找到一个就行</span></span><br><span class=line> <span class=keyword>return</span> isSubtree(root.left, subRoot) || isSubtree(root.right, subRoot);</span><br><span class=line> }</span><br><span class=line> <span class=comment>// 需要完全相同，也就是说不能像示例 2 那样多一个子节点这种，以及其他不同的情况，反正就是要完全一样</span></span><br><span class=line> <span class=keyword>public</span> <span class=type>boolean</span> <span class="title function_">isSameTree</span><span class=params>(TreeNode root, TreeNode subTree)</span> {</span><br><span class=line> <span class=comment>// 如果递归到这个节点都为空也认为是相同的</span></span><br><span class=line> <span class=keyword>if</span> (root == <span class=literal>null</span> && subTree == <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>return</span> <span class=literal>true</span>;</span><br><span class=line> }</span><br><span class=line> <span class=comment>// 因为有前面的判断，这里就隐含了 subTree != null 这个条件</span></span><br><span class=line> <span class=keyword>if</span> (root == <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>return</span> <span class=literal>false</span>;</span><br><span class=line> }</span><br><span class=line> <span class=comment>// 也因为有前面的判断，这里就隐含了 root != null 这个条件</span></span><br><span class=line> <span class=keyword>if</span> (subTree == <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>return</span> <span class=literal>false</span>;</span><br><span class=line> }</span><br><span class=line> <span class=comment>// 两个都不为空，但是值不相同，也是 false</span></span><br><span class=line> <span class=keyword>if</span> (root.val != subTree.val) {</span><br><span class=line> <span class=keyword>return</span> <span class=literal>false</span>;</span><br><span class=line> }</span><br><span class=line> <span class=comment>// 跟节点相同，就开始递归判断左右子树，必须两者都相同</span></span><br><span class=line> <span class=keyword>return</span> isSameTree(root.left, subTree.left) && isSameTree(root.right, subTree.right);</span><br><span class=line> }</span><br></pre></table></figure></div><footer class=post-footer><div class=post-eof></div></footer></article></div><nav class=pagination><a class="extend prev" aria-label=上一页 href=/page/17/ rel=prev title=上一页><i class="fa fa-angle-left"></i></a><a class=page-number href=/>1</a><span class=space>…</span><a class=page-number href=/page/17/>17</a><span class="page-number current">18</span><a class=page-number href=/page/19/>19</a><span class=space>…</span><a class=page-number href=/page/68/>68</a><a class="extend next" aria-label=下一页 href=/page/19/ rel=next title=下一页><i class="fa fa-angle-right"></i></a></nav></div></main><footer class=footer><div class=footer-inner><div class=beian><a href=https://beian.miit.gov.cn/ rel=noopener target=_blank>浙ICP备16002580号-2 </a><img alt src=/uploads/beian.png><a href=https://beian.mps.gov.cn/#/query/webSearch?code=33010602011094 rel=noopener target=_blank>浙公网安备 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