程序的UML图和代码：
（1）先创建一个食品工厂接口IFoodFactory
public interface IFoodFactory { public Burger MakeBurger(); public Chicken MakeChicken(); public Drink MakeDrink(); }
（2）由于两家店都有汉堡、炸鸡和饮料，因此创建一个食品接口IFood，里面有做食物的方法
public interface IFood
{ public abstract void Make(); }
（3）设置各个食物的接口
汉堡Burger的IFood食物接口
abstract class Burger implements IFood { public void Make() { } }
炸鸡Chicken的IFood食物接口
abstract class Chicken implements IFood { public void Make() { } }
饮料Drink的IFood食物接口
abstract class Drink implements IFood { public void Make() { } }
（4）继承Burger来生产肯德基和麦当劳的汉堡
public class KFCBurger extends Burger { public void Make() { System.out.println("This is KFC‘s Burger!"); } }
public class McDonaldBurger extends Burger { public void Make() { System.out.println("This is McDonal‘s Burger!"); } }
（5）继承Chicken来生产肯德基和麦当劳的炸鸡
public class KFCChicken extends Chicken { public void Make() { System.out.println("This is KFC‘s Chicken!"); } }
public class McDonaldChicken extends Chicken { public void Make() { System.out.println("This is McDonald‘s Chicken!"); } }
（6）继承Drink来生产肯德基和麦当劳的饮料
public class KFCDrink extends Drink { public void Make() { System.out.println("This is KFC‘s Drink!"); } }
public class McDonaldDrink extends Drink { public void Make() { System.out.println("This is McDonald‘s Drink!"); } }
（7）肯德基和麦当劳 分别实现食品工厂的接口
KFC：
public class KFCFactory implements IFoodFactory { public Burger MakeBurger() { return new KFCBurger(); } public Chicken MakeChicken() { return new KFCChicken(); } public Drink MakeDrink() { return new KFCDrink(); } }
McDonald‘s：
public class McDonaldFactory implements IFoodFactory { public McDonaldBurger MakeBurger() { return new McDonaldBurger(); } public McDonaldChicken MakeChicken() { return new McDonaldChicken(); } public McDonaldDrink MakeDrink() { return new McDonaldDrink(); } }
（8）主函数Main分别创建KFC和McDonald‘s的实例，制作各自的汉堡、炸鸡、饮料。
显示结果如下：
原文：http://www.cnblogs.com/stoneblogs/p/5090255.html