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java 24种设计模式 含代码 java 24种设计模式 含代码

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<p>//中杯<br>public class MediumCoffee extends Coffee<br>{<br>　　public MediumCoffee() {setCoffeeImp();}<br><br>　　public void pourCoffee()<br>　　{<br>　　　　CoffeeImp coffeeImp =
                 this.getCoffeeImp();<br>　　　　//我们以重复次数来说明是冲中杯还是大杯 ,重复2次是中杯<br>　　　　for (int i = 0; i &lt; 2; i++)<br>　　　　{<br><br>
                          　　　　　　coffeeImp.pourCoffeeImp();<br>
                          　　　　}<br>　　<br>　　}<br>}<br></p>
<p>//大杯<br>public class SuperSizeCoffee extends Coffee<br>{<br>　　public SuperSizeCoffee() {setCoffeeImp();}<br><br>　　public void pourCoffee()<br>　　{<br>　　　　CoffeeImp coffeeImp =
                 this.getCoffeeImp();<br>　　　　//我们以重复次数来说明是冲中杯还是大杯 ,重复5次是大杯<br>　　　　for (int i = 0; i &lt; 5; i++)<br>　　　　{<br><br>
                          　　　　　　coffeeImp.pourCoffeeImp();<br>
                          　　　　}<br>　　<br>　　}<br>}</p>
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<p>上面分别是中杯和大杯的具体实现.下面再对行为CoffeeImp进行继承:</p>
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<p>//加奶<br>public class MilkCoffeeImp extends CoffeeImp<br>{<br>　　MilkCoffeeImp() {}<br><br>　　public void pourCoffeeImp()<br>　　{<br>　　　　System.out.println("加了美味的牛奶");<br>　　}<br>}<br></p>
<p>//不加奶<br>public class FragrantCoffeeImp extends CoffeeImp<br>{<br>　　FragrantCoffeeImp() {}<br><br>　　public void pourCoffeeImp()<br>　　{<br>　　　　System.out.println("什么也没加,清香");<br>　　}<br>}</p>
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<p>Bridge模式的基本框架我们已经搭好了,别忘记定义中还有一句:动态结合,我们现在可以喝到至少四种咖啡:<br>1.中杯加奶<br>2.中杯不加奶<br>3.大杯加奶<br>4.大杯不加奶</p>
<p>看看是如何动态结合的,在使用之前,我们做个准备工作,设计一个单态类(Singleton)用来hold当前的CoffeeImp:</p>
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   			                                          			<td bgcolor="#cccccc">	public class CoffeeImpSingleton<br>{<br>　　private static CoffeeImp coffeeImp;<br><br>　　public CoffeeImpSingleton(CoffeeImp coffeeImpIn)<br>　　 {this.coffeeImp = coffeeImpIn;}<br><br>　　public static CoffeeImp getTheCoffeeImp()<br>　　{<br>　　　　return coffeeImp;<br>　　}<br>}<br>
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<p>看看中杯加奶 和大杯加奶 是怎么出来的:</p>
<p>//拿出牛奶<br>CoffeeImpSingleton coffeeImpSingleton = new CoffeeImpSingleton(new MilkCoffeeImp());<br><br>//中杯加奶<br>MediumCoffee mediumCoffee = new MediumCoffee();<br>mediumCoffee.pourCoffee();<br><br>//大杯加奶<br>SuperSizeCoffee superSizeCoffee = new SuperSizeCoffee();<br>superSizeCoffee.pourCoffee();</p>
<p>注意: Bridge模式的执行类如CoffeeImp和Coffee是一对一的关系, 正确创建CoffeeImp是该模式的关键,</p>
<p align="left">   			                                                        Bridge模式在EJB中的应用<br>EJB中有一个Data Access Object (DAO)模式,这是将商业逻辑和具体数据资源分开的,因为不同的数据库有不同的数据库操作.将操作不同数据库的行为独立抽象成一个行为接口DAO.如下:</p>
<p>1.Business Object (类似Coffee)</p>
<p>实现一些抽象的商业操作:如寻找一个用户下所有的订单</p>
<p>涉及数据库操作都使用DAOImplementor.</p>
<p>2.Data Access Object (类似CoffeeImp)</p>
<p>一些抽象的对数据库资源操作</p>
<p>3.DAOImplementor 如OrderDAOCS, OrderDAOOracle, OrderDAOSybase(类似MilkCoffeeImp 
        FragrantCoffeeImp)</p>
<p>具体的数据库操作,如"INSERT INTO "等语句,OrderDAOOracle是Oracle OrderDAOSybase是Sybase数据库.</p>
<p>4.数据库 (Cloudscape, Oracle, or Sybase database via JDBC API)</p>
<p><br></p>
<p>设计模式如何在具体项目中应用见<a href="../mybook/index.htm" target="_blank">《Java实用系统开发指南》</a></p>
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