Java使用抽象工厂模式实现的肯德基消费案例详解

2019-11-26 09:59:08

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本文实例讲述了Java使用抽象工厂模式实现的肯德基消费案例。分享给大家供大家参考，具体如下：

一、模式定义

抽象工厂模式提供了一个接口，用于创建相关或者依赖对象的家族，而不需要指定具体实现类。

抽象工厂模式允许客户使用抽象接口来创建一组相关的产品，客户类和工厂类分开，客户需要任何产品的时候，只需要向工厂请求即可，客户无须修改就可以获得新产品。

二、模式举例

1 模式分析

我们借用爸爸和儿子到肯德基店消费这一场景来说明这一模式，进行抽象分析后的截图如下

2 抽象工厂模式的静态建模

3 代码示例

3.1 抽象食物的建立

抽象食物――AbstractBaseFood

package com.demo.factory.model;/** * * 食物基类 * * @author maofw * */public abstract class AbstractBaseFood{  // 类别  protected String kind;  // 数量  protected int num;  // 价格  protected float price;  // 合计  public float totalPrice()  {    return this.num * this.price;  }}

食物接口――IFood

package com.demo.factory.model;/** * 抽象食物接口 * * @author maofw * */public interface IFood{  /**   * 打印输出食物信息   */  void printMesage();}

3.2 建立不同食物的抽象基类

汉堡基类――Hamburg

package com.demo.factory.model;/** * 汉堡基类 * * @author maofw * */public abstract class Hamburg extends AbstractBaseFood implements IFood{  public void printMesage()  {    System.out.println("--" + this.kind + "风味汉堡，/t单价：" + this.price + "，/t数量：" + this.num + "，/t合计：" + this.totalPrice());  }}

鸡翅基类――ChickenWings

package com.demo.factory.model;/** * 鸡翅基类 * * @author maofw * */public abstract class ChickenWings extends AbstractBaseFood implements IFood{  public void printMesage()  {    System.out.println("--" + this.kind + "风味鸡翅，/t单价：" + this.price + "，/t数量：" + this.num + "，/t合计：" + this.totalPrice());  }}

薯条基类――FrenchFries

package com.demo.factory.model;/** * 薯条基类 * * @author maofw * */public abstract class FrenchFries extends AbstractBaseFood implements IFood{  public void printMesage()  {    System.out.println("--" + this.kind + "风味薯条，/t单价：" + this.price + "，/t数量：" + this.num + "，/t合计：" + this.totalPrice());  }}

饮料基类――Beverage

package com.demo.factory.model;/** * 饮料基类 * * @author maofw * */public abstract class Beverage extends AbstractBaseFood implements IFood{  public void printMesage()  {    System.out.println("--" + this.kind + "饮料，/t单价：" + this.price + "，/t数量：" + this.num + "，/t合计：" + this.totalPrice());  }}

3.3 创建具体的食物

麻辣鸡腿汉堡――ChinaHanburm

package com.demo.factory.model.kfc;import com.demo.factory.model.Hamburg;/** * 中国风味的麻辣鸡腿汉堡 * * @author maofw * */public class ChinaHanburm extends Hamburg{  /**   * 构造方法   *   * @param kind   * @param price   * @param num   */  public ChinaHanburm(int num)  {    this.kind = "麻辣";    this.price = 14.0f;    this.num = num;  }}

奥尔良鸡翅――ChinaChickenWings

package com.demo.factory.model.kfc;import com.demo.factory.model.ChickenWings;/** * 鸡翅实现类 * * @author maofw * */public class ChinaChickenWings extends ChickenWings{  public ChinaChickenWings(int num)  {    this.kind = "奥尔良";    this.price = 2.5f;    this.num = num;  }}

薯条――ChinaFrenchFries

package com.demo.factory.model.kfc;import com.demo.factory.model.FrenchFries;/** * 薯条实现类 * * @author maofw * */public class ChinaFrenchFries extends FrenchFries{  public ChinaFrenchFries(int num)  {    this.kind = "普通";    this.price = 8.0f;    this.num = num;  }}

可乐――ChinaBeverage

package com.demo.factory.model.kfc;import com.demo.factory.model.Beverage;/** * 饮料实现类 * * @author maofw * */public class ChinaBeverage extends Beverage{  public ChinaBeverage(int num)  {    this.kind = "可乐";    this.price = 7.0f;    this.num = num;  }}

3.4 建立工厂

创建抽象肯德基工厂――IKfcFactory 生产抽象食物

package com.demo.factory.itf;import com.demo.factory.model.Beverage;import com.demo.factory.model.ChickenWings;import com.demo.factory.model.FrenchFries;import com.demo.factory.model.Hamburg;/** * 肯德基抽象工厂基类 * * @author maofw * */public interface IKfcFactory{  // 生产汉堡  public Hamburg createHamburg(int num);  // 生产薯条  public FrenchFries createFrenchFries(int num);  // 生产鸡翅  public ChickenWings createChickenWings(int num);  // 生产饮料  public Beverage createBeverage(int num);}

创建具体肯德基工厂――ChinaKfcFactory 生产具体食物

package com.demo.factory.itf;import com.demo.factory.model.Beverage;import com.demo.factory.model.ChickenWings;import com.demo.factory.model.FrenchFries;import com.demo.factory.model.Hamburg;import com.demo.factory.model.kfc.ChinaBeverage;import com.demo.factory.model.kfc.ChinaChickenWings;import com.demo.factory.model.kfc.ChinaFrenchFries;import com.demo.factory.model.kfc.ChinaHanburm;public class ChinaKfcFactory implements IKfcFactory{  // 生产可乐  public Beverage createBeverage(int num)  {    return new ChinaBeverage(num);  }  // 生产奥尔良烤鸡翅  public ChickenWings createChickenWings(int num)  {    return new ChinaChickenWings(num);  }  // 生产薯条  public FrenchFries createFrenchFries(int num)  {    return new ChinaFrenchFries(num);  }  // 生产麻辣风味鸡腿汉堡  public Hamburg createHamburg(int num)  {    return new ChinaHanburm(num);  }}

3.5 创建客户类――Customer

package com.demo.factory.custom;import com.demo.factory.itf.IKfcFactory;import com.demo.factory.model.Beverage;import com.demo.factory.model.ChickenWings;import com.demo.factory.model.FrenchFries;import com.demo.factory.model.Hamburg;/** * 客户类 * * @author maofw * */public class Customer{  // 抽象工厂  private IKfcFactory kfcFactory;  // 构造方法将抽象工厂作为参数传入  public Customer(IKfcFactory kfcFactory)  {    this.kfcFactory = kfcFactory;  }  /**   * 订购食物   */  // 订购麻辣鸡腿汉堡  public float orderHamburg(int num)  {    // 获得麻辣鸡腿汉堡    Hamburg hamburg = kfcFactory.createHamburg(num);    // 输出订购信息    hamburg.printMesage();    // 返回总价    return hamburg.totalPrice();  }  // 订购奥尔良烤鸡翅  public float orderChickenWings(int num)  {    // 获得奥尔良烤鸡翅    ChickenWings chickenWings = kfcFactory.createChickenWings(num);    // 输出订购信息    chickenWings.printMesage();    // 返回总价    return chickenWings.totalPrice();  }  // 订购薯条  public float orderFrenchFries(int num)  {    // 获得薯条    FrenchFries frenchFries = kfcFactory.createFrenchFries(num);    // 输出订购信息    frenchFries.printMesage();    // 返回总价    return frenchFries.totalPrice();  }  // 订购可乐  public float orderBeverage(int num)  {    // 获得可乐    Beverage beverage = kfcFactory.createBeverage(num);    // 输出订购信息    beverage.printMesage();    // 返回总价    return beverage.totalPrice();  }}

3.6 故事情节展现

package com.demo.factory;import java.lang.management.ManagementFactory;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLConnection;import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.SQLException;import java.text.NumberFormat;import java.util.Arrays;import java.util.Calendar;import java.util.ResourceBundle;import com.demo.factory.custom.Customer;import com.demo.factory.itf.ChinaKfcFactory;import com.demo.factory.itf.IKfcFactory;public class MainApp{  /**   * 主应用程序方法   *   * @param args   */  public static void main(String[] args)  {    /**     * 定义一个肯德基（IKfcFactory类型）     */    IKfcFactory kfcFactory = new ChinaKfcFactory();    /**     * 爸爸和儿子走进肯德基，准备点餐     */    Customer customer = new Customer(kfcFactory);    /**     * 开始点餐     */    // 一个麻辣鸡腿汉堡    float hamhurgMoney = customer.orderHamburg(1);    // 四个奥尔良烤鸡翅    float chickenWingsMoney = customer.orderChickenWings(4);    // 一包薯条    float frenchFriesMoney = customer.orderFrenchFries(1);    // 两杯可乐    float beverageMoney = customer.orderBeverage(2);    System.out.println("总计：" + (hamhurgMoney + chickenWingsMoney + frenchFriesMoney + beverageMoney));  }}

运行结果：