+

java 24种设计模式 含代码 java 24种设计模式 含代码

                        RepTempRule{<br> <br> <br>
                        public void replace() throws Exception{ <br> <br>
                        　　newString=oldString.replaceFirst(&quot;aaa&quot;, &quot;ccc&quot;) 
                        <br>
                        　　System.out.println(&quot;this is replace Two&quot;);<br>
                        　　 <br>
                        }<br> <br> <br>
                        }</td>
                    </tr>
                  </table>
                  <p>第二步：我们要建立一个算法解决类，用来提供客户端可以自由选择算法。</p>
                  <table width="80%" border="1">
                    <tr>
                      <td bgcolor="#CCCCCC">public class RepTempRuleSolve { <p> 
                          　　private RepTempRule strategy;</p>
                        <p> 　　public RepTempRuleSolve(RepTempRule rule){<br>
                          　　　　this.strategy=rule;<br>
                          　　}</p>
                        <p> 　　public String getNewContext(Site site,String oldString) 
                          {<br>
                          　　　　return strategy.replace(site,oldString);<br>
                          　　}</p>
                        <p> 　　public void changeAlgorithm(RepTempRule newAlgorithm) 
                          {<br>
                          　　　　strategy = newAlgorithm;<br>
                          　　}</p>
                        <p>}</p></td>
                    </tr>
                  </table>
                  <p>&nbsp;</p>
                  <p>&nbsp;</p>
                  <p>调用如下:</p>
                  <table width="100%" border="0" cellspacing="3" cellpadding="3">
                    <tr> 
                      <td bgcolor="#CCCCCC"> <p>public class test{</p>
                        <p> ......</p>
                        <p>　　public void testReplace(){</p>
                        <p>　　//使用第一套替代方案<br>
                          　　RepTempRuleSolve solver=new RepTempRuleSolve(new RepTempRuleSimple());<br>
                          　　solver.getNewContext(site,context); </p>
                        <p>　　//使用第二套</p>
                        <p>　　solver=new RepTempRuleSolve(new RepTempRuleTwo());<br>
                          　　solver.getNewContext(site,context); </p>
                        <p></p>
                        <p>　　}</p>
                        <p>.....</p>
                        <p>}</p></td>
                    </tr>
                  </table>
                  <p>我们达到了在运行期间，可以自由切换算法的目的。</p>
                  <p>实际整个Strategy的核心部分就是抽象类的使用,使用Strategy模式可以在用户需要变化时,修改量很少,而且快速.</p>
                  <p>Strategy和Factory有一定的类似,Strategy相对简单容易理解,并且可以在运行时刻自由切换。Factory重点是用来创建对象。</p>
                  <p>Strategy适合下列场合:</p>
                  <p>1.以不同的格式保存文件;</p>
                  <p>2.以不同的算法压缩文件;</p>
                  <p>3.以不同的算法截获图象;</p>
                  <p>4.以不同的格式输出同样数据的图形,比如曲线 或框图bar等</p>
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