设计模式—建造者模式

1.    public class Meal {  
2.        private String food;  
3.        private String drink;  
4.      
5.        public String getFood() {  
6.            return food;  
7.        }  
8.      
9.        public void setFood(String food) {  
10.            this.food = food;  
11.        }  
12.      
13.        public String getDrink() {  
14.            return drink;  
15.        }  
16.      
17.        public void setDrink(String drink) {  
18.            this.drink = drink;  
19.        }  
20.    }  


1.    public abstract class MealBuilder {  
2.        Meal meal = new Meal();  
3.          
4.        public abstract void buildFood();  
5.          
6.        public abstract void buildDrink();  
7.          
8.        public Meal getMeal(){  
9.            return meal;  
10.        }  
11.    } 

1.    public class MealA extends MealBuilder{  
2.      
3.        public void buildDrink() {  
4.            meal.setDrink("一杯可乐");  
5.        }  
6.      
7.        public void buildFood() {  
8.            meal.setFood("一盒薯条");  
9.        }  
10.      
11.    }  

1.    public class MealB extends MealBuilder{  
2.      
3.        public void buildDrink() {  
4.            meal.setDrink("一杯柠檬果汁");  
5.        }  
6.      
7.        public void buildFood() {  
8.            meal.setFood("三个鸡翅");  
9.        }  
10.      
11.    } 

1.    public class KFCWaiter {  
2.        private MealBuilder mealBuilder;  
3.          
4.        public void setMealBuilder(MealBuilder mealBuilder) {  
5.            this.mealBuilder = mealBuilder;  
6.        }  
7.      
8.        public Meal construct(){  
9.            //准备食物  
10.            mealBuilder.buildFood();  
11.            //准备饮料  
12.            mealBuilder.buildDrink();  
13.              
14.            //准备完毕，返回一个完整的套餐给客户  
15.            return mealBuilder.getMeal();  
16.        }  
17.    }

1.    public class Client {  
2.        public static void main(String[] args) {  
3.            //服务员  
4.            KFCWaiter waiter = new KFCWaiter();  
5.            //套餐A  
6.            MealA a = new MealA();  
7.            //服务员准备套餐A  
8.            waiter.setMealBuilder(a);  
9.            //获得套餐  
10.            Meal mealA = waiter.construct();  
11.              
12.            System.out.print("套餐A的组成部分:");  
13.            System.out.println(mealA.getFood()+"---"+mealA.getDrink());  
14.        }  
15.    }