工厂方法模式

package com.atguigu.factory.factorymethod.pizzastore.pizza;

/**
 * 将披萨类做成抽象类
 */
public abstract class Pizza {
    protected String name;  // 披萨的名字

    // 准备原材料，不同的披萨是不一样的，因此，做成抽象方法让子类来实现
    public abstract void prepare();

    // 烘烤
    public void bake() {
        System.out.println(name + " baking;");
    }

    // 切割
    public void cut() {
        System.out.println(name + " cutting;");
    }

    // 打包
    public void box() {
        System.out.println(name + " boxing;");
    }

    public void setName(String name) {
        this.name = name;
    }
}

package com.atguigu.factory.factorymethod.pizzastore.pizza;

public class BJCheesePizza extends Pizza {

    @Override
    public void prepare() {
        setName("北京奶酪披萨");
        System.out.println("北京奶酪披萨 准备原料");
    }
}

package com.atguigu.factory.factorymethod.pizzastore.pizza;

public class BJPepperPizza extends Pizza {
    @Override
    public void prepare() {
        setName("北京胡椒披萨");
        System.out.println("北京胡椒披萨 准备原料");
    }
}

package com.atguigu.factory.factorymethod.pizzastore.pizza;

public class LDCheesePizza extends Pizza {

    @Override
    public void prepare() {
        setName("伦敦奶酪披萨");
        System.out.println("伦敦奶酪披萨 准备原料");
    }
}

package com.atguigu.factory.factorymethod.pizzastore.pizza;

public class LDPepperPizza extends Pizza {
    @Override
    public void prepare() {
        setName("伦敦胡椒披萨");
        System.out.println("伦敦胡椒披萨 准备原料");
    }
}

package com.atguigu.factory.factorymethod.pizzastore.order;

import com.atguigu.factory.factorymethod.pizzastore.pizza.Pizza;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public abstract class OrderPizza {

    // 定义一个抽象方法， createPizza ，让各个工厂子类自己实现
    abstract Pizza createPizza(String orderType);

    // 构造器
    public OrderPizza() {
        Pizza pizza = null;
        String orderType;   // 订购披萨的类型
        do {
            orderType = getType();
            pizza = createPizza(orderType);     // 抽象方法，由工厂子类完成
            // 输出 pizza 制作过程
            pizza.prepare();
            pizza.bake();
            pizza.cut();
            pizza.box();
        } while (true);
    }

    // 写一个方法，可以获取客户希望订购的披萨种类
    private String getType() {
        try {
            BufferedReader strin = new BufferedReader(new InputStreamReader(System.in));
            System.out.println("input pizza type:");
            String str = strin.readLine();
            return str;
        } catch (IOException e) {
            e.printStackTrace();
            return "";
        }
    }
}

package com.atguigu.factory.factorymethod.pizzastore.order;

import com.atguigu.factory.factorymethod.pizzastore.pizza.BJCheesePizza;
import com.atguigu.factory.factorymethod.pizzastore.pizza.BJPepperPizza;
import com.atguigu.factory.factorymethod.pizzastore.pizza.Pizza;

public class BJOrderPizza extends OrderPizza {

    @Override
    Pizza createPizza(String orderType) {

        Pizza pizza = null;
        if (orderType.equals("cheese")){
            pizza = new BJCheesePizza();
        } else if (orderType.equals("pepper")){
            pizza = new BJPepperPizza();
        }
        return pizza;
    }
}

package com.atguigu.factory.factorymethod.pizzastore.order;

import com.atguigu.factory.factorymethod.pizzastore.pizza.*;

/**
 * 伦敦订购披萨
 */
public class LDOrderPizza extends OrderPizza {

    @Override
    Pizza createPizza(String orderType) {

        Pizza pizza = null;
        if (orderType.equals("cheese")){
            pizza = new LDCheesePizza();
        } else if (orderType.equals("pepper")){
            pizza = new LDPepperPizza();
        }
        return pizza;
    }
}

package com.atguigu.factory.factorymethod.pizzastore.order;

/**
 * 测试类
 */
public class PizzaStore {
    public static void main(String[] args) {

        String loc = "bj";
        if (loc.equals("bj")){
            // 创建北京的口味的各种Pizza
            new BJOrderPizza();
        }else {
            // 创建伦敦的口味的各种Pizza
            new LDOrderPizza();
        }
    }
}