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<a class="has-link-grey -link" href="/categories/%E6%8A%80%E6%9C%AF/">技术</a> / <a class="has-link-grey -link" href="/categories/%E6%8A%80%E6%9C%AF/Java/">Java</a>
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<a class="has-link-black-ter" href="/Java%E8%B0%83%E7%94%A8%E9%9D%99%E6%80%81%E6%96%B9%E6%B3%95%E9%9C%80%E8%A6%81%E7%B1%BB%E8%A3%85%E8%BD%BD%E8%BF%98%E6%98%AF%E5%88%9D%E5%A7%8B%E5%8C%96/">Java调用静态方法需要类装载还是初始化?</a>
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<h3 id="结论及原因"><a href="#结论及原因" class="headerlink" title="结论及原因"></a>结论及原因</h3><ul>
<li>结论：Java调用静态方法时会对类进行装载、连接和初始化</li>
<li>原因：Java类的加载方式是按需加载，遇到new、getstatic、putstatic或invokestatic这4条字节码指令时，如果类没有进行过初始化，则需要先触发其初始化。生成这4条指令的最常见的Java代码场景是：使用new关键字实例化对象的时候、读取或设置一个类的静态字段（被final修饰、已在编译期把结果放入常量池的静态字段除外）的时候，以及调用一个类的静态方法的时候。
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2018-01-21
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6 分钟 读完 (大约 946 个字)
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<h2 id="环境"><a href="#环境" class="headerlink" title="环境"></a>环境</h2><ul>
<li>系统: CentOS 7.3 x64</li>
<li>JDK: JDK1.8 8u161</li>
<li>Ant: apache-ant-1.10.1</li>
<li>Maven: apache-maven-3.5.2</li>
<li>Tomcat: apache-tomcat-8.5.24</li>
<li>ZooKeeper: zookeeper 3.4.11</li>
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<a class="has-link-grey -link" href="/categories/%E6%8A%80%E6%9C%AF/">技术</a> / <a class="has-link-grey -link" href="/categories/%E6%8A%80%E6%9C%AF/Java/">Java</a>
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10 分钟 读完 (大约 1485 个字)
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<h3 id="问题提出"><a href="#问题提出" class="headerlink" title="问题提出"></a>问题提出</h3><p>如果由一个类User，其中有一个方法add()，如下</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></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">User</span> </span>{</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">add</span><span class="params">()</span> </span>{</span><br><span class="line"> System.out.println(<span class="string">"add..."</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>如果要对add()方法扩展功能，比如在输出”add…”之前，先输出一句”before…”，在输出”add…”之后输出一句”after…”，那么就需要修改add()方法，如下</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></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">User</span> </span>{</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">add</span><span class="params">()</span> </span>{</span><br><span class="line"> System.out.println(<span class="string">"before..."</span>);</span><br><span class="line"> System.out.println(<span class="string">"add..."</span>);</span><br><span class="line"> System.out.println(<span class="string">"after..."</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>但是直接对add()方法进行修改，不利于系统维护，也容易产生代码的重复。比如在add()以及许多方法中，需要添加记录日志的功能，则需要在这些方法中写记录日志功能的逻辑，或者调用记录日志功能的方法，这会产生很多重复的代码，不利于模块的重用。
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<p> 百度一下java的static块执行时机，搜出来的文章有两种说法，第一种说static块是在类的加载时执行(包括我看过的Java视频都是这么说的)，另一种则是反对第一种说法，即static块并不是在类的加载时执行的，而是在类的初始化时执行的；谁对谁错，事实用代码证明。
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