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102 KiB
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Notes</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">open in new window</span></span><!--[--><!--]--></a><!----></li><li><a href="/en/doc/contact-us.md" class="sidebar-item" aria-label="Contact us"><!--[--><!--]--> Contact us <!--[--><!--]--></a><!----></li><!--]--></ul></li><!--]--></ul><!--[--><!--]--></aside><!--]--><!--[--><main class="page" data-v-fdd717e0><!--[--><!--]--><div class="right-menu-padding theme-default-content" data-v-fdd717e0><!--[--><!--]--><div class="right-menu-wrapper" data-v-fdd717e0 data-v-64666cd5><div class="right-menu-margin" data-v-64666cd5><div class="right-menu-title" data-v-64666cd5>Table of Contents</div><div class="right-menu-content" data-v-64666cd5><!--[--><!--]--></div></div></div><div data-v-fdd717e0><h1 id="quick-start" tabindex="-1"><a class="header-anchor" href="#quick-start" aria-hidden="true">#</a> Quick Start</h1><p>You can practice it yourself by following the instructions below, or you can use our <a href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=en&id=arthas-basics" target="_blank" rel="noopener noreferrer">online tutorials<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">open in new window</span></span></a> to get started quickly.</p><h2 id="_1-start-math-game" tabindex="-1"><a class="header-anchor" href="#_1-start-math-game" aria-hidden="true">#</a> 1. Start math-game</h2><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token function">curl</span> <span class="token parameter variable">-O</span> https://arthas.aliyun.com/math-game.jar
|
|
<span class="token function">java</span> <span class="token parameter variable">-jar</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></div><p><code>math-game</code> is a simple program that generates a random number every second, then it finds all prime factors of that number.</p><p>The source code of <code>math-game</code>: <a href="https://github.com/alibaba/arthas/blob/master/math-game/src/main/java/demo/MathGame.java" target="_blank" rel="noopener noreferrer">View<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">open in new window</span></span></a></p><h2 id="_2-start-arthas" tabindex="-1"><a class="header-anchor" href="#_2-start-arthas" aria-hidden="true">#</a> 2. Start Arthas</h2><h3 id="linux-unix-mac" tabindex="-1"><a class="header-anchor" href="#linux-unix-mac" aria-hidden="true">#</a> Linux/Unix/Mac</h3><p>Execute the following command in the command line:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token function">curl</span> <span class="token parameter variable">-O</span> https://arthas.aliyun.com/arthas-boot.jar
|
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<span class="token function">java</span> <span class="token parameter variable">-jar</span> arthas-boot.jar
|
|
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>The user to run this command <em>MUST</em> have the same privilege as the owner of the target process, as a simple example you can try the following command if the target process is managed by user <code>admin</code>: <code>sudo su admin && java -jar arthas-boot.jar</code> or <code>sudo -u admin -EH java -jar arthas-boot.jar</code></li><li>If you cannot be able to attach to the target process, please check the logs under <code>~/logs/arthas</code> for troubleshooting.</li><li><code>java -jar arthas-boot.jar -h</code> print usage.</li></ul><p>Select the target Java process to attach:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ $ <span class="token function">java</span> <span class="token parameter variable">-jar</span> 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>The <code>math-game</code> process is the second as shown above, press '2' then 'Enter'. Arthas will attach to the target process, and start to output:</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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|
|
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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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|
|
$
|
|
</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-check-the-dashboard" tabindex="-1"><a class="header-anchor" href="#_3-check-the-dashboard" aria-hidden="true">#</a> 3. Check the Dashboard</h2><p>Type '<a href="/en/doc/dashboard.html" class="">dashboard</a>' and hit 'ENTER', a brief report on the current process will be shown as below, pls. <code>Ctrl+C</code> to stop:</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
|
|
<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>
|
|
<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>
|
|
<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>
|
|
<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>
|
|
Memory used total max usage GC
|
|
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 <span class="token parameter variable">-1</span> 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
|
|
</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-get-the-main-class-of-the-math-game-process-with-the-thread-command" tabindex="-1"><a class="header-anchor" href="#_4-get-the-main-class-of-the-math-game-process-with-the-thread-command" aria-hidden="true">#</a> 4. Get the Main Class of the <code>math-game</code> process with the thread command</h2><p><code>thread 1</code> will print the stack of the thread with ID 1, which usually the main function thread.</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>
|
|
at demo.MathGame.main<span class="token punctuation">(</span>MathGame.java:17<span class="token punctuation">)</span>
|
|
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="_5-decompile-main-class-with-jad-command" tabindex="-1"><a class="header-anchor" href="#_5-decompile-main-class-with-jad-command" aria-hidden="true">#</a> 5. Decompile Main Class with jad command</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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|
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<span class="token comment">/*
|
|
* Decompiled with CFR 0_132.
|
|
*/</span>
|
|
<span class="token keyword">package</span> <span class="token namespace">demo</span><span class="token punctuation">;</span>
|
|
|
|
<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>
|
|
<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>
|
|
<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>
|
|
<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>
|
|
|
|
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">MathGame</span> <span class="token punctuation">{</span>
|
|
<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>
|
|
<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>
|
|
|
|
<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>
|
|
<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>
|
|
<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><span class="token constant">SECONDS</span><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>Use '<a href="/en/doc/watch.html" class="">watch</a>' to view the return object of <code>demo.MathGame#primeFactors</code>:</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>Pls. refer to <a href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=en&id=arthas-advanced" target="_blank" rel="noopener noreferrer">Arthas advanced<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">open in new window</span></span></a> for more information.</p><h2 id="_7-exit-arthas" tabindex="-1"><a class="header-anchor" href="#_7-exit-arthas" aria-hidden="true">#</a> 7. Exit Arthas</h2><p>Use <code>quit</code> or <code>exit</code> to disconnect from the current process. The Arthas instance attached to the target process continues to live inside the process, and its port is standby for further connection.</p><p>Use <code>stop</code> command to have Arthas completely quit from the target process.</p></div><!--[--><!--]--></div><footer class="page-meta right-menu-padding" data-v-fdd717e0><div class="meta-item edit-link"><a class="external-link meta-item-label" href="https://github.com/alibaba/arthas/edit/master/site/docs/en/doc/quick-start.md" rel="noopener noreferrer" target="_blank" aria-label="Edit this page on GitHub"><!--[--><!--]--><span>Edit this page on GitHub</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">open in new window</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">Contributors: </span><span class="meta-item-info"><!--[--><!--[--><span class="contributor" title="email: hengyunabc@gmail.com">hengyunabc</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: LHearen@126.com">Hearen</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: i@fatpandac.com">Fatpandac</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: 26602940+0xflotus@users.noreply.github.com">0xflotus</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: arteevraina@gmail.com">Arteev Raina</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: lhearen@gmail.com">LHearen</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: ian.luo@gmail.com">beiwei30</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: 1412950785@qq.com">garenchan</span><!----><!--]--><!--]--></span></div></footer><nav class="page-nav right-menu-padding" data-v-fdd717e0><p class="inner"><span class="prev"><a href="/en/doc/" class="router-link-active" aria-label="Introduction"><!--[--><!--]--> Introduction <!--[--><!--]--></a></span><span class="next"><a href="/en/doc/install-detail.html" class="" aria-label="Install Arthas"><!--[--><!--]--> Install Arthas <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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<script type="module" src="/assets/app.e05b0501.js" defer></script>
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