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
炸鸡Chicken的IFood食物接口
饮料Drink的IFood食物接口
abstract class Burger implements IFood { public void Make() { } }
abstract class Burger implements IFood { public void Make() { } } abstract class Chicken 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,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!"); } } //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：
原文：http://www.cnblogs.com/gzy1031/p/5090388.html