Java 深入理解创建型设计模式之抽象工厂模式

package com.szh.factory.abstractfactory.pizza;
 

public abstract class Pizza {
    //Pizza名称
    protected String name;
 
    //准备原材料，不同的披萨不一样。因此，我们做成抽象方法，具体的原材料实现交给它的子类去完成
    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.szh.factory.abstractfactory.pizza;
 
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");
	}
 
}

package com.szh.factory.abstractfactory.pizza;
 
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");
	}
 
}

package com.szh.factory.abstractfactory.pizza;
 
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");
	}
 
}

package com.szh.factory.abstractfactory.pizza;
 
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");
	}
 
}

package com.szh.factory.abstractfactory.order;
 
import com.szh.factory.abstractfactory.pizza.Pizza;
 
//一个抽象工厂模式的抽象层(接口)
public interface AbsFactory {
    //让下面的工厂子类来具体实现
    public Pizza createPizza(String orderType);
}

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

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

package com.szh.factory.abstractfactory.order;
 
import com.szh.factory.abstractfactory.pizza.Pizza;
 
import java.util.Scanner;
 
public class OrderPizza {
 
    AbsFactory absFactory;
 
    public OrderPizza(AbsFactory absFactory) {
        setFactory(absFactory);
    }
 
    private void setFactory(AbsFactory absFactory) {
        Pizza pizza = null;
        String orderType = ""; // 用户输入
        this.absFactory = absFactory;
        do {
            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 = absFactory.createPizza(orderType);
            if (pizza != null) { // 订购ok
                pizza.prepare();
                pizza.bake();
                pizza.cut();
                pizza.box();
            } else {
                System.out.println("订购失败");
                break;
            }
        } 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() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入 pizza 种类: ");
        String str = scanner.nextLine();
        return str;
    }
}

package com.szh.abstractfactory;
 
import com.szh.abstractfactory.order.BJFactory;
import com.szh.abstractfactory.order.LDFactory;
import com.szh.abstractfactory.order.OrderPizza;
 
import java.util.Scanner;
 
public class MainTest {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String content = scanner.next();
        if ("Beijing".equals(content)) {
            new OrderPizza(new BJFactory());
        } else if ("London".equals(content)) {
            new OrderPizza(new LDFactory());
        } else {
            System.out.println("无法预先匹配Pizza种类....");
            scanner.close();
        }
    }
}