设计模式4-工厂方法模式

Posted 2021-02-16 zhouyu0-0

package DesignPattern;

import java.util.ArrayList;

public class FactoryMethodPattern {
    /*
    工厂方法模式要点在于将创建方法设定为抽象方法，工厂类为抽象类
    适用于不同的原料配置，自定义创建方法从而形成一类产品
    将创建方法开放给子类，带来的好处，共享流程和原料，创建不同的产品
     */
    public static abstract class Pizza{
        String name;
        String dough;
        String sauce;
        ArrayList<String> toppings = new ArrayList();

        public 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));
            }
        }
        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 name(){
            return name;
        }
    }
    //纽约风格起司披萨
    public static class NYStyleCheesePizza extends Pizza{
        public NYStyleCheesePizza(){
            this.name="NY Style Sauce and Cheese Pizza";
            this.dough="Thin Crust Dough";
            this.sauce="Marinara Sauce";
            toppings.add("Grated Reggiano Cheese");
        }
    }
    //芝加哥风格起司披萨
    public static class ChicagoStyleCheesePizza extends Pizza{
        public ChicagoStyleCheesePizza(){
            this.name="Chicago Style Deep Dish Cheese Pizza";
            this.dough="Extra Thick Crust Dough";
            this.sauce="Plum Tomato Sauce";
            toppings.add("Shreded Mozzarella Cheese");
        }
        public void cut(){
            System.out.println("Cuttring the pizza into square slices");
        }
    }
    public static abstract class PizzaStore{
        public Pizza orderPizza(String type){
            Pizza pizza=createPizza(type);
            pizza.prepare();
            pizza.bake();
            pizza.cut();
            pizza.box();
            return pizza;
        }
        abstract Pizza createPizza(String type);
    }
    //纽约风格披萨店
    public static class NYStylePizzaStore extends PizzaStore{
        @Override
        Pizza createPizza(String type) {
            if(type.equals("cheese")){
                return new NYStyleCheesePizza();
            }//此处可添加同风格其他类型的
            return null;
        }
    }
    //芝加哥风格披萨店
    public static class ChicagoPizzaStore extends PizzaStore{
        @Override
        Pizza createPizza(String type) {
            if(type.equals("cheese")){
                return new ChicagoStyleCheesePizza();
            }//此处可添加同风格其他类型的
            return null;
        }
    }

    public static void main(String[] args) {
        PizzaStore nyStore = new NYStylePizzaStore();
        nyStore.orderPizza("cheese");
        System.out.println();
        PizzaStore chicagoStore = new ChicagoPizzaStore();
        chicagoStore.orderPizza("cheese");
        System.out.println();
    }

}