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<h1 id="ThreadLocal详解"><a href="#ThreadLocal详解" class="headerlink" title="ThreadLocal详解"></a>ThreadLocal详解</h1><h2 id="ThreadLocal"><a href="#ThreadLocal" class="headerlink" title="ThreadLocal"></a><a href="https://www.cnblogs.com/dolphin0520/p/3920407.html" target="_blank" rel="noopener">ThreadLocal</a></h2>
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<h1 id="单例模式（Java）"><a href="#单例模式（Java）" class="headerlink" title="单例模式（Java）"></a>单例模式（Java）</h1><h2 id="一、实现案例"><a href="#一、实现案例" class="headerlink" title="一、实现案例"></a>一、实现案例</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><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></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> woshi</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span> (懒汉式)套路加入并发控制，在多线程环境下，对外存在一个对象</span></span><br><span class="line"><span class="comment"> * 1、构造器私有化-》避免外部new对象</span></span><br><span class="line"><span class="comment"> * 2、提供私有的静态属性-》存储对象地址</span></span><br><span class="line"><span class="comment"> * 3、提供公共的静态方法-》获取属性</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span> 2020/5/10</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DoubleCheckedLocking</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">volatile</span> <span class="keyword">static</span> DoubleCheckedLocking instance;<span class="comment">/*没有volatile，可能会访问到一个空对象*/</span></span><br><span class="line"></span><br><span class="line"> <span class="comment">/*构造器私有化*/</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="title">DoubleCheckedLocking</span><span class="params">()</span></span>{}</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> DoubleCheckedLocking <span class="title">getInstance</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> != instance) { <span class="comment">/*再次检测*/</span></span><br><span class="line"> <span class="keyword">return</span> instance;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">synchronized</span> (DoubleCheckedLocking.class) {</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> == instance) {</span><br><span class="line"> instance = <span class="keyword">new</span> DoubleCheckedLocking();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> instance;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> <span class="keyword">new</span> Thread(()-> System.out.println(DoubleCheckedLocking.getInstance())).start();</span><br><span class="line"></span><br><span class="line"> System.out.println(DoubleCheckedLocking.getInstance());</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h2 id="二、java中应用（略）"><a href="#二、java中应用（略）" class="headerlink" title="二、java中应用（略）"></a>二、java中应用（略）</h2>
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<h1 id="java学习路线"><a href="#java学习路线" class="headerlink" title="java学习路线"></a>java学习路线</h1><p><img src="../../public/images/JavaLearning.jpg" alt="Java学习脑图"></p>
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<h1 id="静态代理设计模式（Java"><a href="#静态代理设计模式（Java" class="headerlink" title="静态代理设计模式（Java)"></a>静态代理设计模式（Java)</h1><h2 id="一、组成示例"><a href="#一、组成示例" class="headerlink" title="一、组成示例"></a>一、组成示例</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><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> thread;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> woshi</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span> 静态代理</span></span><br><span class="line"><span class="comment"> * 接口：</span></span><br><span class="line"><span class="comment"> * 1、真实角色</span></span><br><span class="line"><span class="comment"> * 2、代理角色</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span> 2020/5/7</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">StaticProxy</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> <span class="keyword">new</span> WeddingCompany(<span class="keyword">new</span> You()).happyMarry();</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">interface</span> <span class="title">Marry</span></span>{</span><br><span class="line"> <span class="function"><span class="keyword">void</span> <span class="title">happyMarry</span><span class="params">()</span></span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">You</span> <span class="keyword">implements</span> <span class="title">Marry</span></span>{</span><br><span class="line"></span><br><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">happyMarry</span><span class="params">()</span> </span>{</span><br><span class="line"> System.out.println(<span class="string">"Today, I married."</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">WeddingCompany</span> <span class="keyword">implements</span> <span class="title">Marry</span></span>{</span><br><span class="line"> <span class="comment">//真实角色</span></span><br><span class="line"> <span class="keyword">private</span> Marry target;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">WeddingCompany</span><span class="params">(Marry target)</span></span>{</span><br><span class="line"> <span class="keyword">this</span>.target = target;</span><br><span class="line"> }</span><br><span class="line"></span><br><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">happyMarry</span><span class="params">()</span> </span>{</span><br><span class="line"> ready();</span><br><span class="line"> <span class="keyword">this</span>.target.happyMarry();</span><br><span class="line"> after();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">ready</span><span class="params">()</span></span>{</span><br><span class="line"> System.out.println(<span class="string">"布置会场！！"</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">after</span><span class="params">()</span></span>{</span><br><span class="line"> System.out.println(<span class="string">"婚礼结束！！"</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h2 id="二、java内使用"><a href="#二、java内使用" class="headerlink" title="二、java内使用"></a>二、java内使用</h2><blockquote>
<p>以线程Runnable和Thread之间的关系作类比</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></pre></td><td class="code"><pre><span class="line">> <span class="comment">/*创建线程的另一种方法是声明一个实现Runnable接口的类。 那个类然后实现了run方法。 然后可以分配类的实例，在创建Thread时作为参数传递，并启动。 这种其他风格的同一个例子如下所示： */</span></span><br><span class="line">> </span><br><span class="line">> </span><br><span class="line">> <span class="class"><span class="keyword">class</span> <span class="title">PrimeRun</span> <span class="keyword">implements</span> <span class="title">Runnable</span> </span>{</span><br><span class="line">> <span class="keyword">long</span> minPrime;</span><br><span class="line">> PrimeRun(<span class="keyword">long</span> minPrime) {</span><br><span class="line">> <span class="keyword">this</span>.minPrime = minPrime;</span><br><span class="line">> }</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">run</span><span class="params">()</span> </span>{</span><br><span class="line">> <span class="comment">// compute primes larger than minPrime</span></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><br><span class="line">> <span class="comment">/*然后，以下代码将创建一个线程并启动它运行：*/</span> </span><br><span class="line">> PrimeRun p = <span class="keyword">new</span> PrimeRun(<span class="number">143</span>);</span><br><span class="line">> <span class="keyword">new</span> Thread(p).start();</span><br><span class="line">> </span><br><span class="line">></span><br></pre></td></tr></table></figure>
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<h1 id="装饰器设计模式（Java）"><a href="#装饰器设计模式（Java）" class="headerlink" title="装饰器设计模式（Java）"></a>装饰器设计模式（Java）</h1><h2 id="一、组成示例"><a href="#一、组成示例" class="headerlink" title="一、组成示例"></a>一、组成示例</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><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></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">Decorate</span></span>{</span><br><span class="line"></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/*抽象组件*/</span></span><br><span class="line"><span class="class"><span class="keyword">interface</span> <span class="title">Drink</span></span>{</span><br><span class="line"> <span class="function"><span class="keyword">double</span> <span class="title">cost</span><span class="params">()</span></span>;</span><br><span class="line"> <span class="function">String <span class="title">info</span><span class="params">()</span></span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/*具体组件*/</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Coffee</span> <span class="keyword">implements</span> <span class="title">Drink</span></span>{</span><br><span class="line"> <span class="keyword">private</span> String name = <span class="string">"原味咖啡"</span>;</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">double</span> price = <span class="number">10.0</span>;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">double</span> <span class="title">cost</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> price;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">info</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> name;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/*抽象装饰类*/</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">DecorateClass</span> <span class="keyword">implements</span> <span class="title">Drink</span></span>{</span><br><span class="line"> <span class="keyword">private</span> Drink drink;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">DecorateClass</span><span class="params">(Drink drink)</span></span>{</span><br><span class="line"> <span class="keyword">this</span>.drink = drink;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">double</span> <span class="title">cost</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.drink.cost();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">info</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.drink.info();</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/*具体装饰类*/</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Milk</span> <span class="keyword">extends</span> <span class="title">DecorateClass</span></span>{</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Milk</span><span class="params">(Drink drink)</span> </span>{</span><br><span class="line"> <span class="keyword">super</span>(drink);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">double</span> <span class="title">cost</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">super</span>.cost()*<span class="number">4</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">info</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">super</span>.info() + <span class="string">"加奶！！"</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h2 id="二、Java内使用"><a href="#二、Java内使用" class="headerlink" title="二、Java内使用"></a>二、Java内使用</h2><blockquote>
<p>以I/O流为例</p>
<p>InputStream; -> 抽象组件<br>ByteArrayInputStream; -> 具体组件<br>FileInputStream; -> 具体组件<br>FilterInputStream; -> 抽象装饰类<br>BufferedInputStream; -> 具体装饰类</p>
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