设计模式-2-抽象工厂方法

一、概述

1-抽象工厂
提供一个接口,用于创建相关或者依赖对象的家族,而不需要指定具体的实现类
2-设计原则
(1)开闭(2)多用组合,少继承
抽象工厂和工厂方法的区别
(1)工厂通过继承解耦;抽象工厂通过组合解耦
(2)工厂用于创建一个抽象产品,具体的工厂用于创建具体的产品;抽象工厂用于创建一个产品家族的抽象类型
3-使用场合
(1)创建产品家族
(2)提供一个产品库,并只想显示器接口而非实现


========抽象食物接口
package SheJiMoShiNaDianShi.AbstractFactory.model;

/**
 * Created by hjw on 16/8/28.
 * 食物辅助接口,用于实现共性,如打印信息
 */
public interface IFood {
    public void printMessage();
}



========抽象食物

package SheJiMoShiNaDianShi.AbstractFactory.model;

/**
 * Created by hjw on 16/8/28.
 * 抽象的食物对象
 */
public abstract class AbstractBaseFood {
    //类别
    protected String kind;
    //数量
    protected int num;

    //单价
    protected float price;

    //总价
    public float totalPrice() {
        return this.num * this.price;
    }
}

========抽象食物鸡翅
package SheJiMoShiNaDianShi.AbstractFactory.model;

/**
 * Created by hjw on 16/8/28.
 */
public abstract class ChickenWings extends AbstractBaseFood implements IFood{
    @Override
    public void printMessage() {
        System.out.println("----"+this.kind+"风味鸡翅,\t 单价:"+this.price + ", \t数量:"+this.num+
                ", \t总计:"+this.totalPrice());
    }
}

========抽象食物汉堡
package SheJiMoShiNaDianShi.AbstractFactory.model;

/**
 * Created by hjw on 16/8/28.
 * 创建不同食物的抽象类
 */
public abstract class Hamburg extends AbstractBaseFood implements  IFood{
    @Override
    public void printMessage() {
        System.out.println("----"+this.kind+"风味汉堡,\t 单价:"+this.price + ", \t数量:"+this.num+
                ", \t总计:"+this.totalPrice());
    }
}



========具体食物鸡翅
package SheJiMoShiNaDianShi.AbstractFactory.model.kfc;

import SheJiMoShiNaDianShi.AbstractFactory.model.ChickenWings;

/**
 * Created by hjw on 16/8/28.
 * 鸡翅实现类
 */
public class ChinaChickenWings extends ChickenWings {
    /**
     * 构造函数
     * @param kind
     * @param price
     * @param num
     */
    public ChinaChickenWings(String kind,float price,int num) {
        this.kind = kind;
        this.price = price;
        this.num = num;
    }

}



========具体食物汉堡
package SheJiMoShiNaDianShi.AbstractFactory.model.kfc;

import SheJiMoShiNaDianShi.AbstractFactory.model.Hamburg;

/**
 * Created by hjw on 16/8/28.
 * 创建具体的食物
 */
public class ChinaHamburg extends Hamburg {
    /**
     * 构造函数
     * @param kind
     * @param price
     * @param num
     */
    public ChinaHamburg(String kind,float price,int num) {
        this.kind = kind;
        this.price = price;
        this.num = num;
    }
}



========抽象工厂接口
package SheJiMoShiNaDianShi.AbstractFactory.itf;

import SheJiMoShiNaDianShi.AbstractFactory.model.ChickenWings;
import SheJiMoShiNaDianShi.AbstractFactory.model.Hamburg;

/**
 * Created by hjw on 16/8/28.
 * 抽象工厂接口
 */
public interface IKfcFactory {
    public Hamburg creatHamburg(String kind,float price,int num);
    public ChickenWings creatChichenWings(String kind,float price,int num);
}


========具体工厂
package SheJiMoShiNaDianShi.AbstractFactory.itf;

import SheJiMoShiNaDianShi.AbstractFactory.model.ChickenWings;
import SheJiMoShiNaDianShi.AbstractFactory.model.Hamburg;
import SheJiMoShiNaDianShi.AbstractFactory.model.kfc.ChinaChickenWings;
import SheJiMoShiNaDianShi.AbstractFactory.model.kfc.ChinaHamburg;

/**
 * Created by hjw on 16/8/28.
 * 具体的工厂
 */
public class ChinaKfcFactory implements IKfcFactory {
    @Override
    public Hamburg creatHamburg(String kind, float price, int num) {
        return new ChinaHamburg(kind, price, num);
    }

    @Override
    public ChickenWings creatChichenWings(String kind, float price, int num) {
        return new ChinaChickenWings(kind, price, num);
    }
}


=====客户类-通过工厂暴露的方法实现具体对象的创建
package SheJiMoShiNaDianShi.AbstractFactory.custom;

import SheJiMoShiNaDianShi.AbstractFactory.itf.IKfcFactory;
import SheJiMoShiNaDianShi.AbstractFactory.model.ChickenWings;
import SheJiMoShiNaDianShi.AbstractFactory.model.Hamburg;

/**
 * Created by hjw on 16/8/28.
 * 客户类-通过工厂暴露的方法实现具体对象的创建
 */
public class Custom {
    IKfcFactory iKfcFactory;

    public Custom(IKfcFactory iKfcFactory) {
        this.iKfcFactory = iKfcFactory;
    }

    public float orderHamburg(String kind, float price, int num){
        Hamburg hamburg =  iKfcFactory.creatHamburg(kind, price, num);
        hamburg.printMessage();
        return hamburg.totalPrice();
    }

    public float orderChickenWings(String kind, float price, int num){
        ChickenWings chickenWings = iKfcFactory.creatChichenWings(kind, price, num);
        chickenWings.printMessage();
        return chickenWings.totalPrice();
    }
}

=====app
package SheJiMoShiNaDianShi.AbstractFactory;

import SheJiMoShiNaDianShi.AbstractFactory.custom.Custom;
import SheJiMoShiNaDianShi.AbstractFactory.itf.ChinaKfcFactory;
import SheJiMoShiNaDianShi.AbstractFactory.itf.IKfcFactory;

/**
 * Created by hjw on 16/8/28.
 */
public class MainApp {
    public static void main(String[] args) {
        IKfcFactory iKfcFactory = new ChinaKfcFactory();

        Custom custom = new Custom(iKfcFactory);

        float hamburgMoney = custom.orderHamburg("麻辣", 1.2f, 2);
        float chichenWingsMoney = custom.orderChickenWings("奥尔良", 2, 4);
        System.out.println("总计: " + (hamburgMoney + chichenWingsMoney));
    }
}