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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="renderer" content="webkit">
<meta http-equiv="X-UA-Compatible" content="IE=edge" >
<link rel="dns-prefetch" href="http://yoursite.com">
<title>Hexo</title>
<meta name="generator" content="hexo-theme-yilia-plus">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<!-- <meta name="keywords" content="">
<meta name="description" content=""> -->
<meta property="og:type" content="website">
<meta property="og:title" content="Hexo">
<meta property="og:url" content="http://yoursite.com/index.html">
<meta property="og:site_name" content="Hexo">
<meta property="og:locale" content="en_US">
<meta property="article:author" content="Yang Guomin">
<meta name="twitter:card" content="summary">
<link rel="alternative" href="/atom.xml" title="Hexo" type="application/atom+xml">
<link rel="icon" href="/favicon.ico">
<link rel="apple-touch-icon" href="/apple-touch-icon-180x180.png">
<link rel="stylesheet" type="text/css" href="/./main.a5fda8.css">
<style type="text/css">
#container.show {
background: linear-gradient(200deg,#a0cfe4,#e8c37e);
}
</style>
<script src="/lib/clickLove.js"></script>
</head>
<body>
<div id="container" q-class="show:isCtnShow">
<canvas id="anm-canvas" class="anm-canvas"></canvas>
<div class="left-col" q-class="show:isShow">
<div class="overlay" style="background: #4d4d4d;background: url('/img/biubiubiu.gif') no-repeat ;"></div>
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<header id="header" class="inner">
<a href="/" class="profilepic">
<img src="/img/tx.jpg" class="js-avatar">
</a>
<hgroup>
<h1 class="header-author"><a href="/">Yang Guomin</a></h1>
</hgroup>
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<ul>
<li><a href="/" target="_blank">主页</a></li>
<li><a href="https://www.zcool.com.cn/u/1512243" target="_blank">站酷主页</a></li>
<li><a href="http://www.kchuhai.com/talent/view-51883.html" target="_blank">快出海主页</a></li>
<li><a href="https://i.ui.cn/ucenter/349597.html" target="_blank">UI中国</a></li>
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<nav class="header-smart-menu">
<a q-on="click: openSlider(e, 'innerArchive')" href="javascript:void(0)">所有文章</a>
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<a q-on="click: openSlider(e, 'aboutme')" href="javascript:void(0)">关于我</a>
</nav>
<nav class="header-nav">
<div class="social">
<a class="github" href="https://github.com/Dxiaoer/" title="GitHub" target="_blank"><i class="icon-github"></i></a>
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<a class="cnblog" href="#" title="cnblog" target="_blank"><i class="icon-cnblog"></i></a>
<a class="weixin" href="/img/wxcode.jpg" title="wechat" target="_blank"><i class="icon-weixin"></i></a>
</div>
<div>
<iframe frameborder="no" border="0" marginwidth="0" marginheight="0" width="240" height="86" src="//music.163.com/outchain/player?type=2&id=1334445174&auto=1&height=66"></iframe>
</div>
<p style="font-size: 12px;">这似乎是首纯音乐，请尽情的欣赏它吧！<p>
</nav>
</header>
</div>
</div>
<div class="mid-col" q-class="show:isShow,hide:isShow|isFalse">
<a class="forkMe" style="position:absolute;z-index:999;top:0;right:0.5em;"
href="https://github.com/JoeyBling/hexo-theme-yilia-plus" target="_blank">
<img src="/img/forkme.png"
class="attachment-full size-full" alt="Fork me on GitHub" data-recalc-dims="1"></a>
<nav id="mobile-nav">
<div class="overlay js-overlay" style="background: #4d4d4d"></div>
<div class="btnctn js-mobile-btnctn">
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</div>
<div class="intrude-less">
<header id="header" class="inner">
<div class="profilepic">
<a href="/">
<img src="/img/tx.jpg" class="js-avatar">
</a>
</div>
<hgroup>
<h1 class="header-author js-header-author">Yang Guomin</h1>
</hgroup>
<nav class="header-nav">
<div class="social">
<a class="github" target="_blank" href="https://github.com/Dxiaoer/" title="GitHub"><i class="icon-github"></i></a>
<a class="jianshu" target="_blank" href="#" title="jianshu"><i class="icon-jianshu"></i></a>
<a class="cnblog" target="_blank" href="#" title="cnblog"><i class="icon-cnblog"></i></a>
<a class="weixin" target="_blank" href="/img/wxcode.jpg" title="wechat"><i class="icon-weixin"></i></a>
</div>
</nav>
<nav class="header-menu js-header-menu">
<ul style="width: 70%">
<li style="width: 25%"><a href="/">主页</a></li>
<li style="width: 25%"><a href="https://www.zcool.com.cn/u/1512243" target="_blank" rel="noopener">站酷主页</a></li>
<li style="width: 25%"><a href="http://www.kchuhai.com/talent/view-51883.html" target="_blank" rel="noopener">快出海主页</a></li>
<li style="width: 25%"><a href="https://i.ui.cn/ucenter/349597.html" target="_blank" rel="noopener">UI中国</a></li>
</ul>
</nav>
</header>
</div>
<div class="mobile-mask" style="display:none" q-show="isShow"></div>
</nav>
<div id="wrapper" class="body-wrap">
<div class="menu-l">
<div class="canvas-wrap">
<canvas data-colors="#eaeaea" data-sectionHeight="100" data-contentId="js-content" id="myCanvas1"
class="anm-canvas"></canvas>
</div>
<div id="js-content" class="content-ll">
<article id="post-hello-world" class="article article-type-post article-index" itemscope itemprop="blogPost">
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2020/07/08/hello-world/" target="_blank">Hello World</a>
</h1>
<a href="/2020/07/08/hello-world/" class="archive-article-date">
<time datetime="2020-07-08T13:04:46.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2020-07-08</time>
</a>
</header>
<div class="article-entry" itemprop="articleBody">
<p>Welcome to <a href="https://hexo.io/" target="_blank" rel="noopener">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="noopener">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html" target="_blank" rel="noopener">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="noopener">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo new <span class="string">"My New Post"</span></span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/writing.html" target="_blank" rel="noopener">Writing</a></p>
<h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo server</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/server.html" target="_blank" rel="noopener">Server</a></p>
<h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo generate</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/generating.html" target="_blank" rel="noopener">Generating</a></p>
<h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerlink" title="Deploy to remote sites"></a>Deploy to remote sites</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo deploy</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/one-command-deployment.html" target="_blank" rel="noopener">Deployment</a></p>
</div>
<div class="article-info article-info-index">
<p class="article-more-link">
<a class="article-more-a" href="/2020/07/08/hello-world/">展开全文 >></a>
</p>
<div class="clearfix"></div>
</div>
</div>
</article>
<aside class="wrap-side-operation">
<div class="mod-side-operation">
<div class="jump-container" id="js-jump-container" style="display:none;">
<a href="javascript:void(0)" class="mod-side-operation__jump-to-top">
<i class="icon-font icon-back"></i>
</a>
<div id="js-jump-plan-container" class="jump-plan-container" style="top: -11px;">
<i class="icon-font icon-plane jump-plane"></i>
</div>
</div>
</div>
</aside>
<article id="post-HashMap源码" class="article article-type-post article-index" itemscope itemprop="blogPost">
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2020/04/27/HashMap%E6%BA%90%E7%A0%81/" target="_blank">HashMap源码</a>
</h1>
<a href="/2020/04/27/HashMap%E6%BA%90%E7%A0%81/" class="archive-article-date">
<time datetime="2020-04-27T12:22:35.212Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2020-04-27</time>
</a>
</header>
<div class="article-entry" itemprop="articleBody">
<h2 id="HashMap的数据结构？"><a href="#HashMap的数据结构？" class="headerlink" title="HashMap的数据结构？"></a>HashMap的数据结构？</h2><p>Jdk1.7是数组加链表，而jdk1.8是数组加链表加红黑树</p>
<h2 id="HashMap的参数解释？"><a href="#HashMap的参数解释？" class="headerlink" title="HashMap的参数解释？"></a>HashMap的参数解释？</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//默认的初始容量16，必须是2的幂</span></span><br><span class="line"><span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> DEFAULT_INITIAL_CAPACITY = <span class="number">1</span> << <span class="number">4</span>; </span><br><span class="line"></span><br><span class="line"><span class="comment">//最大容量,如果较高的值由具有参数的任何构造函数隐式指定,则使用此容量。必须是二的幂<= 1 << 30。</span></span><br><span class="line"><span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> MAXIMUM_CAPACITY = <span class="number">1</span> << <span class="number">30</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">//在构造函数中未指定时使用的负载系数。</span></span><br><span class="line"><span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">float</span> DEFAULT_LOAD_FACTOR = <span class="number">0.75f</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">//链表转红黑树的阈值（链表转红黑树的条件有两个：1、binCount >= TREEIFY_THRESHOLD - 1 因为binCount是从0开始计算，所以阈值还是8；2、链表数 >= MIN_TREEIFY_CAPACITY）</span></span><br><span class="line"><span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> TREEIFY_THRESHOLD = <span class="number">8</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">//当红黑树节点数小于等于UNTREEIFY_THRESHOLD时红黑树转链表</span></span><br><span class="line"><span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> UNTREEIFY_THRESHOLD = <span class="number">6</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 这个字段决定了当hash表的至少大小为多少时，链表才能进行树化。这个设计时合理的，因为当hash表的大小很小时，这时候表所需的空间还不多，可以牺牲空间减少时间，所以这个情况下当存储的节点过多时，最好的办法是调整表的大小，使其增大，而不是将链表树化。</span></span><br><span class="line"><span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> MIN_TREEIFY_CAPACITY = <span class="number">64</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">//HashMap的大小</span></span><br><span class="line"> <span class="keyword">transient</span> <span class="keyword">int</span> size;</span><br><span class="line"></span><br><span class="line"><span class="comment">//被修改次数，内部结构发生变化指的是结构发生变化，例如put()方法（同样也包括resize()方法），用于快速失败（if (modCount != expectedModCount)throw new ConcurrentModificationException();）</span></span><br><span class="line"> <span class="keyword">transient</span> <span class="keyword">int</span> modCount;</span><br><span class="line"></span><br><span class="line"><span class="comment">//下次扩容阀值(容量*负载系数)</span></span><br><span class="line"> <span class="keyword">int</span> threshold;</span><br><span class="line"></span><br><span class="line"><span class="comment">//哈希表的负载系数</span></span><br><span class="line"><span class="keyword">final</span> <span class="keyword">float</span> loadFactor;</span><br></pre></td></tr></table></figure>
<h2 id="HashMap的重要方法put方法和resize方法？"><a href="#HashMap的重要方法put方法和resize方法？" class="headerlink" title="HashMap的重要方法put方法和resize方法？"></a>HashMap的重要方法put方法和resize方法？</h2><p>put():</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> V <span class="title">put</span><span class="params">(K key, V value)</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> putVal(hash(key), key, value, <span class="keyword">false</span>, <span class="keyword">true</span>);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Implements Map.put and related methods</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> hash hash for key</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> key the key</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> value the value to put</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> onlyIfAbsent if true, don't change existing value</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> evict if false, the table is in creation mode.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> previous value, or null if none</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">final</span> V <span class="title">putVal</span><span class="params">(<span class="keyword">int</span> hash, K key, V value, <span class="keyword">boolean</span> onlyIfAbsent,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">boolean</span> evict)</span> </span>{</span><br><span class="line"> Node<K,V>[] tab; Node<K,V> p; <span class="keyword">int</span> n, i;</span><br><span class="line"></span><br><span class="line"> <span class="comment">//如果还没有为hash表申请空间，那么就使用resize()方法初始化hash表。</span></span><br><span class="line"> <span class="keyword">if</span> ((tab = table) == <span class="keyword">null</span> || (n = tab.length) == <span class="number">0</span>)</span><br><span class="line"> n = (tab = resize()).length;</span><br><span class="line"> <span class="comment">//如果没有发生hash冲突，则直接将数据存入hash表中</span></span><br><span class="line"> <span class="keyword">if</span> ((p = tab[i = (n - <span class="number">1</span>) & hash]) == <span class="keyword">null</span>)</span><br><span class="line"> tab[i] = newNode(hash, key, value, <span class="keyword">null</span>);</span><br><span class="line"> <span class="comment">//如果发生了冲突</span></span><br><span class="line"> <span class="keyword">else</span> {</span><br><span class="line"> Node<K,V> e; K k;</span><br><span class="line"> <span class="comment">//判断是否与链表头结点相同</span></span><br><span class="line"> <span class="keyword">if</span> (p.hash == hash &&</span><br><span class="line"> ((k = p.key) == key || (key != <span class="keyword">null</span> && key.equals(k))))</span><br><span class="line"> e = p;</span><br><span class="line"> <span class="comment">//判断当前要插入的链表表示的结构是否是树，如果是则交给putTreeVal()处理</span></span><br><span class="line"> <span class="keyword">else</span> <span class="keyword">if</span> (p <span class="keyword">instanceof</span> TreeNode)</span><br><span class="line"> e = ((TreeNode<K,V>)p).putTreeVal(<span class="keyword">this</span>, tab, hash, key, value);</span><br><span class="line"></span><br><span class="line"> <span class="comment">//当要插入的数据不是头结点，并且链表没有被树化的情况下</span></span><br><span class="line"> <span class="keyword">else</span> {</span><br><span class="line"> <span class="comment">//遍历链表，判断是做修改还是插入操作</span></span><br><span class="line"> <span class="keyword">for</span> (<span class="keyword">int</span> binCount = <span class="number">0</span>; ; ++binCount) {</span><br><span class="line"> <span class="comment">//如果是插入操作</span></span><br><span class="line"> <span class="keyword">if</span> ((e = p.next) == <span class="keyword">null</span>) {</span><br><span class="line"> p.next = newNode(hash, key, value, <span class="keyword">null</span>);</span><br><span class="line"> <span class="comment">//判断是否达到树化的标准</span></span><br><span class="line"> <span class="keyword">if</span> (binCount >= TREEIFY_THRESHOLD - <span class="number">1</span>) <span class="comment">// -1 for 1st</span></span><br><span class="line"> treeifyBin(tab, hash); <span class="comment">//树化链表</span></span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//发现当前链表中的结点有与要插入的数据相同的key，跳出循环进行修改操作</span></span><br><span class="line"> <span class="keyword">if</span> (e.hash == hash &&</span><br><span class="line"> ((k = e.key) == key || (key != <span class="keyword">null</span> && key.equals(k))))</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> p = e;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//修改操作，，进行Value数据的修改</span></span><br><span class="line"> <span class="keyword">if</span> (e != <span class="keyword">null</span>) { <span class="comment">// existing mapping for key</span></span><br><span class="line"> V oldValue = e.value;</span><br><span class="line"> <span class="keyword">if</span> (!onlyIfAbsent || oldValue == <span class="keyword">null</span>)</span><br><span class="line"> e.value = value;</span><br><span class="line"> <span class="comment">//此方法是在LinkedHashMap中实现的，在HashMap中为空</span></span><br><span class="line"> afterNodeAccess(e);</span><br><span class="line"> <span class="keyword">return</span> oldValue;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> ++modCount;</span><br><span class="line"> <span class="comment">//判断put()后是否需要扩容</span></span><br><span class="line"> <span class="keyword">if</span> (++size > threshold)</span><br><span class="line"> resize();</span><br><span class="line"> <span class="comment">//此方法是在LinkedHashMap中实现的，在HashMap中为空</span></span><br><span class="line"> afterNodeInsertion(evict);</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>resize():</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">final</span> Node<K,V>[] resize() {</span><br><span class="line"> Node<K,V>[] oldTab = table;</span><br><span class="line"> <span class="keyword">int</span> oldCap = (oldTab == <span class="keyword">null</span>) ? <span class="number">0</span> : oldTab.length;</span><br><span class="line"> <span class="keyword">int</span> oldThr = threshold;</span><br><span class="line"> <span class="keyword">int</span> newCap, newThr = <span class="number">0</span>;</span><br><span class="line"> <span class="comment">//先确定新表的hash表长度与阀值。</span></span><br><span class="line"> <span class="keyword">if</span> (oldCap > <span class="number">0</span>) {</span><br><span class="line"> <span class="comment">//判断当前hash表的长度是否已经达到上限，如果是则将阀值设置为Integer.MAX_VALUE并返回</span></span><br><span class="line"> <span class="keyword">if</span> (oldCap >= MAXIMUM_CAPACITY) {</span><br><span class="line"> threshold = Integer.MAX_VALUE;</span><br><span class="line"> <span class="keyword">return</span> oldTab;</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//将容量大小增加为原来的二倍，并计算相应的阀值</span></span><br><span class="line"> <span class="keyword">else</span> <span class="keyword">if</span> ((newCap = oldCap << <span class="number">1</span>) < MAXIMUM_CAPACITY &&</span><br><span class="line"> oldCap >= DEFAULT_INITIAL_CAPACITY)</span><br><span class="line"> newThr = oldThr << <span class="number">1</span>; <span class="comment">// double threshold</span></span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span> <span class="keyword">if</span> (oldThr > <span class="number">0</span>) <span class="comment">// initial capacity was placed in threshold</span></span><br><span class="line"> newCap = oldThr;</span><br><span class="line"> <span class="keyword">else</span> { <span class="comment">// zero initial threshold signifies using defaults</span></span><br><span class="line"> newCap = DEFAULT_INITIAL_CAPACITY;</span><br><span class="line"> newThr = (<span class="keyword">int</span>)(DEFAULT_LOAD_FACTOR * DEFAULT_INITIAL_CAPACITY);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (newThr == <span class="number">0</span>) {</span><br><span class="line"> <span class="keyword">float</span> ft = (<span class="keyword">float</span>)newCap * loadFactor;</span><br><span class="line"> newThr = (newCap < MAXIMUM_CAPACITY && ft < (<span class="keyword">float</span>)MAXIMUM_CAPACITY ?</span><br><span class="line"> (<span class="keyword">int</span>)ft : Integer.MAX_VALUE);</span><br><span class="line"> }</span><br><span class="line"> threshold = newThr;</span><br><span class="line"> <span class="meta">@SuppressWarnings</span>({<span class="string">"rawtypes"</span>,<span class="string">"unchecked"</span>})</span><br><span class="line"> <span class="comment">//在确定hash表长度后，创建新表，将旧表中的数据进行迁移到新表。</span></span><br><span class="line"> Node<K,V>[] newTab = (Node<K,V>[])<span class="keyword">new</span> Node[newCap];</span><br><span class="line"> table = newTab;</span><br><span class="line"> <span class="keyword">if</span> (oldTab != <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">for</span> (<span class="keyword">int</span> j = <span class="number">0</span>; j < oldCap; ++j) {</span><br><span class="line"> Node<K,V> e;</span><br><span class="line"> <span class="keyword">if</span> ((e = oldTab[j]) != <span class="keyword">null</span>) {</span><br><span class="line"> oldTab[j] = <span class="keyword">null</span>;</span><br><span class="line"> <span class="keyword">if</span> (e.next == <span class="keyword">null</span>)</span><br><span class="line"> newTab[e.hash & (newCap - <span class="number">1</span>)] = e;</span><br><span class="line"> <span class="comment">//判断是否已经树化，如果是则调用树化的相应方法进行数据迁移</span></span><br><span class="line"> <span class="keyword">else</span> <span class="keyword">if</span> (e <span class="keyword">instanceof</span> TreeNode)</span><br><span class="line"> ((TreeNode<K,V>)e).split(<span class="keyword">this</span>, newTab, j, oldCap);</span><br><span class="line"> <span class="comment">//非树化链表的情况</span></span><br><span class="line"> <span class="keyword">else</span> { <span class="comment">// preserve order</span></span><br><span class="line"> Node<K,V> loHead = <span class="keyword">null</span>, loTail = <span class="keyword">null</span>;</span><br><span class="line"> Node<K,V> hiHead = <span class="keyword">null</span>, hiTail = <span class="keyword">null</span>;</span><br><span class="line"> Node<K,V> next;</span><br><span class="line"></span><br><span class="line"> <span class="comment">//这里的代码需要好好看，就是因为此处实现方式的原因，</span></span><br><span class="line"> <span class="comment">//导致了hashmap遍历时不能保证数据能够一直按照插入或者修改的顺序访问。</span></span><br><span class="line"> <span class="keyword">do</span> {</span><br><span class="line"> next = e.next;</span><br><span class="line"> <span class="keyword">if</span> ((e.hash & oldCap) == <span class="number">0</span>) {</span><br><span class="line"> <span class="keyword">if</span> (loTail == <span class="keyword">null</span>)</span><br><span class="line"> loHead = e;</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> loTail.next = e;</span><br><span class="line"> loTail = e;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">if</span> (hiTail == <span class="keyword">null</span>)</span><br><span class="line"> hiHead = e;</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> hiTail.next = e;</span><br><span class="line"> hiTail = e;</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">while</span> ((e = next) != <span class="keyword">null</span>);</span><br><span class="line"> <span class="keyword">if</span> (loTail != <span class="keyword">null</span>) {</span><br><span class="line"> loTail.next = <span class="keyword">null</span>;</span><br><span class="line"> newTab[j] = loHead;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (hiTail != <span class="keyword">null</span>) {</span><br><span class="line"> hiTail.next = <span class="keyword">null</span>;</span><br><span class="line"> newTab[j + oldCap] = hiHead;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> newTab;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>关于resize需要注意的是：<br>1.resize扩容后的容量是原来的两倍，直到容量达到最大，这时就会更改阈值来继续扩容。<br>2.正是因为resize的扩容原理，导致了Hashmap不能保证插入数据的顺序性，当然如果一定要保证，我们可以使用LinkedHashMap</p>
<h2 id="好文参考链接"><a href="#好文参考链接" class="headerlink" title="好文参考链接"></a>好文参考链接</h2><p>安琪拉连环问：<a href="https://gitbook.cn/books/5e8cb23a0e53912fafc48fd9/index.html" target="_blank" rel="noopener">https://gitbook.cn/books/5e8cb23a0e53912fafc48fd9/index.html</a></p>
<p>源码解读：<a href="https://www.imooc.com/article/24532?block_id=tuijian_wz" target="_blank" rel="noopener">https://www.imooc.com/article/24532?block_id=tuijian_wz</a></p>
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<a class="article-title" href="/2019/04/25/rabbitmq/" target="_blank">rabbitmq</a>
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<h2 id="1-依赖环境的安装-如果需要用编译安装erlang语言环境，需要安装C-编译。"><a href="#1-依赖环境的安装-如果需要用编译安装erlang语言环境，需要安装C-编译。" class="headerlink" title="1.依赖环境的安装-如果需要用编译安装erlang语言环境，需要安装C++编译。"></a>1.依赖环境的安装-如果需要用编译安装erlang语言环境，需要安装C++编译。</h2><pre><code>yum -y install make gcc gcc-c++ kernel-devel m4 ncurses-devel openssl-devel unixODBC unixODBC-devel httpd python-simplejson</code></pre><h2 id="2-erlang语言环境的安装-rabbitMq是用erlang分布式语言开发的"><a href="#2-erlang语言环境的安装-rabbitMq是用erlang分布式语言开发的" class="headerlink" title="2.erlang语言环境的安装(rabbitMq是用erlang分布式语言开发的)"></a>2.erlang语言环境的安装(rabbitMq是用erlang分布式语言开发的)</h2><h4 id="安装文件获取"><a href="#安装文件获取" class="headerlink" title="安装文件获取"></a>安装文件获取</h4><pre><code>wget http://erlang.org/download/otp_src_19.2.tar.gz</code></pre><h4 id="解压erlang安装包"><a href="#解压erlang安装包" class="headerlink" title="解压erlang安装包"></a>解压erlang安装包</h4><pre><code>tar -xvf otp_src_19.2.tar.gz</code></pre><h4 id="进入erlang目录"><a href="#进入erlang目录" class="headerlink" title="进入erlang目录"></a>进入erlang目录</h4><pre><code>cd otp_src_19.2</code></pre><h4 id="编译安装erlang语言环境-prefix-usr-local-erlang-为安装目录"><a href="#编译安装erlang语言环境-prefix-usr-local-erlang-为安装目录" class="headerlink" title="编译安装erlang语言环境 prefix=/usr/local/erlang 为安装目录"></a>编译安装erlang语言环境 prefix=/usr/local/erlang 为安装目录</h4><pre><code>./configure --prefix=/usr/local/erlang
--enable-smp-support
--enable-threads
--enable-sctp
--enable-kernel-poll
--enable-hipe
--with-ssl
--without-javac</code></pre><h4 id="erlang语言编译配置选项："><a href="#erlang语言编译配置选项：" class="headerlink" title="erlang语言编译配置选项："></a>erlang语言编译配置选项：</h4><pre><code>–prefix 指定安装目录
–enable-smp-support 启用对称多处理支持（Symmetric Multi-Processing对称多处理结构的简称）
–enable-threads 启用异步线程支持
–enable-sctp 启用流控制协议支持（Stream Control Transmission Protocol，流控制传输协议）
–enable-kernel-poll 启用Linux内核poll
–enable-hipe 启用高性能Erlang
–with-ssl 启用ssl包
–without-javac 不用java编译</code></pre><h4 id="开始安装编译："><a href="#开始安装编译：" class="headerlink" title="开始安装编译："></a>开始安装编译：</h4><pre><code>make && make install </code></pre><h4 id="配置erlang环境变量"><a href="#配置erlang环境变量" class="headerlink" title="配置erlang环境变量"></a>配置erlang环境变量</h4><pre><code>#vim /etc/profile
export PATH=$PATH:/usr/local/erlang/bin
#source /etc/profile</code></pre><h4 id="测试erlang安装是否成功"><a href="#测试erlang安装是否成功" class="headerlink" title="测试erlang安装是否成功"></a>测试erlang安装是否成功</h4><pre><code>#erl
Erlang/OTP 17 [erts-6.2] [source] [smp:2:2] [async-threads:10] [kernel-poll:false]
Eshell V6.2 (abort with ^G)
会输出 erlang安装版本号</code></pre><h2 id="3-安装RabbitMQ"><a href="#3-安装RabbitMQ" class="headerlink" title="3.安装RabbitMQ"></a>3.安装RabbitMQ</h2><h4 id="1-下载rabbitmq-server-3-6-9-tar-xz"><a href="#1-下载rabbitmq-server-3-6-9-tar-xz" class="headerlink" title="1)下载rabbitmq-server-3.6.9.tar.xz"></a>1)下载rabbitmq-server-3.6.9.tar.xz</h4><p><code>wget http://www.rabbitmq.com/releases/rabbitmq-server/v3.6.9/rabbitmq-server-generic-unix-3.6.9.tar.xz</code> </p>
<h4 id="2-对于下载xz包进行解压，首先先下载xz压缩工具："><a href="#2-对于下载xz包进行解压，首先先下载xz压缩工具：" class="headerlink" title="2)对于下载xz包进行解压，首先先下载xz压缩工具："></a>2)对于下载xz包进行解压，首先先下载xz压缩工具：</h4><p><code>yum install xz</code> </p>
<h4 id="3-对rabbitmq包进行解压："><a href="#3-对rabbitmq包进行解压：" class="headerlink" title="3)对rabbitmq包进行解压："></a>3)对rabbitmq包进行解压：</h4><pre><code>tar -xvf rabbitmq-server-generic-unix-3.6.9.tar</code></pre><h4 id="4-随后移动至-usr-local-下-改名rabbitmq："><a href="#4-随后移动至-usr-local-下-改名rabbitmq：" class="headerlink" title="4)随后移动至/usr/local/下 改名rabbitmq："></a>4)随后移动至/usr/local/下 改名rabbitmq：</h4><pre><code>cp -r rabbitmq_server-3.6.9 /usr/local/rabbitmq </code></pre><h4 id="5-这种下载的方式解压后直接可以使用，无需再编译安装；"><a href="#5-这种下载的方式解压后直接可以使用，无需再编译安装；" class="headerlink" title="5)这种下载的方式解压后直接可以使用，无需再编译安装；"></a>5)这种下载的方式解压后直接可以使用，无需再编译安装；</h4><pre><code>进入到rabbit文件内，其命令文件存在于sbin文件夹下，因此需要将sbin文件夹的路径添加到PATH中：
修改/etc/profile
export PATH=/usr/local/rabbitmq/sbin:$PATH
执行source /etc/profile使得PATH路径更新，rabbitMQ安装成功。 </code></pre><h4 id="6-随后启用MQ管理方式："><a href="#6-随后启用MQ管理方式：" class="headerlink" title="6)随后启用MQ管理方式："></a>6)随后启用MQ管理方式：</h4><pre><code>rabbitmq-plugins enable rabbitmq_management #启动后台管理
rabbitmq-server -detached #后台运行rabbitmq </code></pre><h4 id="7-设置端口号，可供外部访问："><a href="#7-设置端口号，可供外部访问：" class="headerlink" title="7)设置端口号，可供外部访问："></a>7)设置端口号，可供外部访问：</h4><pre><code>iptables -I INPUT -p tcp --dport 15672 -j ACCEPT
(不成功的话 #cd /etc/sysconfig #vim iptablesl里面加，然后#service iptables restart|阿里云的安全组中也要添加该端口的开放)</code></pre><h4 id="8-添加管理员账号"><a href="#8-添加管理员账号" class="headerlink" title="8)添加管理员账号"></a>8)添加管理员账号</h4><pre><code>rabbitmqctl add_user rabbitadmin 123456</code></pre><h4 id="9-分配用户标签"><a href="#9-分配用户标签" class="headerlink" title="9)分配用户标签"></a>9)分配用户标签</h4><pre><code>rabbitmqctl set_user_tags rabbitadmin administrator</code></pre><h4 id="10-创建和赋角色完成后查看并确认"><a href="#10-创建和赋角色完成后查看并确认" class="headerlink" title="10)创建和赋角色完成后查看并确认"></a>10)创建和赋角色完成后查看并确认</h4><pre><code>rabbitmqctl list_users
该命令使用户rabbitadmin具有‘/’这个virtual host中所有资源的配置、写、读权限以便管理其中的资源
rabbitmqctl set_permissions -p / rabbitadmin '.*' '.*' '.*'</code></pre><h4 id="11-登录rabbitmq管理界面"><a href="#11-登录rabbitmq管理界面" class="headerlink" title="11)登录rabbitmq管理界面"></a>11)登录rabbitmq管理界面</h4><pre><code>浏览器输入地址：http://服务器IP地址:15672/</code></pre>
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<p q-show="jsonFail" style="padding: 20px; font-size: 12px;">
缺失模块。<br/>1、请确保node版本大于6.2<br/>2、在博客根目录（注意不是yilia-plus根目录）执行以下命令：<br/> npm i hexo-generator-json-content --save<br/><br/>
3、在根目录_config.yml里添加配置：
<pre style="font-size: 12px;" q-show="jsonFail">
jsonContent:
meta: false
pages: false
posts:
title: true
date: true
path: true
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