Java设计模式：抽象工厂模式（Abstract Factroy Pattern）

抽象工厂模式定义

抽象工厂模式提供一个接口，用于创建相关或依赖对象的家族，而不需要明确指定具体类。

样例

上次的工厂方法模式使用的是披萨店的例子，为的是解决在各个不同的地区开的分店会做不同类型的披萨；

现在防止分店使用低价原料增加利润，损坏品牌，要确保每家店使用高质量的原料，所以打算使用生产原料的工厂；

但问题是每家分站使用的配料有可能不一样，如纽约的蛤蜊是新鲜的， 芝加哥的蛤蜊是冰冻的。

UML类图

注意由于太多，类图中的原料少画了2种：Pepperoni 与 Veggie，不影响大局。

代码

Dough.java

package com.jing.factory.abs;public interface Dough {public String toString();}

DoughChicago.java

package com.jing.factory.abs;public class DoughChicago implements Dough {public String toString(){return "Chicago Style Dough";}}

DoughNY.java

package com.jing.factory.abs;public class DoughNY implements Dough {public String toString(){return "NY Style Dough";}}

Sauce.java

package com.jing.factory.abs;public interface Sauce {public String toString();}

SauceChicago.java

package com.jing.factory.abs;public class SauceChicago implements Sauce {public String toString(){return "Chicago Style Sauce";}}

SauceNY.java

package com.jing.factory.abs;public class SauceNY implements Sauce {public String toString(){return "NY Style Sauce";}}

Cheese.java

package com.jing.factory.abs;public interface Cheese {public String toString();}

CheeseChicago.java

package com.jing.factory.abs;public class CheeseChicago implements Cheese {public String toString(){return "Chicago Style Cheese";}}

CheeseNY.java

package com.jing.factory.abs;public class CheeseNY implements Cheese {public String toString(){return "NY Style Cheese";}}

Clams.java

package com.jing.factory.abs;public interface Clams {public String toString();}

ClamsChicago.java

package com.jing.factory.abs;public class ClamsChicago implements Clams {public String toString(){return "Chicago Style Clams";}}

ClamsNY.java

package com.jing.factory.abs;public class ClamsNY implements Clams {public String toString(){return "NY Style Clams";}}

Pepperoni.java

package com.jing.factory.abs;public interface Pepperoni {public String toString();}

PepperoniChicago.java

package com.jing.factory.abs;public class PepperoniChicago implements Pepperoni {public String toString(){return "Chicago Style Pepperoni";}}

PepperoniNY.java

package com.jing.factory.abs;public class PepperoniNY implements Pepperoni {public String toString(){return "NY Style Pepperoni";}}

Veggies.java

package com.jing.factory.abs;public interface Veggies {public String toString();}

VeggiesGarlic.java

package com.jing.factory.abs;public class VeggiesGarlic implements Veggies {public String toString(){return "Veggies Garlic";}}

VeggiesMushroom.java

package com.jing.factory.abs;public class VeggiesMushroom implements Veggies {public String toString(){return "Veggies Mushroom";}}

VeggiesOlives.java

package com.jing.factory.abs;public class VeggiesOlives implements Veggies {public String toString(){return "Veggies Olives";}}

VeggiesOnion.java

package com.jing.factory.abs;public class VeggiesOnion implements Veggies {public String toString(){return "Veggies Onion";}}

VeggiesRedPepper.java

package com.jing.factory.abs;public class VeggiesRedPepper implements Veggies {public String toString(){return "Veggies Red Pepper";}}

PizzaIngredientFactory.java

package com.jing.factory.abs;public interface PizzaIngredientFactory {public Dough createDough();public Sauce createSauce();public Cheese createCheese();public Veggies[] createVeggies();public Pepperoni createPepperoni();public Clams createClam();}

PizzaIngredientFactoryChicago.java

package com.jing.factory.abs;public class PizzaIngredientFactoryChicago implements PizzaIngredientFactory {public Dough createDough() {// TODO Auto-generated method stubreturn new DoughChicago();}public Sauce createSauce() {// TODO Auto-generated method stubreturn new SauceChicago();}public Cheese createCheese() {// TODO Auto-generated method stubreturn new CheeseChicago();}public Veggies[] createVeggies() {// TODO Auto-generated method stubVeggies veggies[] = {new VeggiesOlives(),new VeggiesMushroom(),new VeggiesOnion()};return veggies;}public Pepperoni createPepperoni() {// TODO Auto-generated method stubreturn new PepperoniChicago();}public Clams createClam() {// TODO Auto-generated method stubreturn new ClamsChicago();}}

PizzaIngredientFactoryNY.java

package com.jing.factory.abs;public class PizzaIngredientFactoryNY implements PizzaIngredientFactory {public Dough createDough() {// TODO Auto-generated method stubreturn new DoughNY();}public Sauce createSauce() {// TODO Auto-generated method stubreturn new SauceNY();}public Cheese createCheese() {// TODO Auto-generated method stubreturn new CheeseNY();}public Veggies[] createVeggies() {// TODO Auto-generated method stubVeggies veggies[] = {new VeggiesGarlic(),new VeggiesRedPepper(),new VeggiesMushroom()};return veggies;}public Pepperoni createPepperoni() {// TODO Auto-generated method stubreturn new PepperoniNY();}public Clams createClam() {// TODO Auto-generated method stubreturn null;}}

现在开始我们的披萨类

Pizza.java

package com.jing.factory.abs;public abstract class Pizza {protected String name;Dough dough;Sauce sauce;Veggies veggies[];Cheese cheese;Pepperoni pepperoni;Clams clam;abstract void prepare();void bake(){System.out.println("Bake for 25 minutes at 350");}void cut(){System.out.println("Cutting the pizza into diagonal slices");}void box(){System.out.println("Place pizza in offical PizzaStore box");}void setName(String name){this.name = name;}String getName(){return name;}public String toString(){StringBuffer result = new StringBuffer();result.append("----- " +name +" --------- " + "\n");if (dough != null){result.append(dough);result.append("\n");}if (sauce != null){result.append(sauce);result.append("\n");}if (cheese != null) {result.append(cheese);result.append("\n");}if (veggies != null){for (int i = 0; i < veggies.length; i++){result.append(veggies[i]);if (i < veggies.length - 1){result.append(", ");}}result.append("\n");}if (clam != null){result.append(clam);result.append("\n");}if (pepperoni != null){result.append(pepperoni);result.append("\n");}return result.toString();}}

Pizza_Cheese.java

package com.jing.factory.abs;public class Pizza_Cheese extends Pizza {PizzaIngredientFactory ingredientFactory;public Pizza_Cheese(PizzaIngredientFactory ingredientFactory){this.ingredientFactory = ingredientFactory;}@Overridevoid prepare() {// TODO Auto-generated method stubSystem.out.println("Preparing " + name);dough = ingredientFactory.createDough();sauce = ingredientFactory.createSauce();cheese = ingredientFactory.createCheese();}}

Pizza_Clam.java

package com.jing.factory.abs;public class Pizza_Clam extends Pizza {PizzaIngredientFactory ingredientFactory;public Pizza_Clam(PizzaIngredientFactory ingredientFactory){this.ingredientFactory = ingredientFactory;}@Overridevoid prepare() {// TODO Auto-generated method stubSystem.out.println("Preparing " + name);dough = ingredientFactory.createDough();sauce = ingredientFactory.createSauce();cheese = ingredientFactory.createCheese();clam = ingredientFactory.createClam();}}

Pizza_Pepperoni.java

package com.jing.factory.abs;public class Pizza_Pepperoni extends Pizza {PizzaIngredientFactory ingredientFactory;public Pizza_Pepperoni(PizzaIngredientFactory ingredientFactory){this.ingredientFactory = ingredientFactory;}@Overridevoid prepare() {// TODO Auto-generated method stubSystem.out.println("Preparing " + name);dough = ingredientFactory.createDough();sauce = ingredientFactory.createSauce();cheese = ingredientFactory.createCheese();veggies = ingredientFactory.createVeggies();pepperoni = ingredientFactory.createPepperoni();}}

Pizza_Veggie.java

package com.jing.factory.abs;public class Pizza_Veggie extends Pizza {PizzaIngredientFactory ingredientFactory;public Pizza_Veggie(PizzaIngredientFactory ingredientFactory){this.ingredientFactory = ingredientFactory;}public void prepare(){System.out.println("Preparing " + name);dough = ingredientFactory.createDough();sauce = ingredientFactory.createSauce();cheese = ingredientFactory.createCheese();veggies = ingredientFactory.createVeggies();}}

有了披萨后，我们应该开始写披萨店了

PizzaStore.java

package com.jing.factory.abs;public abstract class PizzaStore {protected abstract Pizza createPizza(String type);public Pizza orderPizza(String type) {Pizza pizza = createPizza(type);System.out.println("-------- Making a " + pizza.getName() + " -----");pizza.prepare();pizza.bake();pizza.cut();pizza.box();return pizza;}}

PizzaStoreChicago.java

package com.jing.factory.abs;public class PizzaStoreChicago extends PizzaStore {@Overrideprotected Pizza createPizza(String type) {// TODO Auto-generated method stubPizza pizza = null;PizzaIngredientFactory ingredientFactory = new PizzaIngredientFactoryChicago();if (type.equals("cheese")){pizza = new Pizza_Cheese(ingredientFactory);pizza.setName("Chicago Style Cheese Pizza");} else if (type.equals("veggie")){pizza = new Pizza_Veggie(ingredientFactory);pizza.setName("Chicago Style Veggie Pizza");} else if (type.equals("clam")){pizza = new Pizza_Clam(ingredientFactory);pizza.setName("Chicago Style Clam Pizza");} else if (type.equals("pepperoni")){pizza = new Pizza_Pepperoni(ingredientFactory);pizza.setName("Chicago Style Pepperoni Pizza");}return pizza;}}

PizzaStoreNY.java

package com.jing.factory.abs;public class PizzaStoreNY extends PizzaStore {@Overrideprotected Pizza createPizza(String type) {// TODO Auto-generated method stubPizza pizza = null;PizzaIngredientFactory ingredientFactory = new PizzaIngredientFactoryNY();if (type.equals("cheese")){pizza = new Pizza_Cheese(ingredientFactory);pizza.setName("NY Style Cheese Pizza");} else if (type.equals("veggie")){pizza = new Pizza_Veggie(ingredientFactory);pizza.setName("NY Style Veggie Pizza");} else if (type.equals("clam")){pizza = new Pizza_Clam(ingredientFactory);pizza.setName("NY Style Clam Pizza");} else if (type.equals("pepperoni")){pizza = new Pizza_Pepperoni(ingredientFactory);pizza.setName("NY Style Pepperoni Pizza");}return pizza;}}

现在开始写测试类

Test.java

package com.jing.factory.abs;public class Test {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stub// 开一个纽约的披萨店PizzaStore nyStore = new PizzaStoreNY();// 开 一个芝加哥的披萨店PizzaStore chicagoStore = new PizzaStoreChicago();Pizza pizza = null;// 开始订披萨// 奶酪披萨pizza = nyStore.orderPizza("cheese");System.out.println("Customer A ordered a " + pizza + "\n");pizza = chicagoStore.orderPizza("cheese");System.out.println("Customer B ordered a " + pizza + "\n");// 蛤蜊披萨pizza = nyStore.orderPizza("clam");System.out.println("Customer A ordered a " + pizza + "\n");pizza = chicagoStore.orderPizza("clam");System.out.println("Customer B ordered a " + pizza + "\n");// 意式辣肠披萨pizza = nyStore.orderPizza("pepperoni");System.out.println("Customer A ordered a " + pizza + "\n");pizza = chicagoStore.orderPizza("pepperoni");System.out.println("Customer B ordered a " + pizza + "\n");// 蔬菜披萨pizza = nyStore.orderPizza("veggie");System.out.println("Customer A ordered a " + pizza + "\n");pizza = chicagoStore.orderPizza("veggie");System.out.println("Customer B ordered a " + pizza + "\n");}}

输出

-------- Making a NY Style Cheese Pizza -----Preparing NY Style Cheese PizzaBake for 25 minutes at 350Cutting the pizza into diagonal slicesPlace pizza in offical PizzaStore boxCustomer A ordered a ----- NY Style Cheese Pizza --------- NY Style DoughNY Style SauceNY Style Cheese-------- Making a Chicago Style Cheese Pizza -----Preparing Chicago Style Cheese PizzaBake for 25 minutes at 350Cutting the pizza into diagonal slicesPlace pizza in offical PizzaStore boxCustomer B ordered a ----- Chicago Style Cheese Pizza --------- Chicago Style DoughChicago Style SauceChicago Style Cheese-------- Making a NY Style Clam Pizza -----Preparing NY Style Clam PizzaBake for 25 minutes at 350Cutting the pizza into diagonal slicesPlace pizza in offical PizzaStore boxCustomer A ordered a ----- NY Style Clam Pizza --------- NY Style DoughNY Style SauceNY Style Cheese-------- Making a Chicago Style Clam Pizza -----Preparing Chicago Style Clam PizzaBake for 25 minutes at 350Cutting the pizza into diagonal slicesPlace pizza in offical PizzaStore boxCustomer B ordered a ----- Chicago Style Clam Pizza --------- Chicago Style DoughChicago Style SauceChicago Style CheeseChicago Style Clams-------- Making a NY Style Pepperoni Pizza -----Preparing NY Style Pepperoni PizzaBake for 25 minutes at 350Cutting the pizza into diagonal slicesPlace pizza in offical PizzaStore boxCustomer A ordered a ----- NY Style Pepperoni Pizza --------- NY Style DoughNY Style SauceNY Style CheeseVeggies Garlic, Veggies Red Pepper, Veggies MushroomNY Style Pepperoni-------- Making a Chicago Style Pepperoni Pizza -----Preparing Chicago Style Pepperoni PizzaBake for 25 minutes at 350Cutting the pizza into diagonal slicesPlace pizza in offical PizzaStore boxCustomer B ordered a ----- Chicago Style Pepperoni Pizza --------- Chicago Style DoughChicago Style SauceChicago Style CheeseVeggies Olives, Veggies Mushroom, Veggies OnionChicago Style Pepperoni-------- Making a NY Style Veggie Pizza -----Preparing NY Style Veggie PizzaBake for 25 minutes at 350Cutting the pizza into diagonal slicesPlace pizza in offical PizzaStore boxCustomer A ordered a ----- NY Style Veggie Pizza --------- NY Style DoughNY Style SauceNY Style CheeseVeggies Garlic, Veggies Red Pepper, Veggies Mushroom-------- Making a Chicago Style Veggie Pizza -----Preparing Chicago Style Veggie PizzaBake for 25 minutes at 350Cutting the pizza into diagonal slicesPlace pizza in offical PizzaStore boxCustomer B ordered a ----- Chicago Style Veggie Pizza --------- Chicago Style DoughChicago Style SauceChicago Style CheeseVeggies Olives, Veggies Mushroom, Veggies Onion