《HeadFirst设计模式(第二版)》第四章代码——工厂模式

代码文件目录结构：

Cheese:

原料ingredient类中只以Cheese为例，不重复展示：

package Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient;/*** @Author 竹心* @Date 2023/8/4**/public abstract class Cheese {String name;String getName(){return name;}
}

package Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient;/*** @Author 竹心* @Date 2023/8/4**/public class NYCheese extends Cheese{public NYCheese() {name = "NYCheese";}
}

package Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient;/*** @Author 竹心* @Date 2023/8/4**/public class ChicagoCheese extends Cheese{public ChicagoCheese(){name = "ChicagoCheese";}
}

PizzaIngredientFactory

package Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient;/*** @Author 竹心* @Date 2023/8/4**/public interface PizzaIngredientFactory {public Dough createDough();public Sauce createSauce();public Cheese createCheese();public Clams createClams();
}

NYPizzaIngredientFactory 

package Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient;/*** @Author 竹心* @Date 2023/8/4**/public class NYPizzaIngredientFactory implements PizzaIngredientFactory{@Overridepublic Dough createDough() {return new NYDough();}public Sauce createSauce(){return new NYSauce();}@Overridepublic Cheese createCheese() {return new NYCheese();}@Overridepublic Clams createClams() {return new NYClams();}
}

ChicagoPizzaIngredientFactory

package Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient;/*** @Author 竹心* @Date 2023/8/4**/public class ChicagoPizzaIngredientFactory implements PizzaIngredientFactory{@Overridepublic Dough createDough() {return new ChicagoDough();}public Sauce createSauce(){return new ChicagoSauce();}@Overridepublic Cheese createCheese() {return new ChicagoCheese();}@Overridepublic Clams createClams() {return new ChicagoClams();}
}

Pizza

package Chapter4_FactoryPattern.abstractFactoryPattern.Products;import Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient.*;/*** @Author 竹心* @Date 2023/8/4**/public abstract class Pizza {String name;Dough dough;Sauce sauce;Cheese cheese;Clams clams;public abstract void prepare();public void bake(){System.out.println("Bake for 25 minutes at 350");}public void cut(){System.out.println("Cutting the pizza into diagonal slices");}public void box(){System.out.println("place pizza in official PizzaStore box");}public String getName(){return name;}public void setName(String name) {this.name = name;}@Overridepublic String toString() {return "Pizza{" +"name='" + name + '\'' +", dough=" + dough +", sauce=" + sauce +", cheese=" + cheese +", clams=" + clams +'}';}
}

CheesePizza

package Chapter4_FactoryPattern.abstractFactoryPattern.Products;import Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient.PizzaIngredientFactory;/*** @Author 竹心* @Date 2023/8/4**/public class CheesePizza extends Pizza{PizzaIngredientFactory ingredientFactory;public CheesePizza(PizzaIngredientFactory ingredientFactory){//在初始化的时候确定是哪一种品味（通过原料工厂）this.ingredientFactory = ingredientFactory;}@Overridepublic void prepare() {System.out.println("preparing "+name);dough = ingredientFactory.createDough();sauce = ingredientFactory.createSauce();cheese = ingredientFactory.createCheese();}
}

ClamPizza

package Chapter4_FactoryPattern.abstractFactoryPattern.Products;import Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient.PizzaIngredientFactory;/*** @Author 竹心* @Date 2023/8/4**/public class ClamPizza extends Pizza{PizzaIngredientFactory ingredientFactory;public ClamPizza(PizzaIngredientFactory ingredientFactory){this.ingredientFactory = ingredientFactory;}@Overridepublic void prepare() {System.out.println("preparing "+name);dough = ingredientFactory.createDough();sauce = ingredientFactory.createSauce();cheese = ingredientFactory.createCheese();clams = ingredientFactory.createClams();}
}

PizzaStore

package Chapter4_FactoryPattern.abstractFactoryPattern;import Chapter4_FactoryPattern.abstractFactoryPattern.Products.Pizza;/*** @Author 竹心* @Date 2023/8/4**/public abstract class PizzaStore {public Pizza orderPizza(String type){Pizza pizza;pizza = createPizza(type);pizza.prepare();pizza.bake();pizza.cut();pizza.box();return pizza;}protected abstract Pizza createPizza(String type);}

NYPizzaStore

package Chapter4_FactoryPattern.abstractFactoryPattern;import Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient.NYPizzaIngredientFactory;
import Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient.PizzaIngredientFactory;
import Chapter4_FactoryPattern.abstractFactoryPattern.Products.CheesePizza;
import Chapter4_FactoryPattern.abstractFactoryPattern.Products.ClamPizza;
import Chapter4_FactoryPattern.abstractFactoryPattern.Products.Pizza;/*** @Author 竹心* @Date 2023/8/4**/public class NYPizzaStore extends PizzaStore {protected Pizza createPizza(String item){Pizza pizza = null;PizzaIngredientFactory ingredientFactory =new NYPizzaIngredientFactory();if(item == "cheese"){pizza = new CheesePizza(ingredientFactory);pizza.setName("New York Style Cheese Pizza");}else if(item =="clam"){pizza = new ClamPizza(ingredientFactory);pizza.setName("New York Style Clam Pizza");}return pizza;}
}

ChicagoPizzaStore

package Chapter4_FactoryPattern.abstractFactoryPattern;import Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient.ChicagoPizzaIngredientFactory;
import Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient.PizzaIngredientFactory;
import Chapter4_FactoryPattern.abstractFactoryPattern.Products.CheesePizza;
import Chapter4_FactoryPattern.abstractFactoryPattern.Products.ClamPizza;
import Chapter4_FactoryPattern.abstractFactoryPattern.Products.Pizza;/*** @Author 竹心* @Date 2023/8/4**/public class ChicagoPizzaStore extends PizzaStore {@Overrideprotected Pizza createPizza(String item) {Pizza pizza = null;PizzaIngredientFactory ingredientFactory =new ChicagoPizzaIngredientFactory();if(item == "cheese"){pizza = new CheesePizza(ingredientFactory);pizza.setName("Chicago Style Cheese Pizza");}else if(item =="clam"){pizza = new ClamPizza(ingredientFactory);pizza.setName("Chicago Style Clam Pizza");}return pizza;}
}

PizzaTestDrive

package Chapter4_FactoryPattern.abstractFactoryPattern;import Chapter4_FactoryPattern.abstractFactoryPattern.Products.Pizza;/*** @Author 竹心* @Date 2023/8/4**/public class PizzaTestDrive {public static void main(String[] args) {PizzaStore nyStore = new NYPizzaStore();PizzaStore chicagoStore = new ChicagoPizzaStore();Pizza pizza = nyStore.orderPizza("cheese");System.out.println("Ethan ordered a "+pizza.getName()+'\n');pizza = chicagoStore.orderPizza("cheese");System.out.println("Joel ordered a "+pizza.getName()+'\n');}
}

notes:

简单工厂模式：就是将平常的new过程封装成一个类来实现工厂方法模式：定义一个创建对象的接口，但是由它的子类决定要实例化哪个类。工厂方法让类把实例化推迟到子类这里的“决定”其实是表示用哪个接口子类来创建产品。抽象工厂模式：提供一个接口，用于创建相关或者依赖对象的家族，而不必指定他们的具体类

运行结果：