设计模式之工厂模式(2)工厂方法模式

学习设计模式的日常Demo

工厂方法模式

工厂方法模式介绍

代码实现:

abstract class OrderPizza {
    
    // 定义一个抽象方法,让各个工厂自己实现
    abstract Pizza createPizza(String orderType);

    public void buy() {
        String orderType = ""; // 用户输入的
        Pizza pizza = null;
        do {
            orderType = getType();
            pizza = createPizza(orderType);     // 抽象方法,由工厂子类实现
            //输出pizza
            if (pizza != null) { // 订购成功
                pizza.prepare();
                pizza.bake();
                pizza.cut();
                pizza.box();
            } else {
                System.out.println("订购披萨失败");
                break;
            }
        } while (true);
    }


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

// 伦敦订单只准备伦敦的口味
public class LDOrderPizza extends OrderPizza {
    @Override
    Pizza createPizza(String orderType) {
        Pizza pizza = null;
        if (orderType.equals("chess")) {
            pizza = new LDCheesePizza();
        } else if (orderType.equals("pepper")) {
            pizza = new LDPepperPizza();
        }
        return pizza;
    }
}

// 北京订单只准备北京的口味
public class BJOrderPizza extends OrderPizza {
    @Override
    Pizza createPizza(String orderType) {
        Pizza pizza = null;
        if (orderType.equals("chess")) {
            pizza = new BJCheesePizza();
        } else if (orderType.equals("pepper")) {
            pizza = new BJPepperPizza();
        }
        return pizza;
    }
}
// 定义抽象Pizza
public abstract class Pizza {
    protected String name; //名字

    //准备原材料, 不同的披萨不一样，因此，我们做成抽象方法
    public abstract void prepare();


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

    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;
    }

    public String getName() {
        return name;
    }
}

// 定义具体的各个pizza类
public class BJCheesePizza extends Pizza {
	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		setName("北京奶酪pizza");
		System.out.println("准备*北京奶酪*原材料");
	}
}

public class BJPepperPizza extends Pizza {

	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		setName("北京胡椒pizza");
		System.out.println("准备*北京胡椒*原材料");
	}

}

public class LDCheesePizza extends Pizza {

	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		setName("伦敦奶酪pizza");
		System.out.println("准备*伦敦奶酪*原材料");
	}

}

public class LDPepperPizza extends Pizza {

	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		setName("伦敦胡椒pizza");
		System.out.println("准备*伦敦胡椒*原材料");
	}

}

// 测试类
public class Test {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = "";
        boolean flag = true;
        while (flag) {
            System.out.println("欢迎来到pizza点单系统!请按照提示输入!");
            System.out.println("北京---->北京地区披萨");
            System.out.println("伦敦---->伦敦地区披萨");
            System.out.println("quit--->退出");
            s = sc.nextLine();
            switch (s) {
                case "北京":
                    new BJOrderPizza().buy();
                    break;
                case "伦敦":
                    new LDOrderPizza().buy();
                    break;
                case "quit":
                    flag = false;
                    break;
                default:
                    break;
            }
        }

    }
}

GitHub:设计模式源代码

来源：CSDN

作者：咣咣咣.

链接：https://blog.csdn.net/qq_44779506/article/details/104795935