简单工厂模式

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去麦当劳吃东西，麦当劳为工厂，提供milk和mcchichen食物。

public interface Food {public void getFood();}

mcchicken代码

package simplefactory;public class McChicken implements Food {public void getFood() {<span style="white-space:pre"></span>System.out.println("Get a Chicken!");<span style="white-space:pre"></span>}}

Milk：

package simplefactory;public class Milk implements Food {public void getFood() {<span style="white-space:pre"></span>System.out.println("Get Milk!");<span style="white-space:pre"></span>}}

工厂麦当劳

package simplefactory;public class McDlz {<span style="white-space:pre"></span>public static Food getFood(String type) throws<span style="white-space:pre"></span>InstantiationException,IllegalAccessException,ClassNotFoundException{<span style="white-space:pre"></span>if(type.equalsIgnoreCase("mcchicken")){<span style="white-space:pre"></span>return (Food)McChicken.class.newInstance();<span style="white-space:pre"></span>}else if(type.equalsIgnoreCase("milk")){<span style="white-space:pre"></span>return (Food)Milk.class.newInstance();<span style="white-space:pre"></span>}else{<span style="white-space:pre"></span>System.out.println("Can't find this food!");<span style="white-space:pre"></span>return null;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>}}

测试客户端：

package simplefactory;public class SimpleFactory {<span style="white-space:pre"></span>/**<span style="white-space:pre"></span> * @param args<span style="white-space:pre"></span> * @throws ClassNotFoundException <span style="white-space:pre"></span> * @throws IllegalAccessException <span style="white-space:pre"></span> * @throws InstantiationException <span style="white-space:pre"></span>*/<span style="white-space:pre"></span>public static void main(String[] args) throws InstantiationException, IllegalAccessException, ClassNotFoundException {<span style="white-space:pre"></span>Food mcChicken = McDlz.getFood("mcchicken");<span style="white-space:pre"></span>Food milk = McDlz.getFood("milk");<span style="white-space:pre"></span><span style="white-space:pre"></span>if(mcChicken != null){<span style="white-space:pre"></span>mcChicken.getFood();<span style="white-space:pre"></span>}<span style="white-space:pre"></span>if(milk != null){<span style="white-space:pre"></span>milk.getFood();<span style="white-space:pre"></span>}<span style="white-space:pre"></span>}}

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