一,結構圖

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工廠類角色Creator (LightSimpleFactory)： 工廠類在客戶端的直接控制下（Create方法）創建產品對象。
抽象產品角色Product (Light)： 定義簡單工廠創建的對象的父類或它們共同擁有的接口。可以是一個類、抽象類或接口。
具體產品角色ConcreteProduct (BulbLight, TubeLight)： 定義工廠具體加工出的對象。

二，示例代碼

    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

??????在有些情況下Simple Factory可以由抽象產品角色扮演，一個抽象產品類同時是子類的工廠。

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    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");
   }
}
  

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簡單工廠(Simple Factory Pattern)模式