设计模式之四：工厂方法模式(披萨店生产披萨模拟流程)

工厂方法模式：定义了一个创建对象的接口，但由子类决定要实例化的类是哪一个。工厂方法让类把实例化推迟到子类。(披萨店生产披萨模拟流程)

工厂方法模式通过让子类决定该创建的对象是什么，来达到将对象的过程封装的目地。

简单工厂和工厂方法之间的差异：

1）简单工厂不是一个设计模式，常被误认为是“工厂模式”。

2）简单工厂把全部的事情，在一个地方都处理完了，然而工厂方法却是创建一个框架，让子类决定要如何实现。

3）简单工厂的做法，可以将对象的创建封装起来，但是简单工厂具备工厂方法的弹性，因为简单工厂不能变更正在创建的产品。

工程名称：Factory 下载目录：http://www.cnblogs.com/jrsmith/admin/Files.aspx ，Factory.zip

 1 package com.jyu.store;
 2 
 3 import com.jyu.pizza.Pizza;
 4 
 5 /**
 6  * 抽象 批萨店 类
 7  * @author root
 8  *
 9  */
10 public abstract class PizzaStore {
11 
12     public Pizza orderPizza(String type){
13         Pizza pizza;
14         
15         pizza = createPizza(type);
16         
17         pizza.prepare();
18         pizza.bake();
19         pizza.cut();
20         pizza.box();
21         
22         return pizza;
23     }
24     
25     /**
26      * 生产具体类型批萨工厂
27      * @param type
28      * @return
29      */
30     public abstract Pizza createPizza(String type);
31 }

View Code

 1 package com.jyu.newyostore;
 2 
 3 import com.jyu.newyopizza.NYStyleCheesePizza;
 4 import com.jyu.newyopizza.NYStyleClamPizza;
 5 import com.jyu.newyopizza.NYStylePepperoniPizza;
 6 import com.jyu.newyopizza.NYStyleVeggiePizza;
 7 import com.jyu.pizza.Pizza;
 8 import com.jyu.store.PizzaStore;
 9 
10 /**
11  * 纽约批萨店
12  * @author root
13  *
14  */
15 public class NYPizzaStore extends PizzaStore {
16 
17     @Override
18     public Pizza createPizza(String type) {
19         
20         if(type.equals("cheese")){
21             return new NYStyleCheesePizza();
22         }else if(type.equals("veggie")){
23             return new NYStyleVeggiePizza();
24         }else if(type.equals("clam")){
25             return new NYStyleClamPizza();
26         }else if(type.equals("pepperoni")){
27             return new NYStylePepperoniPizza();
28         }else{
29             return null;
30         }
31     }
32 
33 }

View Code

 1 package com.jyu.chigagostore;
 2 
 3 import com.jyu.chigagopizza.ChicagoStyleCheesePizza;
 4 import com.jyu.chigagopizza.ChicagoStyleVeggiePizza;
 5 import com.jyu.pizza.Pizza;
 6 import com.jyu.store.PizzaStore;
 7 
 8 /**
 9  * 芝加哥批萨店
10  * @author root
11  *
12  */
13 public class CGPizzaStore extends PizzaStore {
14 
15     @Override
16     public Pizza createPizza(String type) {
17         
18         if(type.equals("cheese")){
19             return new ChicagoStyleCheesePizza();
20         }else if(type.equals("veggie")){
21             return new ChicagoStyleVeggiePizza();
22         }else{
23             return null;
24         }
25     }
26 
27 }

 1 package com.jyu.pizza;
 2 
 3 import java.util.ArrayList;
 4 
 5 /**
 6  * 抽象 批萨类
 7  * @author root
 8  *
 9  */
10 public abstract class Pizza {
11 
12     protected String name;
13     protected String dough;
14     protected String sauce;
15     protected ArrayList toppings = new ArrayList();
16     
17     /**
18      * 基本做法：烘烤，切片，装盒
19      */
20     public void prepare(){
21         System.out.println("Preparing " + name);
22         System.out.println("Tossin dough...");
23         System.out.println("Adding sauce..");
24         System.out.println("Adding toppings: ");
25         for(int i = 0; i < toppings.size(); i++){
26             System.out.println("  " + toppings.get(i));
27         }
28     }
29     
30     public void bake(){
31         System.out.println("Bake for 25 minutes at 350");
32     }
33     
34     public void cut(){
35         System.out.println("Cutting the pizza into diagonal slices");
36     }
37     
38     public void box(){
39         System.out.println("Place pizza in offical PizzaStore box");
40     }
41     
42     public String getName(){
43         return name;
44     }
45 }

View Code

 1 package com.jyu.newyopizza;
 2 
 3 import com.jyu.pizza.Pizza;
 4 
 5 /**
 6  * 纽约Cheese批萨
 7  * @author root
 8  *
 9  */
10 public class NYStyleCheesePizza extends Pizza {
11     
12     @SuppressWarnings("unchecked")
13     public NYStyleCheesePizza(){
14         name = "NY Style Sauce and Cheese Pizza";
15         dough = "Thin Crust Dough";
16         sauce = "Marinara Sauce";
17         
18         toppings.add("Grated Reggiano Cheese");
19     }
20 }

View Code

 1 package com.jyu.newyopizza;
 2 
 3 import com.jyu.pizza.Pizza;
 4 
 5 /**
 6  * 纽约Clam批萨
 7  * @author root
 8  *
 9  */
10 public class NYStyleClamPizza extends Pizza {
11     
12     @SuppressWarnings("unchecked")
13     public NYStyleClamPizza(){
14         name = "NY Style ClamPizza";
15         dough = "NYStyleClamPizza Dough";
16         sauce = "NYStyleClamPizza Sauce";
17         
18         toppings.add("Grated Reggiano Clam");
19     }
20 }

View Code

 1 package com.jyu.newyopizza;
 2 
 3 import com.jyu.pizza.Pizza;
 4 
 5 /**
 6  * 纽约Pepperoni批萨
 7  * @author root
 8  *
 9  */
10 public class NYStylePepperoniPizza extends Pizza {
11     
12     @SuppressWarnings("unchecked")
13     public NYStylePepperoniPizza(){
14         name = "NY Style Pepperoni";
15         dough = "NYStylePepperoniPizza Dough";
16         sauce = "NYStylePepperoniPizza Sauce";
17         
18         toppings.add("Grated Reggiano Pepperoni");
19     }
20 }

View Code

 1 package com.jyu.newyopizza;
 2 
 3 import com.jyu.pizza.Pizza;
 4 
 5 /**
 6  * 纽约Veggie批萨
 7  * @author root
 8  *
 9  */
10 public class NYStyleVeggiePizza extends Pizza {
11     
12     @SuppressWarnings("unchecked")
13     public NYStyleVeggiePizza(){
14         name = "NY Style VeggiePizza";
15         dough = "NYStyleVeggiePizza Dough";
16         sauce = "NYStyleVeggiePizza Sauce";
17         
18         toppings.add("Grated Reggiano Veggie");
19     }
20 }

View Code

 1 package com.jyu.chigagopizza;
 2 
 3 import com.jyu.pizza.Pizza;
 4 
 5 /**
 6  * 芝加哥Cheese批萨
 7  * @author root
 8  *
 9  */
10 public class ChicagoStyleCheesePizza extends Pizza {
11     
12     @SuppressWarnings("unchecked")
13     public ChicagoStyleCheesePizza(){
14         name = "Chicago Style Sauce and Cheese Pizza";
15         dough = "Extra Thick Crust Dough";
16         sauce = "Plum Tomato Sauce";
17         
18         toppings.add("Shredded Mozzarella Cheese");
19     }
20     
21     @Override
22     public void cut(){
23         System.out.println("Cutting the pizza into square slices");
24     }
25     
26 }

View Code

 1 package com.jyu.chigagopizza;
 2 
 3 import com.jyu.pizza.Pizza;
 4 
 5 /**
 6  * 芝加哥Veggie批萨
 7  * @author root
 8  *
 9  */
10 public class ChicagoStyleVeggiePizza extends Pizza {
11     
12     @SuppressWarnings("unchecked")
13     public ChicagoStyleVeggiePizza(){
14         name = "Chicago Style VeggiePizza";
15         dough = "ChicagoStyleVeggiePizza Dough";
16         sauce = "ChicagoStyleVeggiePizza Sauce";
17         
18         toppings.add("Shredded Mozzarella Veggie");
19     }
20     
21     @Override
22     public void cut(){
23         System.out.println("Cutting the pizza into square slices");
24     }
25     
26 }

 1 package com.jyu.test;
 2 
 3 import com.jyu.chigagostore.CGPizzaStore;
 4 import com.jyu.newyostore.NYPizzaStore;
 5 import com.jyu.pizza.Pizza;
 6 import com.jyu.store.PizzaStore;
 7 
 8 public class PizzaTestDrive {
 9 
10     /**
11      * @param args
12      */
13     public static void main(String[] args) {
14 
15         PizzaStore nyStore = new NYPizzaStore();
16         PizzaStore chicagoStroe = new CGPizzaStore();
17         
18         Pizza pizza = nyStore.orderPizza("cheese");
19         System.out.println("Ethan ordered a " + pizza.getName() + "\n");
20         
21         pizza = chicagoStroe.orderPizza("cheese");
22         System.out.println("Joel ordered a " + pizza.getName() + "\n");
23     }
24 
25 }

posted @ 2012-09-17 15:48 黄辉杰阅读(1537) 评论(0) 编辑收藏举报

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设计模式之四：工厂方法模式(披萨店生产披萨模拟流程)

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