参考实例：
抽象工厂模式的缺点不太容易扩展新的产品
如果需要给整个产品族添加一个新的产品，那么就需要修改抽象工厂，这样就会导致修改所有的工厂实现类。
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工厂 其实就是抽象出事物的共性或者相似之处，定义共同的接口，实现交给具体的子类处理的过程。
理解 产品族和等级的概念：
1.抽象工厂：定义工厂接口，包含生产原味和草莓味的酸奶的方法；
2.定义工厂的实现类：蒙牛工厂和伊利工厂，并实现接口的方法；
3.抽象工厂：定义口味接口，包含原味接口和草莓味接口，每个接口包含该口味酸奶的价格的方法；
4.定义口味接口的实现类：每个工厂都能生产原味和草莓味酸奶，因此每个工厂分别包含原味接口的实现类和草莓味接口的实现类，实现类中给出该口味酸奶的价格。
5.顾客类：顾客购买酸奶，只要说明要买酸奶的厂家，既得到该厂家下不同口味酸奶的价格信息；
代码如下：
定义 草莓味接口：
package iv.factory.feidanyi.yuanshi.interfaces;public interface CaoMeiWei {void getPrice();}
定义草莓味的实现类：蒙牛草莓味
package iv.factory.feidanyi.yuanshi.classes;import iv.factory.feidanyi.yuanshi.interfaces.CaoMeiWei;public class MengNiuCmw implements CaoMeiWei {private int price =0;public MengNiuCmw(int price){this.price = price;}public void getPrice() {// TODO Auto-generated method stubSystem.out.println("蒙牛草莓味价格："+this.price);}}
定义草莓味的实现类：伊利草莓味
package iv.factory.feidanyi.yuanshi.classes;import iv.factory.feidanyi.yuanshi.interfaces.CaoMeiWei;public class YiLiCmw implements CaoMeiWei {private int price =0;public YiLiCmw(int price){this.price = price;}public void getPrice() {// TODO Auto-generated method stubSystem.out.println("伊利草莓味价格："+this.price);}}
定义原味接口：
package iv.factory.feidanyi.yuanshi.interfaces;public interface YuanWei {void getPrice();}
定义原味接口的实现类：蒙牛原味：
package iv.factory.feidanyi.yuanshi.classes;import iv.factory.feidanyi.yuanshi.interfaces.YuanWei;public class MengNiuYw implements YuanWei{private short price =0;private String brand ="";public MengNiuYw(int price){this.price = (short) price;}public void getPrice() {// TODO Auto-generated method stubSystem.out.println("原味价格："+this.price);}public void getBrand() {// TODO Auto-generated method stubSystem.out.println("品牌："+this.brand);}}
定义原味接口的实现类：伊利原味：
package iv.factory.feidanyi.yuanshi.classes;import iv.factory.feidanyi.yuanshi.interfaces.YuanWei;public class YiLiYw implements YuanWei{private int price =0;private String brand = "";public YiLiYw(int price){this.price = price;}public void getPrice() {// TODO Auto-generated method stubSystem.out.println("原味价格："+this.price);}}
定义厂家的接口：
package iv.factory.feidanyi.yuanshi.interfaces;public interface AbstractFactory {YuanWei createYuanWei();CaoMeiWei createCaoMeiWei();}
定义厂家的接口的实现类：蒙牛厂家：
package iv.factory.feidanyi.yuanshi.classes;import iv.factory.feidanyi.yuanshi.interfaces.AbstractBrandFactory;import iv.factory.feidanyi.yuanshi.interfaces.AbstractFactory;import iv.factory.feidanyi.yuanshi.interfaces.CaoMeiWei;import iv.factory.feidanyi.yuanshi.interfaces.YuanWei;public class MengNiuFactory implements AbstractFactory,AbstractBrandFactory {public CaoMeiWei createCaoMeiWei() {// TODO Auto-generated method stubreturn new MengNiuCmw(14);}public YuanWei createYuanWei() {// TODO Auto-generated method stubreturn new MengNiuYw(15);}public String getBrand() {// TODO Auto-generated method stubreturn new MengNiu().getBrand();}}
定义厂家的接口的实现类：伊利厂家：
package iv.factory.feidanyi.yuanshi.classes;import iv.factory.feidanyi.yuanshi.interfaces.AbstractBrandFactory;import iv.factory.feidanyi.yuanshi.interfaces.AbstractFactory;import iv.factory.feidanyi.yuanshi.interfaces.CaoMeiWei;import iv.factory.feidanyi.yuanshi.interfaces.YuanWei;public class YiLiFactory implements AbstractFactory,AbstractBrandFactory {public CaoMeiWei createCaoMeiWei() {// TODO Auto-generated method stubreturn new YiLiCmw(11);}public YuanWei createYuanWei() {// TODO Auto-generated method stubreturn new YiLiYw(12);}public String getBrand() {// TODO Auto-generated method stubreturn new YiLi().getBrand();}}
定义顾客类：
package iv.factory.feidanyi.yuanshi.classes;import iv.factory.feidanyi.yuanshi.interfaces.AbstractFactory;import iv.factory.feidanyi.yuanshi.interfaces.CaoMeiWei;import iv.factory.feidanyi.yuanshi.interfaces.YuanWei;public class Customer {private YuanWei yw =null;private CaoMeiWei cmw = null;public void buyMilk(AbstractFactory af){yw = af.createYuanWei();cmw = af.createCaoMeiWei();yw.getPrice();cmw.getPrice();}}在繁华中体会热闹;若是厌倦了喧嚣，寻一处宁静的幽谷，
