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<a href="/2020/11/08/%E8%81%8A%E8%81%8A-Java-%E7%9A%84%E7%B1%BB%E5%8A%A0%E8%BD%BD%E6%9C%BA%E5%88%B6/" class="post-title-link" itemprop="url">聊聊 Java 的类加载机制一</a>
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,
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<a href="/categories/Java/%E7%B1%BB%E5%8A%A0%E8%BD%BD/" itemprop="url" rel="index"><span itemprop="name">类加载</span></a>
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<span id="/2020/11/08/%E8%81%8A%E8%81%8A-Java-%E7%9A%84%E7%B1%BB%E5%8A%A0%E8%BD%BD%E6%9C%BA%E5%88%B6/" class="post-meta-item leancloud_visitors" data-flag-title="聊聊 Java 的类加载机制一" title="Views">
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<p>一说到这个主题，想到的应该是双亲委派模型，不过讲的包括但不限于这个，主要内容是参考深入理解 Java 虚拟机书中的介绍，<br>一个类型的生命周期包含了七个阶段，加载，验证，准备，解析，初始化，使用，卸载。</p>
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<ul>
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<li><h2 id="加载"><a href="#加载" class="headerlink" title="加载"></a>加载</h2></li>
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</ul>
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<ol>
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<li>通过一个类的全限定名来获取定义此类的二进制字节流</li>
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<li>将这个字节流代表的静态存储结构转化为方法区的运行时数据结构</li>
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<li>在内存中生成了一个代表这个类的 java.lang.Class 对象，作为方法区这个类的各种数据的访问入口</li>
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</ol>
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<ul>
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<li><h2 id="验证"><a href="#验证" class="headerlink" title="验证"></a>验证</h2></li>
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</ul>
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<ol>
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<li>文件格式验证</li>
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<li>元数据验证</li>
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<li>字节码验证</li>
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<li>符号引用验证</li>
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</ol>
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<ul>
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<li><h2 id="准备"><a href="#准备" class="headerlink" title="准备"></a>准备</h2><p>准备阶段是正式为类中定义的变量（即静态变量，被static修饰的变量）分配内存并设置类变量初始值的阶段</p>
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</li>
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<li><h2 id="解析"><a href="#解析" class="headerlink" title="解析"></a>解析</h2><p>解析阶段是 Java 虚拟机将常量池内的符号引用替换为直接引用的过程</p>
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</li>
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</ul>
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<p>以上<a href="##链接">验证</a>、<a href="##准备">准备</a>、<a href="##解析">解析</a> 三个阶段又合称为链接阶段，链接阶段要做的是将加载到JVM中的二进制字节流的类数据信息合并到JVM的运行时状态中。</p>
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<ul>
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<li><h2 id="初始化"><a href="#初始化" class="headerlink" title="初始化"></a>初始化</h2>类的初始化阶段是类加载过程的最后一个步骤，也是除了自定义类加载器之外将主动权交给了应用程序，其实就是执行类构造器<clinit>()方法的过程，<clinit>()并不是我们在 Java 代码中直接编写的方法，它是 Javac编译器的自动生成物，<clinit>()方法是由编译器自动收集类中的所有类变量的复制动作和静态句块(static{}块)中的语句合并产生的，编译器收集的顺序是由语句在原文件中出现的顺序决定的，静态语句块中只能访问定义在静态语句块之前的变量，定义在它之后的变量，在前面的静态语句块可以复制，但是不能访问，同时还要保证父类的执行先于子类，然后保证多线程下的并发问题</li>
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</ul>
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<p>最终，方法区会存储当前类类信息，包括类的静态变量、类初始化代码（定义静态变量时的赋值语句 和 静态初始化代码块）、实例变量定义、实例初始化代码（定义实例变量时的赋值语句实例代码块和构造方法）和实例方法，还有父类的类信息引用。</p>
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<p>在前司和目前公司，用的配置中心都是使用的 Apollo，经过了业界验证，比较强大的配置管理系统，特别是在0.10 后开始支持对使用 value 注解的配置值进行自动更新，今天刚好有个同学问到我，就顺便写篇文章记录下，其实也是借助于 spring 强大的 bean 生命周期管理，可以实现BeanPostProcessor接口，使用postProcessBeforeInitialization方法，来对bean 内部的属性和方法进行判断，是否有 value 注解，如果有就是将它注册到一个 map 中，可以看到这个方法<code>com.ctrip.framework.apollo.spring.annotation.SpringValueProcessor#processField</code></p>
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<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></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">processField</span><span class="params">(Object bean, String beanName, Field field)</span> </span>{</span><br><span class="line"> <span class="comment">// register @Value on field</span></span><br><span class="line"> Value value = field.getAnnotation(Value<span class="class">.<span class="keyword">class</span>)</span>;</span><br><span class="line"> <span class="keyword">if</span> (value == <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">return</span>;</span><br><span class="line"> }</span><br><span class="line"> Set<String> keys = placeholderHelper.extractPlaceholderKeys(value.value());</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (keys.isEmpty()) {</span><br><span class="line"> <span class="keyword">return</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">for</span> (String key : keys) {</span><br><span class="line"> SpringValue springValue = <span class="keyword">new</span> SpringValue(key, value.value(), bean, beanName, field, <span class="keyword">false</span>);</span><br><span class="line"> springValueRegistry.register(beanFactory, key, springValue);</span><br><span class="line"> logger.debug(<span class="string">"Monitoring {}"</span>, springValue);</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>然后我们看下这个<code>springValueRegistry</code>是啥玩意</p>
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<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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">SpringValueRegistry</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">long</span> CLEAN_INTERVAL_IN_SECONDS = <span class="number">5</span>;</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> Map<BeanFactory, Multimap<String, SpringValue>> registry = Maps.newConcurrentMap();</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> AtomicBoolean initialized = <span class="keyword">new</span> AtomicBoolean(<span class="keyword">false</span>);</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> Object LOCK = <span class="keyword">new</span> Object();</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">register</span><span class="params">(BeanFactory beanFactory, String key, SpringValue springValue)</span> </span>{</span><br><span class="line"> <span class="keyword">if</span> (!registry.containsKey(beanFactory)) {</span><br><span class="line"> <span class="keyword">synchronized</span> (LOCK) {</span><br><span class="line"> <span class="keyword">if</span> (!registry.containsKey(beanFactory)) {</span><br><span class="line"> registry.put(beanFactory, LinkedListMultimap.<String, SpringValue>create());</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"> registry.get(beanFactory).put(key, springValue);</span><br><span class="line"></span><br><span class="line"> <span class="comment">// lazy initialize</span></span><br><span class="line"> <span class="keyword">if</span> (initialized.compareAndSet(<span class="keyword">false</span>, <span class="keyword">true</span>)) {</span><br><span class="line"> initialize();</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>这类其实就是个 map 来存放 springvalue，然后有<code>com.ctrip.framework.apollo.spring.property.AutoUpdateConfigChangeListener</code>来监听更新操作，当有变更时</p>
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<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></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onChange</span><span class="params">(ConfigChangeEvent changeEvent)</span> </span>{</span><br><span class="line"> Set<String> keys = changeEvent.changedKeys();</span><br><span class="line"> <span class="keyword">if</span> (CollectionUtils.isEmpty(keys)) {</span><br><span class="line"> <span class="keyword">return</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">for</span> (String key : keys) {</span><br><span class="line"> <span class="comment">// 1. check whether the changed key is relevant</span></span><br><span class="line"> Collection<SpringValue> targetValues = springValueRegistry.get(beanFactory, key);</span><br><span class="line"> <span class="keyword">if</span> (targetValues == <span class="keyword">null</span> || targetValues.isEmpty()) {</span><br><span class="line"> <span class="keyword">continue</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 2. check whether the value is really changed or not (since spring property sources have hierarchies)</span></span><br><span class="line"> <span class="comment">// 这里其实有一点比较绕，是因为 Apollo 里的 namespace 划分，会出现 key 相同，但是 namespace 不同的情况，所以会有个优先级存在，所以需要去校验 environment 里面的是否已经更新，如果未更新则表示不需要更新</span></span><br><span class="line"> <span class="keyword">if</span> (!shouldTriggerAutoUpdate(changeEvent, key)) {</span><br><span class="line"> <span class="keyword">continue</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 3. update the value</span></span><br><span class="line"> <span class="keyword">for</span> (SpringValue val : targetValues) {</span><br><span class="line"> updateSpringValue(val);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>其实原理很简单，就是得了解知道下</p>
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<h2 id="题目介绍"><a href="#题目介绍" class="headerlink" title="题目介绍"></a>题目介绍</h2><p>给定一个二叉树，找出其最大深度。</p>
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<p>二叉树的深度为根节点到最远叶子节点的最长路径上的节点数。</p>
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<p>说明: 叶子节点是指没有子节点的节点。</p>
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<p>示例：<br>给定二叉树 [3,9,20,null,null,15,7]，</p>
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<figure class="highlight plain"><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></pre></td><td class="code"><pre><span class="line"> 3</span><br><span class="line"> / \</span><br><span class="line">9 20</span><br><span class="line"> / \</span><br><span class="line"> 15 7</span><br></pre></td></tr></table></figure>
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<p>返回它的最大深度 3 。</p>
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<h2 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 主体是个递归的应用</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">maxDepth</span><span class="params">(TreeNode root)</span> </span>{</span><br><span class="line"> <span class="comment">// 节点的退出条件之一</span></span><br><span class="line"> <span class="keyword">if</span> (root == <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">int</span> left = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">int</span> right = <span class="number">0</span>;</span><br><span class="line"> <span class="comment">// 存在左子树，就递归左子树</span></span><br><span class="line"> <span class="keyword">if</span> (root.left != <span class="keyword">null</span>) {</span><br><span class="line"> left = maxDepth(root.left);</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">// 存在右子树，就递归右子树</span></span><br><span class="line"> <span class="keyword">if</span> (root.right != <span class="keyword">null</span>) {</span><br><span class="line"> right = maxDepth(root.right);</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">// 前面返回后，左右取大者</span></span><br><span class="line"> <span class="keyword">return</span> Math.max(left + <span class="number">1</span>, right + <span class="number">1</span>);</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<h2 id="分析"><a href="#分析" class="headerlink" title="分析"></a>分析</h2><p>其实对于树这类题，一般是以递归形式比较方便，只是要注意退出条件</p>
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<p>终于回忆起来了，年纪大了写这种东西真的要立马写，不然很容易想不起来，那天应该是 9 月 12 日，也就是上周六，因为我爸也去了，而且娘亲（丈母娘，LD 这么叫，我也就随了她这么叫，当然是背后，当面就叫妈）也在那，早上一到那二爹就给我爸指挥了活，要挖一条院子的出水道，自己想出来的词，因为觉得下水道是竖的，在那稍稍帮了一会会忙，然后我还是比较惯例的跟着 LD 还有娘亲去住的家里，主要是老丈人可能也不太想让我干太累的活，因为上次已经差不多把三楼都整理干净了，然后就是二楼了，二楼说实话我也帮不上什么忙，主要是衣服被子什么的，正好是有张以前小孩子睡过的那种摇篮床，看上去虽然有一些破损，整体还是不错的，所以打算拿过去，我就负责把它拆掉了，比较简单的是只要拧螺丝就行了，但是其实是用了好多好多工具才搞定的，一开始只要螺丝刀就行了，但是因为年代久了，后面的螺帽也有点锈住或者本身就会串着会一起动，所以拿来了个扳手，大部分的其实都被这两个工具给搞定了，但是后期大概还剩下四分之一的时候，有一颗完全锈住，并且螺纹跟之前那些都不一样，但是这个已经是最大的螺丝刀了，也没办法换个大的了，所以又去找来个一字的，因为十字的不是也可以用一字的拧嘛，结果可能是我买的工具箱里的一字螺丝刀太新了，口子那很锋利，直接把螺丝花纹给划掉了，大的小的都划掉，然后真的变成凹进去一个圆柱体了，然后就想能不能隔一层布去拧，然而因为的确是已经变成圆柱体了，布也不太给力，不放弃的我又去找来了个老虎钳，妄图把划掉的螺丝用老虎钳钳住，另一端用扳手拧开螺帽，但是这个螺丝跟螺帽真的是生锈的太严重了，外加上钳不太牢，完全是两边一起转，实在是没办法了，在征得同意之后，直接掰断了，火死了，一颗螺丝折腾得比我拆一张床还久，那天因为早上去的也比较晚了，然后就快吃午饭了，正好想着带一点东西过去，就把一些脸盆，泡脚桶啥的拿过去了，先是去吃了饭，还是在那家快餐店，菜的口味还是依然不错，就是人比较多，我爸旁边都是素菜，都没怎么吃远一点的荤菜，下次要早点去，把荤菜放我爸旁边😄（PS：他们家饭还是依然尴尬，需要等），吃完就开到在修的房子那把东西拿了出来，我爸已经动作很快的打了一小半的地沟了，说实话那玩意真的是很重，我之前把它从三楼拿下来，就觉得这个太重了，这次还要用起来，感觉我的手会分分钟废掉，不过一开始我还是跟着LD去了住的家里，惯例睡了午觉，那天睡得比较踏实，竟然睡了一个小时，醒了想了下，其实LD她们收拾也用不上我（没啥力气活），我还是去帮我爸他们，跟LD说了下就去了在修的老房子那，两位老爹在一起钻地，看着就很累，我连忙上去想换一会他们，因为刚好是钻到混凝土地线，特别难，力道不够就会滑开，用蛮力就是钻进去拔不出来，原理是因为本身浇的时候就是很紧实的，需要边钻边动，那家伙实在是太重了，真的是汗如雨下，基本是三个人轮流来，我是个添乱的，经常卡住，然后把地线，其实就是一条混凝土横梁，里面还有14跟18的钢筋，需要割断，这个割断也是很有技巧，钢筋本身在里面是受到挤压的，直接用切割的，到快断掉的时候就会崩一下，非常危险，还是老丈人比较有经验，要留一点点，然后直接用榔头敲断就好了，本来以为这个是最难的了，结果下面是一块非常大的青基石，而且也是石头跟石头挤一块，边上一点点打钻有点杯水车薪，后来是用那种螺旋的钻，钻四个洞，相对位置大概是个长方形，这样子把中间这个长方形钻出来就比较容易地能拿出来了，后面的也容易搞出来了，后面的其实难度不是特别大了，主要是地沟打好之后得看看高低是不是符合要求的，不能本来是往外排水的反而外面高，这个怎么看就又很有技巧了，一般在地上的只要侧着看一下就好了，考究点就用下水平尺，但是在地下的，不用水平尺，其实可以借助于地沟里正要放进去的水管，放点水进去，看水往哪流就行了，铺好水管后，就剩填埋的活了，不是太麻烦了，那天真的是累到了，打那个混凝土的时候我真的是把我整个人压上去了，不过也挺爽的，有点把平时无处发泄的蛮力发泄出去了。</p>
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<p>又 roll 到了一个以前做过的题，不过现在用 Java 也来写一下，是 easy 级别的，所以就简单说下</p>
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<h2 id="简要介绍"><a href="#简要介绍" class="headerlink" title="简要介绍"></a>简要介绍</h2><p>You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes contains a single digit. Add the two numbers and return the sum as a linked list.</p>
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<p>You may assume the two numbers do not contain any leading zero, except the number 0 itself.<br>就是给了两个链表，用来表示两个非负的整数，在链表中倒序放着，每个节点包含一位的数字，把他们加起来以后也按照原来的链表结构输出</p>
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<h2 id="样例"><a href="#样例" class="headerlink" title="样例"></a>样例</h2><h4 id="example-1"><a href="#example-1" class="headerlink" title="example 1"></a>example 1</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Input: l1 = [2,4,3], l2 = [5,6,4]</span><br><span class="line">Output: [7,0,8]</span><br><span class="line">Explanation: 342 + 465 = 807.</span><br></pre></td></tr></table></figure>
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<h4 id="example-2"><a href="#example-2" class="headerlink" title="example 2"></a>example 2</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">Input: l1 = [0], l2 = [0]</span><br><span class="line">Output: [0]</span><br></pre></td></tr></table></figure>
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<h4 id="example-3"><a href="#example-3" class="headerlink" title="example 3"></a>example 3</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">Input: l1 = [9,9,9,9,9,9,9], l2 = [9,9,9,9]</span><br><span class="line">Output: [8,9,9,9,0,0,0,1]</span><br></pre></td></tr></table></figure>
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<h2 id="题解"><a href="#题解" class="headerlink" title="题解"></a>题解</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="function"><span class="keyword">public</span> ListNode <span class="title">addTwoNumbers</span><span class="params">(ListNode l1, ListNode l2)</span> </span>{</span><br><span class="line"> ListNode root = <span class="keyword">new</span> ListNode();</span><br><span class="line"> <span class="keyword">if</span> (l1 == <span class="keyword">null</span> && l2 == <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">return</span> root;</span><br><span class="line"> }</span><br><span class="line"> ListNode tail = root;</span><br><span class="line"> <span class="keyword">int</span> entered = <span class="number">0</span>;</span><br><span class="line"> <span class="comment">// 这个条件加了 entered，就是还有进位的数</span></span><br><span class="line"> <span class="keyword">while</span> (l1 != <span class="keyword">null</span> || l2 != <span class="keyword">null</span> || entered != <span class="number">0</span>) {</span><br><span class="line"> <span class="keyword">int</span> temp = entered;</span><br><span class="line"> <span class="keyword">if</span> (l1 != <span class="keyword">null</span>) {</span><br><span class="line"> temp += l1.val;</span><br><span class="line"> l1 = l1.next;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (l2 != <span class="keyword">null</span>) {</span><br><span class="line"> temp += l2.val;</span><br><span class="line"> l2 = l2.next;</span><br><span class="line"> }</span><br><span class="line"> entered = (temp - temp % <span class="number">10</span>) / <span class="number">10</span>;</span><br><span class="line"> tail.val = temp % <span class="number">10</span>;</span><br><span class="line"> <span class="comment">// 循环内部的控制是为了排除最后的空节点</span></span><br><span class="line"> <span class="keyword">if</span> (l1 != <span class="keyword">null</span> || l2 != <span class="keyword">null</span> || entered != <span class="number">0</span>) {</span><br><span class="line"> tail.next = <span class="keyword">new</span> ListNode();</span><br><span class="line"> tail = tail.next;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"><span class="comment">// tail = null;</span></span><br><span class="line"> <span class="keyword">return</span> root;</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<p>这里唯二需要注意的就是两个点，一个是循环条件需要包含进位值还存在的情况，还有一个是最后一个节点，如果是空的了，就不要在 new 一个出来了，写的比较挫</p>
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// defer loading until the whole page loading is completed
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window.addEventListener('load', loadCount, false);
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</script>
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</body>
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</html>
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