【Java设计模式】用 披萨订购案例 详细讲解三种工厂模式（三）

public class BJCheesePizza extends Pizza {
    @Override
    public void prepare() {
        setName("北京的奶酪pizza");
        System.out.println("北京的奶酪pizza 准备原材料");
    }
}

public class BJPepperPizza extends Pizza{
    @Override
    public void prepare() {
        setName("北京的胡椒pizza");
        System.out.println("北京的胡椒pizza 准备原材料");
    }
}

public class LDCheesePizza extends Pizza {
    @Override
    public void prepare() {
        setName("伦敦的奶酪pizza");
        System.out.println("伦敦的奶酪pizza 准备原材料");
    }
}

public class LDPepperPizza extends Pizza {
    @Override
    public void prepare() {
        setName("伦敦的胡椒pizza");
        System.out.println("伦敦的胡椒pizza 准备原材料");
    }
}

public abstract class OrderPizza {
    abstract Pizza createPizza(String orderType);
    public OrderPizza() {
        do {
            String orderType = getType();
            Pizza pizza = createPizza(orderType); //抽象方法，由工厂子类完成
            if (pizza == null){
                System.out.println("订购披萨失败");
                break;
            }
            pizza.prepare();
            pizza.bake();
            pizza.cut();
            pizza.box();
        } while (true);
    }
    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 "";
        }
    }
}

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;
    }
}

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;
    }
}

public class PizzaStore {
    public static void main(String[] args) {
        String loc = "beijing";
        if (loc.equals("beijing")) {
            new BJOrderPizza();
        } else {
            new LDOrderPizza();
        }
    }
}

public interface AbsFactory {
    public Pizza createPizza(String orderType);
}

public class BJFactory implements AbsFactory {
    @Override
    public Pizza createPizza(String orderType) {
        Pizza pizza = null;
        if(orderType.equals("cheese")) {
            pizza = new BJCheesePizza();
        } else if (orderType.equals("pepper")){
            pizza = new BJPepperPizza();
        }
        return pizza;
    }
}

public class LDFactory implements AbsFactory {
    @Override
    public Pizza createPizza(String orderType) {
        Pizza pizza = null;
        if (orderType.equals("cheese")) {
            pizza = new LDCheesePizza();
        } else if (orderType.equals("pepper")) {
            pizza = new LDPepperPizza();
        }
        return pizza;
    }
}

public class OrderPizza {
    private AbsFactory factory;
    public OrderPizza(AbsFactory factory) {
        setFactory(factory);
    }
    private void setFactory(AbsFactory factory) {
        do {
            this.factory = factory;
            String orderType = getType();
            // factory 可能是北京的工厂子类，也可能是伦敦的工厂子类
            Pizza pizza = factory.createPizza(orderType);
            if (pizza == null) { 
                System.out.println("订购失败");
                break;
            }
            pizza.prepare();
            pizza.bake();
            pizza.cut();
            pizza.box();
        } while (true);
    }   
    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 "";
        }
    }
}

步骤四：创建运行类
public class PizzaStore {
    public static void main(String[] args) {
        new OrderPizza(new LDFactory());
    }
}