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<title>设计模式之Prototype 原型模式
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<h3 align="center">设计模式之Prototype(原型)</h3>
<p align="center"><a href="http://www.jdon.com/aboutme.htm">板桥里人</a> http://www.jdon.com 2002/05/07</p>
<p align="center"><a href="../mybook/index.htm" target="_blank"><strong>模式实战书籍《Java实用系统开发指南》</strong></a></p>
<p>原型模式定义:<br>
用原型实例指定创建对象的种类,并且通过拷贝这些原型创建新的对象.</p>
<p>Prototype模式允许一个对象再创建另外一个可定制的对象，根本无需知道任何如何创建的细节,工作原理是:通过将一个原型对象传给那个要发动创建的对象，这个要发动创建的对象通过请求原型对象拷贝它们自己来实施创建。</p>
<p>如何使用?<br>
因为Java中的提供clone()方法来实现对象的克隆,所以Prototype模式实现一下子变得很简单.</p>
<p>以勺子为例：</p>
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<tr>
<td bgcolor="#CCCCCC">public abstract class AbstractSpoon
implements Cloneable<br>
{ <br>
String spoonName; <br> <br>
public void setSpoonName(String spoonName) {this.spoonName
= spoonName;}<br>
public String getSpoonName() {return this.spoonName;}<br>
<br>
public Object clone() <br>
{<br>
Object object = null;<br>
try {<br>
object = super.clone();<br>
} catch (CloneNotSupportedException exception) {<br>
System.err.println("AbstractSpoon is not Cloneable");<br>
}<br>
return object;<br>
}<br>
}<br> </td>
</tr>
</table>
<p>有个具体实现(ConcretePrototype):</p>
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<td bgcolor="#CCCCCC"> <p>public class SoupSpoon extends
AbstractSpoon<br>
{ <br>
public SoupSpoon()<br>
{<br>
setSpoonName("Soup Spoon"); <br>
}<br>
}<br>
</p>
<p> </p></td>
</tr>
</table>
<p>调用Prototype模式很简单:</p>
<p>AbstractSpoon spoon = new SoupSpoon();<br>
AbstractSpoon spoon2 = spoon.clone(); </p>
<p>当然也可以结合工厂模式来创建AbstractSpoon实例。</p>
<p>在Java中Prototype模式变成clone()方法的使用，由于Java的纯洁的面向对象特性，使得在Java中使用设计模式变得很自然，两者已经几乎是浑然一体了。这反映在很多模式上，如Interator遍历模式。</p>
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