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ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token function">curl</span> -O https://arthas.aliyun.com/math-game.jar
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java -jar math-game.jar
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><p><code>math-game</code>是一个简单的程序，每隔一秒生成一个随机数，再执行质因数分解，并打印出分解结果。</p><p><code>math-game</code>源代码：<a href="https://github.com/alibaba/arthas/blob/master/math-game/src/main/java/demo/MathGame.java" target="_blank" rel="noopener noreferrer">查看<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a></p><h2 id="_2-启动-arthas" tabindex="-1"><a class="header-anchor" href="#_2-启动-arthas" aria-hidden="true">#</a> 2. 启动 arthas</h2><p>在命令行下面执行（使用和目标进程一致的用户启动，否则可能 attach 失败）：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token function">curl</span> -O https://arthas.aliyun.com/arthas-boot.jar
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java -jar arthas-boot.jar
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>执行该程序的用户需要和目标进程具有相同的权限。比如以<code>admin</code>用户来执行：<code>sudo su admin && java -jar arthas-boot.jar</code> 或 <code>sudo -u admin -EH java -jar arthas-boot.jar</code>。</li><li>如果 attach 不上目标进程，可以查看<code>~/logs/arthas/</code> 目录下的日志。</li><li>如果下载速度比较慢，可以使用 aliyun 的镜像：<code>java -jar arthas-boot.jar --repo-mirror aliyun --use-http</code></li><li><code>java -jar arthas-boot.jar -h</code> 打印更多参数信息。</li></ul><p>选择应用 java 进程：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ $ java -jar arthas-boot.jar
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* <span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span>: <span class="token number">35542</span>
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<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span>: <span class="token number">71560</span> math-game.jar
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><code>math-game</code>进程是第 2 个，则输入 2，再输入<code>回车/enter</code>。Arthas 会 attach 到目标进程上，并输出日志：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token punctuation">[</span>INFO<span class="token punctuation">]</span> Try to attach process <span class="token number">71560</span>
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<span class="token punctuation">[</span>INFO<span class="token punctuation">]</span> Attach process <span class="token number">71560</span> success.
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<span class="token punctuation">[</span>INFO<span class="token punctuation">]</span> arthas-client connect <span class="token number">127.0</span>.0.1 <span class="token number">3658</span>
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,---. ,------. ,--------.,--. ,--. ,---. ,---.
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/ O <span class="token punctuation">\</span> <span class="token operator">|</span> .--. <span class="token string">''</span>--. .--<span class="token string">'| '</span>--<span class="token string">' | / O \ '</span> .-<span class="token string">'
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| .-. || '</span>--<span class="token string">'.'</span> <span class="token operator">|</span> <span class="token operator">|</span> <span class="token operator">|</span> .--. <span class="token operator">||</span> .-. <span class="token operator">|</span><span class="token variable"><span class="token variable">`</span><span class="token builtin class-name">.</span> <span class="token variable">`</span></span>-.
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<span class="token operator">|</span> <span class="token operator">|</span> <span class="token operator">|</span> <span class="token operator">||</span> <span class="token operator">|</span><span class="token punctuation">\</span> <span class="token punctuation">\</span> <span class="token operator">|</span> <span class="token operator">|</span> <span class="token operator">|</span> <span class="token operator">|</span> <span class="token operator">|</span> <span class="token operator">||</span> <span class="token operator">|</span> <span class="token operator">|</span> <span class="token operator">|</span>.-<span class="token string">' |
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`--'</span> <span class="token variable"><span class="token variable">`</span>--'<span class="token variable">`</span></span>--<span class="token string">' '</span>--<span class="token string">' `--'</span> <span class="token variable"><span class="token variable">`</span>--' <span class="token variable">`</span></span>--<span class="token string">'`--'</span> <span class="token variable"><span class="token variable">`</span>--'<span class="token variable">`</span></span>-----'
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wiki: https://arthas.aliyun.com/doc
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version: <span class="token number">3.0</span>.5.20181127201536
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pid: <span class="token number">71560</span>
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time: <span class="token number">2018</span>-11-28 <span class="token number">19</span>:16:24
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$
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="_3-查看-dashboard" tabindex="-1"><a class="header-anchor" href="#_3-查看-dashboard" aria-hidden="true">#</a> 3. 查看 dashboard</h2><p>输入<a href="/doc/dashboard.html" class="">dashboard</a>，按<code>回车/enter</code>，会展示当前进程的信息，按<code>ctrl+c</code>可以中断执行。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ dashboard
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ID NAME GROUP PRIORI STATE %CPU TIME INTERRU DAEMON
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<span class="token number">17</span> pool-2-thread-1 system <span class="token number">5</span> WAITIN <span class="token number">67</span> <span class="token number">0</span>:0 <span class="token boolean">false</span> <span class="token boolean">false</span>
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<span class="token number">27</span> Timer-for-arthas-dashb system <span class="token number">10</span> RUNNAB <span class="token number">32</span> <span class="token number">0</span>:0 <span class="token boolean">false</span> <span class="token boolean">true</span>
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<span class="token number">11</span> AsyncAppender-Worker-a system <span class="token number">9</span> WAITIN <span class="token number">0</span> <span class="token number">0</span>:0 <span class="token boolean">false</span> <span class="token boolean">true</span>
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<span class="token number">9</span> Attach Listener system <span class="token number">9</span> RUNNAB <span class="token number">0</span> <span class="token number">0</span>:0 <span class="token boolean">false</span> <span class="token boolean">true</span>
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<span class="token number">3</span> Finalizer system <span class="token number">8</span> WAITIN <span class="token number">0</span> <span class="token number">0</span>:0 <span class="token boolean">false</span> <span class="token boolean">true</span>
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<span class="token number">2</span> Reference Handler system <span class="token number">10</span> WAITIN <span class="token number">0</span> <span class="token number">0</span>:0 <span class="token boolean">false</span> <span class="token boolean">true</span>
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<span class="token number">4</span> Signal Dispatcher system <span class="token number">9</span> RUNNAB <span class="token number">0</span> <span class="token number">0</span>:0 <span class="token boolean">false</span> <span class="token boolean">true</span>
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<span class="token number">26</span> as-command-execute-dae system <span class="token number">10</span> TIMED_ <span class="token number">0</span> <span class="token number">0</span>:0 <span class="token boolean">false</span> <span class="token boolean">true</span>
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<span class="token number">13</span> job-timeout system <span class="token number">9</span> TIMED_ <span class="token number">0</span> <span class="token number">0</span>:0 <span class="token boolean">false</span> <span class="token boolean">true</span>
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<span class="token number">1</span> main main <span class="token number">5</span> TIMED_ <span class="token number">0</span> <span class="token number">0</span>:0 <span class="token boolean">false</span> <span class="token boolean">false</span>
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<span class="token number">14</span> nioEventLoopGroup-2-1 system <span class="token number">10</span> RUNNAB <span class="token number">0</span> <span class="token number">0</span>:0 <span class="token boolean">false</span> <span class="token boolean">false</span>
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<span class="token number">18</span> nioEventLoopGroup-2-2 system <span class="token number">10</span> RUNNAB <span class="token number">0</span> <span class="token number">0</span>:0 <span class="token boolean">false</span> <span class="token boolean">false</span>
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<span class="token number">23</span> nioEventLoopGroup-2-3 system <span class="token number">10</span> RUNNAB <span class="token number">0</span> <span class="token number">0</span>:0 <span class="token boolean">false</span> <span class="token boolean">false</span>
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<span class="token number">15</span> nioEventLoopGroup-3-1 system <span class="token number">10</span> RUNNAB <span class="token number">0</span> <span class="token number">0</span>:0 <span class="token boolean">false</span> <span class="token boolean">false</span>
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Memory used total max usage GC
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heap 32M 155M 1820M <span class="token number">1.77</span>% gc.ps_scavenge.count <span class="token number">4</span>
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ps_eden_space 14M 65M 672M <span class="token number">2.21</span>% gc.ps_scavenge.time<span class="token punctuation">(</span>m <span class="token number">166</span>
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ps_survivor_space 4M 5M 5M s<span class="token punctuation">)</span>
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ps_old_gen 12M 85M 1365M <span class="token number">0.91</span>% gc.ps_marksweep.count <span class="token number">0</span>
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nonheap 20M 23M -1 gc.ps_marksweep.time<span class="token punctuation">(</span> <span class="token number">0</span>
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code_cache 3M 5M 240M <span class="token number">1.32</span>% ms<span class="token punctuation">)</span>
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Runtime
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os.name Mac OS X
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os.version <span class="token number">10.13</span>.4
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java.version <span class="token number">1.8</span>.0_162
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java.home /Library/Java/JavaVir
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tualMachines/jdk1.8.0
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_162.jdk/Contents/Hom
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e/jre
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="_4-通过-thread-命令来获取到math-game进程的-main-class" tabindex="-1"><a class="header-anchor" href="#_4-通过-thread-命令来获取到math-game进程的-main-class" aria-hidden="true">#</a> 4. 通过 thread 命令来获取到<code>math-game</code>进程的 Main Class</h2><p><code>thread 1</code>会打印线程 ID 1 的栈，通常是 main 函数的线程。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ thread <span class="token number">1</span> <span class="token operator">|</span> <span class="token function">grep</span> <span class="token string">'main('</span>
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at demo.MathGame.main<span class="token punctuation">(</span>MathGame.java:17<span class="token punctuation">)</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="_5-通过-jad-来反编译-main-class" tabindex="-1"><a class="header-anchor" href="#_5-通过-jad-来反编译-main-class" aria-hidden="true">#</a> 5. 通过 jad 来反编译 Main Class</h2><div class="language-java ext-java line-numbers-mode"><pre class="language-java"><code>$ jad <span class="token class-name"><span class="token namespace">demo<span class="token punctuation">.</span></span>MathGame</span>
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<span class="token class-name">ClassLoader</span><span class="token operator">:</span>
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<span class="token operator">+</span><span class="token operator">-</span><span class="token class-name"><span class="token namespace">sun<span class="token punctuation">.</span>misc<span class="token punctuation">.</span></span>Launcher</span>$<span class="token class-name">AppClassLoader</span><span class="token annotation punctuation">@3d4eac69</span>
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<span class="token operator">+</span><span class="token operator">-</span><span class="token class-name"><span class="token namespace">sun<span class="token punctuation">.</span>misc<span class="token punctuation">.</span></span>Launcher</span>$<span class="token class-name">ExtClassLoader</span><span class="token annotation punctuation">@66350f69</span>
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<span class="token class-name">Location</span><span class="token operator">:</span>
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<span class="token operator">/</span>tmp<span class="token operator">/</span>math<span class="token operator">-</span>game<span class="token punctuation">.</span>jar
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<span class="token comment">/*
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* Decompiled with CFR 0_132.
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*/</span>
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<span class="token keyword">package</span> <span class="token namespace">demo</span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">PrintStream</span></span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span><span class="token class-name">ArrayList</span></span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span><span class="token class-name">Iterator</span></span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span><span class="token class-name">List</span></span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span><span class="token class-name">Random</span></span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span></span><span class="token class-name">TimeUnit</span></span><span class="token punctuation">;</span>
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<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">MathGame</span> <span class="token punctuation">{</span>
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<span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token class-name">Random</span> random <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Random</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">int</span> illegalArgumentCount <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
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<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
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<span class="token class-name">MathGame</span> game <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MathGame</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">do</span> <span class="token punctuation">{</span>
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game<span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">TimeUnit</span><span class="token punctuation">.</span>SECONDS<span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">1L</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token keyword">int</span> number <span class="token operator">=</span> random<span class="token punctuation">.</span><span class="token function">nextInt</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Integer</span><span class="token punctuation">></span></span> primeFactors <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">primeFactors</span><span class="token punctuation">(</span>number<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">MathGame</span><span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span>number<span class="token punctuation">,</span> primeFactors<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">.</span><span class="token function">format</span><span class="token punctuation">(</span><span class="token string">"illegalArgumentCount:%3d, "</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>illegalArgumentCount<span class="token punctuation">)</span> <span class="token operator">+</span> e<span class="token punctuation">.</span><span class="token function">getMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">print</span><span class="token punctuation">(</span><span class="token keyword">int</span> number<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Integer</span><span class="token punctuation">></span></span> primeFactors<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">StringBuffer</span> sb <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StringBuffer</span><span class="token punctuation">(</span><span class="token string">""</span> <span class="token operator">+</span> number <span class="token operator">+</span> <span class="token string">"="</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">Iterator</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Integer</span><span class="token punctuation">></span></span> iterator <span class="token operator">=</span> primeFactors<span class="token punctuation">.</span><span class="token function">iterator</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">while</span> <span class="token punctuation">(</span>iterator<span class="token punctuation">.</span><span class="token function">hasNext</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">int</span> factor <span class="token operator">=</span> iterator<span class="token punctuation">.</span><span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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sb<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>factor<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token char">'*'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>sb<span class="token punctuation">.</span><span class="token function">charAt</span><span class="token punctuation">(</span>sb<span class="token punctuation">.</span><span class="token function">length</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token char">'*'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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sb<span class="token punctuation">.</span><span class="token function">deleteCharAt</span><span class="token punctuation">(</span>sb<span class="token punctuation">.</span><span class="token function">length</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>sb<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">public</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Integer</span><span class="token punctuation">></span></span> <span class="token function">primeFactors</span><span class="token punctuation">(</span><span class="token keyword">int</span> number<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>number <span class="token operator"><</span> <span class="token number">2</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token operator">++</span><span class="token keyword">this</span><span class="token punctuation">.</span>illegalArgumentCount<span class="token punctuation">;</span>
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<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalArgumentException</span><span class="token punctuation">(</span><span class="token string">"number is: "</span> <span class="token operator">+</span> number <span class="token operator">+</span> <span class="token string">", need >= 2"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Integer</span><span class="token punctuation">></span></span> result <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Integer</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">2</span><span class="token punctuation">;</span>
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<span class="token keyword">while</span> <span class="token punctuation">(</span>i <span class="token operator"><=</span> number<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>number <span class="token operator">%</span> i <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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result<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span><span class="token punctuation">;</span>
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number <span class="token operator">/=</span> i<span class="token punctuation">;</span>
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i <span class="token operator">=</span> <span class="token number">2</span><span class="token punctuation">;</span>
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<span class="token keyword">continue</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token operator">++</span>i<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">return</span> result<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token class-name">Affect</span><span class="token punctuation">(</span>row<span class="token operator">-</span>cnt<span class="token operator">:</span><span class="token number">1</span><span class="token punctuation">)</span> cost in <span class="token number">970</span> ms<span class="token punctuation">.</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="_6-watch" tabindex="-1"><a class="header-anchor" href="#_6-watch" aria-hidden="true">#</a> 6. watch</h2><p>通过<a href="/doc/watch.html" class="">watch</a>命令来查看<code>demo.MathGame#primeFactors</code>函数的返回值：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">watch</span> demo.MathGame primeFactors returnObj
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Press Ctrl+C to abort.
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Affect<span class="token punctuation">(</span>class-cnt:1 , method-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">107</span> ms.
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-11-28 <span class="token number">19</span>:22:30<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">1</span>.715367ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>null
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-11-28 <span class="token number">19</span>:22:31<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">0</span>.185203ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>null
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-11-28 <span class="token number">19</span>:22:32<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">19</span>.012416ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span><span class="token number">5</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">47</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">2675531</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-11-28 <span class="token number">19</span>:22:33<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">0</span>.311395ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">5</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">317</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">503</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">887</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-11-28 <span class="token number">19</span>:22:34<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">10</span>.136007ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">3</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">3</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">31</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">717593</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2018</span>-11-28 <span class="token number">19</span>:22:35<span class="token punctuation">;</span> <span class="token punctuation">[</span>cost<span class="token operator">=</span><span class="token number">29</span>.969732ms<span class="token punctuation">]</span> <span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
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@Integer<span class="token punctuation">[</span><span class="token number">5</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">29</span><span class="token punctuation">]</span>,
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@Integer<span class="token punctuation">[</span><span class="token number">7651739</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>更多的功能可以查看<a href="/doc/advanced-use.html" class="">进阶使用</a>。</p><h2 id="_7-退出-arthas" tabindex="-1"><a class="header-anchor" href="#_7-退出-arthas" aria-hidden="true">#</a> 7. 退出 arthas</h2><p>如果只是退出当前的连接，可以用<code>quit</code>或者<code>exit</code>命令。Attach 到目标进程上的 arthas 还会继续运行，端口会保持开放，下次连接时可以直接连接上。</p><p>如果想完全退出 arthas，可以执行<code>stop</code>命令。</p></div><!--[--><!--]--></div><footer class="page-meta right-menu-padding" data-v-e0e60120><div class="meta-item edit-link"><a class="external-link meta-item-label" href="https://github.com/alibaba/arthas/edit/master/site/docs/doc/quick-start.md" rel="noopener noreferrer" target="_blank" aria-label="在 GitHub 上编辑此页"><!--[--><!--]--><span>在 GitHub 上编辑此页</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a></div><div class="meta-item last-updated"><span class="meta-item-label">Last Updated: </span><!----></div><div class="meta-item contributors"><span class="meta-item-label">贡献者: </span><span class="meta-item-info"><!--[--><!--[--><span class="contributor" title="email: hengyunabc@gmail.com">hengyunabc</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: geneq@hotmail.com">Gene</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: sergioescala@gmail.com">Sergio Escalante</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: northmorn@gmail.com">northmorn</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: 260893248@qq.com">靳阳</span><!----><!--]--><!--]--></span></div></footer><nav class="page-nav right-menu-padding" data-v-e0e60120><p class="inner"><span class="prev"><a href="/doc/" class="router-link-active" aria-label="简介"><!--[--><!--]--> 简介 <!--[--><!--]--></a></span><span class="next"><a class="external-link" href="https://start.aliyun.com/handson-lab?category=arthas" rel="noopener noreferrer" target="_blank" aria-label="在线教程(阿里云)"><!--[--><!--]--><span>在线教程(阿里云)</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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