简单工厂(Simple Factory Pattern)模式

一,结构图

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

工厂类角色Creator (LightSimpleFactory)： 工厂类在客户端的直接控制下（Create方法）创建产品对象。
抽象产品角色Product (Light)： 定义简单工厂创建的对象的父类或它们共同拥有的接口。可以是一个类、抽象类或接口。
具体产品角色ConcreteProduct (BulbLight, TubeLight)： 定义工厂具体加工出的对象。

二，示例代码

    public interface Light {
   public void turnOn();
   public void turnOff();
}

public class BulbLight implements Light {
   public void turnOn() {
      System.out.printLn("Bulb Light is Turned on");
   }
   public void turnOff() {
      System.out.printLn("Bulb Light is Turned off");
   }
}

public class TubeLight implements Light {
   public void turnOn() {
      System.out.printLn("Tube Light is Turned on");
   }
   public void turnOff() {
      System.out.printLn("Tube Light is Turned off");
   }
}

public class LightSimpleFactory {
   public Light Create(string lightType) {
      if(lightType == "Bulb")
         return new BulbLight();
      else if(lightType == "Tube")
         return new TubeLight();
      else
         return null;
   }
}

  

三，演化

      在有些情况下Simple Factory可以由抽象产品角色扮演，一个抽象产品类同时是子类的工厂。

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    public abstract class Light {
   public abstract void TurnOn();
   public abstract void TurnOff();

   public static Light create(string lightType)
   {
      if(lightType == "Bulb")
         return new BulbLight();
      else if(lightType == "Tube")
         return new TubeLight();
      else
         return null;
   }
}

public class BulbLight extends Light {
   public void turnOn() {
      System.out.printLn("Bulb Light is Turned on");
   }
   public void turnOff() {
      System.out.printLn("Bulb Light is Turned off");
   }
}

public class TubeLight extends Light {
   public void turnOn() {
      System.out.printLn("Tube Light is Turned on");
   }

   public void TurnOff() {
      System.out.printLn("Tube Light is Turned off");
   }
}
  

 

简单工厂(Simple Factory Pattern)模式