小白学习设计模式之工厂模式

工厂模式(运用在需要大量实例化对象的项目中):
    定义一个创建对象的类,由这个类来封装实例化对象的行为
工厂方法模式:
    定义一个创建对象的抽象方法,由子类来决定要实例化的类,工厂方法模式将对象的实例化推迟到了子类
抽象工厂模式:
    定义了一个接口用于创建相关或有依赖关系的对象族,而无需明确指定具体类

依赖抽象原则:
    变量不要持有具体类的引用
    不要让类继承自具体类,要继承自抽象类或接口
    不要覆盖基类中已实现的方法

首先抽象披萨类:

package com.wz.FiveFactory;

public abstract class Pizza {
   protected String name;
   
   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;
   }
}
不同国家不同口味的披萨:
伦敦:

package com.wz.FiveFactory;

public class LDPepperPizza extends Pizza {

   @Override
   public void prepare() {
      // TODO Auto-generated method stub
      super.setname("LDPepperPizza");
      
      System.out.println(name+" preparing;");
   }

}

package com.wz.FiveFactory;

public class LDCheesePizza extends Pizza {

   @Override
   public void prepare() {
      // TODO Auto-generated method stub
      super.setname("LDCheesePizza");
      
      System.out.println(name+" preparing;");
   }

}

纽约:

package com.wz.FiveFactory;

public class NYCheesePizza extends Pizza {

   @Override
   public void prepare() {
      // TODO Auto-generated method stub
      super.setname("NYCheesePizza");
      
      System.out.println(name+" preparing;");
   }

}

package com.wz.FiveFactory;

public class NYPepperPizza extends Pizza {

   @Override
   public void prepare() {
      // TODO Auto-generated method stub
      super.setname("NYPepperPizza");
      
      System.out.println(name+" preparing;");
   }

}
将国家设计为接口(工厂):

package com.wz.FiveFactory;


public interface AbsFactory {
   public Pizza CreatePizza(String ordertype) ;
}

伦敦:

package com.wz.FiveFactory;

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;

   }

}

纽约:

package com.wz.FiveFactory;

public class NYFactory implements AbsFactory {

   
   @Override
   public Pizza CreatePizza(String ordertype) {
      Pizza pizza = null;

      if (ordertype.equals("cheese")) {
         pizza = new NYCheesePizza();
      } else if (ordertype.equals("pepper")) {
         pizza = new NYPepperPizza();
      }
      return pizza;

   }

}

最后的测试:

package com.wz.FiveFactory;



public class PizzaStroe {
   public static void main(String[] args) {
      
      OrderPizza mOrderPizza;
      // 不同的国家在这体现
      mOrderPizza=new    OrderPizza(new LDFactory());
      
   }

   

}