工厂模式之简单工厂模式、方法工厂模式、抽象工厂模式

简单工厂模式

传统方式

/**
 * @Author: Antares
 * @Date: 2020/2/22 14:15
 */
public abstract class Pizza {

    protected String name;

    /**
     * 原材料准备
     */
    public abstract void prepare();

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

    }

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

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

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

/**
 * @Author: Antares
 * @Date: 2020/2/22 14:23
 */
public class CheesePizza extends Pizza {


    /**
     * 原材料准备
     */
    @Override
    public void prepare() {
        System.out.println("给 CheesePizza准备");
    }
}

/**
 * @Author: Antares
 * @Date: 2020/2/22 14:23
 */
public class GreekPizza extends Pizza {


    /**
     * 原材料准备
     */
    @Override
    public void prepare() {
        System.out.println("给GreekPizza准备");
    }
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * @Author: Antares
 * @Date: 2020/2/22 14:27
 */
public class OrderPizza {

    public OrderPizza() {
        Pizza pizza = null;
        String orderType;
        do {
            orderType = getType();
            if (orderType.equals("GreekPizza")) {
                pizza = new GreekPizza();
                pizza.setName("GreekPizza");
            } else if (orderType.equals("CheesePizza")) {
                pizza = new CheesePizza();
                pizza.setName("CheesePizza");
            } else {
                break;
            }
            pizza.prepare();
            pizza.bake();
            pizza.cut();
            pizza.box();
        } while (true);
    }

    private String getType() {
        BufferedReader strin = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("input pizza type");
        String str = null;
        try {
            str = strin.readLine();
        } catch (IOException e) {
            e.printStackTrace();
            return "";
        }
        return str;
    }

}

/**
 * @Author: Antares
 * @Date: 2020/2/22 14:39
 */
public class PizzaStore {
    public static void main(String[] args) {
        OrderPizza orderPizza = new OrderPizza();

    }
}

优点时比较好理解

缺点是违反了设计模式的ocp原则

修改

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * @Author: Antares
 * @Date: 2020/2/22 14:27
 */
public class OrderPizza {

    public OrderPizza(SimpleFactory sf) {
        /*
        Pizza pizza = null;
        String orderType;
        do {
            orderType = getType();
            if (orderType.equals("GreekPizza")) {
                pizza = new GreekPizza();
                pizza.setName("GreekPizza");
            } else if (orderType.equals("CheesePizza")) {
                pizza = new CheesePizza();
                pizza.setName("CheesePizza");
            } else {
                break;
            }
            pizza.prepare();
            pizza.bake();
            pizza.cut();
            pizza.box();
        } while (true);

         */
        setFactory(sf);
    }


    SimpleFactory sf;
    Pizza pizza = null;

    public void setFactory(SimpleFactory factory) {
        this.sf = factory;
        String orderType = "";

        do {
            orderType = getType();
            pizza = this.sf.createPizza(orderType);
            if (pizza != null) {
                pizza.prepare();
                pizza.bake();
                pizza.cut();
                pizza.box();
            } else {
                break;
            }
        } while (true);
    }

    private String getType() {
        BufferedReader strin = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("input pizza type");
        String str = null;
        try {
            str = strin.readLine();
        } catch (IOException e) {
            e.printStackTrace();
            return "";
        }
        return str;
    }

}

/**
 * @Author: Antares
 * @Date: 2020/2/22 16:24
 */
public class SimpleFactory {


    public Pizza createPizza(String orderType) {
        Pizza pizza = null;

        if (orderType.equals("GreekPizza")) {
            pizza = new GreekPizza();
            pizza.setName("GreekPizza");
        } else if (orderType.equals("CheesePizza")) {
            pizza = new CheesePizza();
            pizza.setName("CheesePizza");
        }
        return pizza;


    }
}

/**
 * @Author: Antares
 * @Date: 2020/2/22 14:39
 */
public class PizzaStore {
    public static void main(String[] args) {
//        OrderPizza orderPizza = new OrderPizza();

        new OrderPizza(new SimpleFactory());
        System.out.println("exit");
    }
}

定义了一个创建对象的类,由这个类来封装实例化对象的行为

工厂方法模式

/**
 * @Author: Antares
 * @Date: 2020/2/22 14:15
 */
public abstract class Pizza {

    protected String name;

    /**
     * 原材料准备
     */
    public abstract void prepare();

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

    }

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

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

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

public class BJCheesePizza extends Pizza {

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

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();
		}
		// TODO Auto-generated method stub
		return pizza;
	}

}

import com.atguigu.factory.factorymethod.pizzastore.pizza.BJCheesePizza;
import com.atguigu.factory.factorymethod.pizzastore.pizza.BJPepperPizza;
import com.atguigu.factory.factorymethod.pizzastore.pizza.LDCheesePizza;
import com.atguigu.factory.factorymethod.pizzastore.pizza.LDPepperPizza;
import com.atguigu.factory.factorymethod.pizzastore.pizza.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();
		}
		// TODO Auto-generated method stub
		return pizza;
	}

}

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

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 种类:");
			String str = strin.readLine();
			return str;
		} catch (IOException e) {
			e.printStackTrace();
			return "";
		}
	}

}

public class PizzaStore {

	public static void main(String[] args) {
		String loc = "bj";
		if (loc.equals("bj")) {
			//创建北京口味的各种Pizza
			new BJOrderPizza();
		} else {
			//创建伦敦口味的各种Pizza
			new LDOrderPizza();
		}
		// TODO Auto-generated method stub
	}

}

定义了一个创建对象的抽象方法,由子类决定要实例化的类

将对象的实例化推迟到子类

抽象工厂模式

定义了一个接口用于创建相关或有关依赖关系的对象簇,而无需指明具体的类

抽象工厂模式可以将简单工厂模式和工厂方法模式进行整合

将工厂抽象成两层,抽象工厂和具体的实现类,可以根据创建对象类型使用对应的工厂子类