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JAVA状态机
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<h2 id="1-引子"><a href="#1-引子" class="headerlink" title="1. 引子"></a>1. 引子</h2><p>空调(air-condition)的遥控器有两个按钮(更多的按钮奋斗在后面的例子中引入)，power/电源键和cool/制冷键。空调的运行呈现3个状态，停止/Off、仅送风/FanOnly、制冷/Cool。起始状态为Off，状态变化图如下所示。</p>
<p><img src="http://www.plantuml.com/plantuml/svg/YzQALT0jBT2rKt3BB2ekuGAJ2hf5cUaP9K31uDJa_BmKBWYbe0iK2Sd8B4hX0fCAkZcfQI1LFed59G00"></p>
<p>这是简化的有限状态机(Finite State Machine、FSM或者Finite State Automata)图形，使用了状态图的3个元素：①气泡，表示状态(state)；②连接状态的箭头表示转换（transition）；③箭头上的标记前者为事件(event)。</p>
<p>状态的转换，看图说话。按power键，则Off→FanOnly、Cool→Off等；按cool，则Off→Off (没有画出来，喜欢全面一点就自己画吧)。<br>对于这种简单的状态的转换，yqj2065还是喜欢分支语句。微笑，简洁明快。</p>
<figure class="highlight plain"><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><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div></pre></td><td class="code"><pre><div class="line">package property.state.stateMachine; </div><div class="line">import static tool.Print.*;//pln </div><div class="line">/** </div><div class="line"> * 空调Aircon。简单的模型： </div><div class="line"> * 遥控器有两个按钮(更多的按钮在下面的例子中引入)，power电源键和cool制冷键。 </div><div class="line"> * 空调的运行呈现3个状态，停止/Off、仅送风/FanOnly、制冷/Cool。 </div><div class="line"> * 起始状态为Off </div><div class="line"> * @author (yqj2065) </div><div class="line"> * @version 0.1 </div><div class="line"> */ </div><div class="line">public class Aircon0{ </div><div class="line"> // off，FanOnly，AC </div><div class="line"> private int state=0;//起始状态为Off </div><div class="line"> public int getState(){return state;} </div><div class="line"> //两个Action </div><div class="line"> public void power(){//按power键 </div><div class="line"> if(state==0){//off </div><div class="line"> state=1; </div><div class="line"> pln("start Fan"); </div><div class="line"> }else if(state==1){//FanOnly </div><div class="line"> state=0; </div><div class="line"> pln("stop Fan"); </div><div class="line"> }else{ </div><div class="line"> state=0; </div><div class="line"> pln("stop Cool"); </div><div class="line"> } </div><div class="line"> } </div><div class="line"> </div><div class="line"> public void cool(){//按制冷键 </div><div class="line"> if(state==0){//off </div><div class="line"> pln("nothing"); </div><div class="line"> }else if(state==1){//FanOnly </div><div class="line"> state=2; </div><div class="line"> pln("start Cool"); </div><div class="line"> }else{ </div><div class="line"> state=1; </div><div class="line"> pln("stop Cool"); </div><div class="line"> } </div><div class="line"> } </div><div class="line">} </div><div class="line">package property.state.stateMachine; </div><div class="line">public class ACCtrl{ </div><div class="line"> public static void test(){ </div><div class="line"> Aircon0 ac = new Aircon0();//power() cool() </div><div class="line"> System.out.println("Current State:" + ac.getState()); </div><div class="line"> ac.cool(); </div><div class="line"> ac.power(); </div><div class="line"> ac.cool(); </div><div class="line"> ac.cool(); </div><div class="line"> ac.power(); </div><div class="line"> ac.power(); </div><div class="line"> } </div><div class="line">}</div></pre></td></tr></table></figure>
<p>测试代码的输出：<br>Current State:0<br>nothing<br>start Fan<br>start Cool<br>stop Cool<br>stop Fan<br>start Fan<br>在此基础上，可以花10分钟练习一下，采用状态模式修改上述代码。我们使用enum编写状态类层次。其结构如下：</p>
<figure class="highlight plain"><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></pre></td><td class="code"><pre><div class="line">例程 4 6 enum State </div><div class="line"> </div><div class="line">enum State0{ </div><div class="line"> OFF{ </div><div class="line"> @Override void power(){ </div><div class="line"> } </div><div class="line"> @Override void power(){ </div><div class="line"> } </div><div class="line"> },FANONLY{ </div><div class="line"> }, </div><div class="line"> COOL{ }; </div><div class="line"> public abstract void power(); </div><div class="line"> public abstract void cool(); </div><div class="line">}</div></pre></td></tr></table></figure>
<p>(本来是应该将State1作为Aircon1的内部类的。放在外边，power()等需要添加参数Aircon1，变为power(Aircon1 ac)).<br>现在，丰富有限状态机的细节，增添④动作(action)，如事件(event)相应的动作和状态的动作。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line"></div><div class="line"></div></pre></td></tr></table></figure>
<p>为此，在enum State1中，除了状态模式 提取的接口外，添加了状态机的各种动作/action methode<br> void entry(Aircon1 ac){pln(“→”+ac.state.name());}<br> void exit(Aircon1 ac){p(ac.state.name()+”→ “);}<br> void startCool(){ p(“start Cool”); }<br> void stopCool(){ p(“stop Cool”); }<br> void startFan(){ p(“start Fan”); }<br> void stopFan(){ p(“stop Fan”); }<br>每个power(Aircon1 ac)、cool(Aircon1 ac)的方法体结构都是：<br> this.exit(ac);<br> //如果有的话，事件(event)相应的动作，如stopFan();<br> ac.state =OFF; //下一个状态<br> ac.state.entry(ac);<br><figure class="highlight plain"><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><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div></pre></td><td class="code"><pre><div class="line">package property.state.stateMachine; </div><div class="line">import static tool.Print.*;//pln </div><div class="line">/** </div><div class="line"> * 本来是应该将State1作为Aircon1的内部类的。现在放在外边， </div><div class="line"> * power()等需要变为power(Aircon1 ac) </div><div class="line"> */ </div><div class="line">public enum State1{ </div><div class="line"> OFF{ </div><div class="line"> @Override void exit(Aircon1 ac){super.exit(ac);startFan();} </div><div class="line"> @Override void power(Aircon1 ac){ </div><div class="line"> this.exit(ac); </div><div class="line"> ac.state =FANONLY; </div><div class="line"> ac.state.entry(ac); </div><div class="line"> } </div><div class="line"> @Override void cool(Aircon1 ac){ </div><div class="line"> pln("nothing"); </div><div class="line"> } </div><div class="line"> },FANONLY{ </div><div class="line"> @Override void power(Aircon1 ac){ </div><div class="line"> this.exit(ac); </div><div class="line"> stopFan(); </div><div class="line"> ac.state =OFF; </div><div class="line"> ac.state.entry(ac); </div><div class="line"> } </div><div class="line"> @Override void cool(Aircon1 ac){ </div><div class="line"> this.exit(ac); </div><div class="line"> ac.state =COOL; </div><div class="line"> ac.state.entry(ac); </div><div class="line"> } </div><div class="line"> }, </div><div class="line"> COOL{ </div><div class="line"> @Override void exit(Aircon1 ac){super.exit(ac);stopCool();} </div><div class="line"> @Override void entry(Aircon1 ac){startCool();super.entry(ac);} </div><div class="line"> @Override void power(Aircon1 ac){ </div><div class="line"> this.exit(ac); </div><div class="line"> stopFan(); </div><div class="line"> ac.state =OFF; </div><div class="line"> ac.state.entry(ac); </div><div class="line"> } </div><div class="line"> @Override void cool(Aircon1 ac){ </div><div class="line"> this.exit(ac); </div><div class="line"> ac.state =FANONLY; </div><div class="line"> ac.state.entry(ac); </div><div class="line"> } </div><div class="line"> }; </div><div class="line"> //状态模式 提取的接口 </div><div class="line"> abstract void power(Aircon1 ac); </div><div class="line"> abstract void cool(Aircon1 ac); </div><div class="line"> //状态机的各种动作action methode </div><div class="line"> void entry(Aircon1 ac){pln("→"+ac.state.name());} </div><div class="line"> void exit(Aircon1 ac){p(ac.state.name()+"→ ");} </div><div class="line"> void startCool(){ p("start Cool"); } </div><div class="line"> void stopCool(){ p("stop Cool"); } </div><div class="line"> void startFan(){ p("start Fan"); } </div><div class="line"> void stopFan(){ p("stop Fan"); } </div><div class="line">}</div></pre></td></tr></table></figure></p>
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<p>Welcome to <a href="https://hexo.io/" target="_blank" rel="external">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="external">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="external">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="external">GitHub</a>.</p>
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