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<a class="post-title-link" href="/2017/07/27/Meta annotation/" itemprop="url">Annotation-元注解</a></h1>
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<h2 id="元注解"><a href="#元注解" class="headerlink" title="元注解"></a>元注解</h2><p>Java里面定义了4个标准的元注解:</p>
<ol>
<li>@Target</li>
<li>@Retention</li>
<li>@Documented</li>
<li>@Inherited</li>
</ol>
<p>这四个元注解的作用是负责注解其他注解，其他所有的注解都是通过元注解扩散开来。</p>
<h3 id="Target"><a href="#Target" class="headerlink" title="Target"></a><code>Target</code></h3><p>这个元注解的作用是负责指明注解的作用域。如果指明类型为<code>METHOD</code>，说明这个注解只能用在方法上面。<br>以下是可以指明<code>Target</code>的所有作用类型：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <span class="keyword">enum</span> ElementType {</div><div class="line"> ANNOTATION_TYPE,</div><div class="line"> CONSTRUCTOR,</div><div class="line"> FIELD,</div><div class="line"> LOCAL_VARIABLE,</div><div class="line"> METHOD,</div><div class="line"> PACKAGE,</div><div class="line"> PARAMETER,</div><div class="line"> TYPE,</div><div class="line"> TYPE_PARAMETER,</div><div class="line"> TYPE_USE;</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">private</span> <span class="title">ElementType</span><span class="params">()</span> </span>{</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure></p>
<h3 id="Retention"><a href="#Retention" class="headerlink" title="Retention"></a><code>Retention</code></h3><p>这个元注解的作用是对Annotation的<code>作用时间</code>进行限制：某些Annotation仅出现在源代码中，而被编译器丢弃；而另一些却被编译在class文件中；编译在class文件中的Annotation可能会被虚拟机忽略，而另一些在class被装载时将被读取。<br>以下是可以指明<code>Retention</code>的所有作用类型：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <span class="keyword">enum</span> RetentionPolicy {</div><div class="line"> CLASS,</div><div class="line"> RUNTIME,</div><div class="line"> SOURCE;</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">private</span> <span class="title">RetentionPolicy</span><span class="params">()</span> </span>{</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure></p>
<ul>
<li><code>RetentionPolicy.SOURCE</code>:在源文件中有效</li>
<li><code>RetentionPolicy.CLASS</code>:在class文件中有效</li>
<li><code>RetentionPolicy.RUNTIME</code>:在运行时有效</li>
</ul>
<h3 id="Documented"><a href="#Documented" class="headerlink" title="Documented"></a><code>Documented</code></h3><p>这个元注解的作用是标识是否能够在生成JavaDoc文档是，注解依然保存。这个只是一个标记注解，没有任何成员。<br>如下：<br>1.标记有<code>Documented</code>的Annotation与生成的JavaDoc文档<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line"><span class="meta">@Target</span>(ElementType.CONSTRUCTOR)</div><div class="line"><span class="meta">@Inherited</span></div><div class="line"><span class="meta">@Documented</span></div><div class="line"><span class="meta">@Retention</span>(RetentionPolicy.SOURCE)</div><div class="line"><span class="keyword">public</span> <span class="meta">@interface</span> SourceAnnotation {</div><div class="line"> <span class="function">String <span class="title">name</span><span class="params">()</span></span>;</div><div class="line"> <span class="function">String <span class="title">age</span><span class="params">()</span></span>;</div><div class="line"> <span class="function">String <span class="title">gender</span><span class="params">()</span> <span class="keyword">default</span> "Male"</span>;</div><div class="line">}</div></pre></td></tr></table></figure></p>
<p><img src="/blog-img/annotation-person-documented.png" alt="annotation-person-documented"><br>2.没有标记的Annotation与生成的JavaDoc文档<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line"><span class="meta">@Target</span>(ElementType.CONSTRUCTOR)</div><div class="line"><span class="meta">@Inherited</span></div><div class="line"><span class="meta">@Retention</span>(RetentionPolicy.SOURCE)</div><div class="line"><span class="keyword">public</span> <span class="meta">@interface</span> SourceAnnotation {</div><div class="line"> <span class="function">String <span class="title">name</span><span class="params">()</span></span>;</div><div class="line"> <span class="function">String <span class="title">age</span><span class="params">()</span></span>;</div><div class="line"> <span class="function">String <span class="title">gender</span><span class="params">()</span> <span class="keyword">default</span> "Male"</span>;</div><div class="line">}</div></pre></td></tr></table></figure></p>
<p><img src="/blog-img/annotation-person-not-documented.png" alt="annotation-person-not-documented"></p>
<p>使用注解的类：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Person</span> </span>{</div><div class="line"> <span class="keyword">private</span> String name;</div><div class="line"></div><div class="line"> <span class="meta">@SourceAnnotation</span>(</div><div class="line"> name=<span class="string">"Person"</span>,</div><div class="line"> age=<span class="string">"1"</span></div><div class="line"> )</div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Person</span><span class="params">(String name)</span> </span>{</div><div class="line"> <span class="keyword">this</span>.name = name;</div><div class="line"> }</div><div class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">getName</span><span class="params">()</span> </span>{</div><div class="line"> <span class="keyword">return</span> name;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>{</div><div class="line"> <span class="keyword">this</span>.name = name;</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure></p>
<h3 id="Inherited"><a href="#Inherited" class="headerlink" title="Inherited"></a><code>Inherited</code></h3><p>这个元注解的作用是来阐述某个被标注的类型是可以被继承的。如果一个使用了@Inherited修饰的annotation类型被用于一个class，则这个annotation将被用于该class的子类。</p>
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<p>本文最初分享在<code>卡牛玩卡互助学堂</code>微信群，后期整理而成。</p>
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<p>我大概从高中起就有跑步的习惯，不过之前都是短距离慢跑，三五公里的样子，现在倾向于长跑（>10km），时间足够的情况下长跑是很舒服的。</p>
<p><strong>关于呼吸</strong></p>
<p>一开始我也是用嘴呼吸的，后来别人看我跑起来总是气喘吁吁的，于是教我用鼻子呼吸，适应了几次后，我觉得这种方式非常好，呼吸起来有节奏感，跑起来也不感觉有那么累。上次焦总带来的教练也说了，用嘴或者用鼻子呼气都行，关键要有呼吸节奏。在没有加速的前提下，如果越跑呼吸越大，说明节奏是有问题的。</p>
<p><strong>关于跑步姿势</strong></p>
<p>头部不要前倾，目视前方，双肩放松，前后摆臂，前脚掌先落地，不要把力量集中在后脚跟，落地轻盈，膝盖处减少用力。跑步的姿势很重要，如果不对的话长时间跑步会对膝盖造成损伤。<br><img src="/blog-img/20160912-running-posture.png" alt="跑步姿势"></p>
<p><strong>关于跑步速度</strong></p>
<p>速度是跑步成绩的直接体现，刚开始时很多人关注速度胜过关注距离。我的经验是可以更多的关注距离、时间以及身体的感受。特别是对于初跑者，倾听身体的声音，更有利于提高成绩，跑步速度按照不会气喘，能正常交谈为宜。</p>
<p><strong>关于长距离跑</strong></p>
<p>其实跑步就是一项考验耐力的运动，就是身体承受力。如果节奏对了，身体又承受得起，一直跑下去都没有问题。不要在觉得很累的时候停下来，有时候跨过了这个很累的点，你又能多跑几公里，可以通过这样子锻炼自己的耐力。之前我很累的时候就是脚都几乎抬不起来了，以这样的方式坚持几分钟，会发现跑起来又轻松许多。LSD是长距离慢跑，这种方式也可以提高耐力，一般是20~35km。更多的跑者常见术语，可以<a href="http://mp.weixin.qq.com/s?__biz=MzA5ODE5MzkyNA==&mid=2655241236&idx=1&sn=de94380ff62a3dc9a955ac9bff4d8127&scene=0#wechat_redirect" target="_blank" rel="external">看这里</a></p>
<p><strong>关于装备</strong></p>
<p>对于装备控而言，装备不是表明要取得多好的成绩，而是表示坚持跑步的决心，只要决心有了，不用太烧装备，如果还没有决心，就通过烧装备建立吧。跑鞋是最基本的装备，既然不能通过成绩表明我们是个高手，那至少要用跑鞋证明我们是跑步爱好者。经济又实惠的跑鞋可以到迪卡侬购买，我现在穿的就是KALENJI系列的跑鞋，更专业的可以考虑asics跑鞋，价格略贵。</p>
<p>配速表和心率监控对于常跑者也是基本装备。心率可以通过心率带来监控，通过心率既能了解自己的身体状况，保证自己的安全，也能根据当前心率调整自己的跑步节奏。配速表的品牌就比较多了，Garmin是专业运动手表，SUnnto是专业户外品牌。我自己配备的是Garmin FENIX3HR，配备了光电心率功能，主要用于跑步、骑车和游泳。</p>
<p><strong>跑步也要量力而行，对于没有经常跑步的同学，一下子就跑得很远这样很容易受伤，之前跟我一起跑步的跑友就是因为这样子，跑了几次后脚疼，去医院看骨伤科，休养了几个月，现在才可以勉强跑起来。</strong></p>
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<p>1.Uncaught ReferenceError: NPObject deleted<br>如果js注入遇到此类问题，无法执行，可以考虑一下是不是用了iframe框架导致的。</p>
<p>2.uri的<code>getQueryParameter()</code>引起的问题<br>用这个方法找寻url里面的参数时，最好检查一下该uri是否是<code>isHierarchical()</code>，不然会<code>throw new UnsupportedOperationException(NOT_HIERARCHICAL)</code></p>
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<p><strong>怎么样用Chrome实现自定义UserAgent呢</strong></p>
<p>目前我的Chrome版本为<code>44.0.2403.157 (64-bit)</code>，可以采用下面的方式实现：</p>
<p>1.点击右键－审查元素（<code>Ctrl+Shift+I</code>），调出调试界面，进入右上方的设置界面；</p>
<p><img src="/blog-img/20151106-custom-user-agent-1.png" alt="Custom-User-Agent"></p>
<p>2.设置页面有一个<code>Devices</code>选项，选择Add Custom device</p>
<p><img src="/blog-img/20151106-custom-user-agent-2.png" alt="Custom-User-Agent"></p>
<p>3.填入对应的信息保存就可以了．</p>
<p><img src="/blog-img/20151106-custom-user-agent-3.png" alt="Custom-User-Agent"></p>
<p>4.需要用该设备时，在调试页面的左上方选择你建立的Device就可以了</p>
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