public abstract class Pizza {String name;String dough;String sauce;ArrayList toppings = new ArrayList();void prepare() {System.out.println("Preparing " + name);System.out.println("Tossing dough...");System.out.println("Adding sauce...");System.out.println("Adding toppings: ");for (int i = 0; i < toppings.size(); i++) {System.out.println("   " + toppings.get(i));}}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 official PizzaStore box");}public String getName() {return name;}public String toString() {StringBuffer display = new StringBuffer();display.append("---- " + name + " ----\n");display.append(dough + "\n");display.append(sauce + "\n");for (int i = 0; i < toppings.size(); i++) {display.append((String )toppings.get(i) + "\n");}return display.toString();}
}public class NYStyleCheesePizza extends Pizza {public NYStyleCheesePizza() { name = "NY Style Sauce and Cheese Pizza";dough = "Thin Crust Dough";sauce = "Marinara Sauce";toppings.add("Grated Reggiano Cheese");}
}public abstract class PizzaStore {abstract Pizza createPizza(String item);public Pizza orderPizza(String type) {//创建对象的接口Pizza pizza = createPizza(type);System.out.println("--- Making a " + pizza.getName() + " ---");pizza.prepare();pizza.bake();pizza.cut();pizza.box();return pizza;}
}public class NYPizzaStore extends PizzaStore {//由子类来决定具体实例化哪个Pizza createPizza(String item) {if (item.equals("cheese")) {return new NYStyleCheesePizza();} else if (item.equals("veggie")) {return new NYStyleVeggiePizza();} else if (item.equals("clam")) {return new NYStyleClamPizza();} else if (item.equals("pepperoni")) {return new NYStylePepperoniPizza();} else return null;}
}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");
}