设计模式---工场方法模式

工场模式由抽象工场模式衍生而来，工场模式同样是由工场来创建类的实例，不同之处在于这里需要新建工场的实例，但是这种情况会存在一个缺点就是每个品种都会创建一个新的工场，容易造成工场泛滥，好处是可以很方便的扩展产品

首先创建food和它的继承类

package com.zcj.factorypattern;

public abstract class Food {
public abstract void print();
}

package com.zcj.factorypattern;

public class Rice extends Food {

@Override
public void print() {
// TODO Auto-generated method stub
System.out.println("i am rice");
}

}

package com.zcj.factorypattern;

public class Apple extends Food{

@Override
public void print() {
// TODO Auto-generated method stub
System.out.println("i am apple");
}

}

然后创建食物工场，和对应的食物工场实现类

package com.zcj.factorypattern;

public abstract class FoodFactory {
public abstract Food createFood();
}

package com.zcj.factorypattern;

public abstract class FoodFactory {
public abstract Food createFood();
}

package com.zcj.factorypattern;

public class AppleFactory extends FoodFactory {

@Override
public Food createFood() {
// TODO Auto-generated method stub
return new Apple();
}

}

最后是我们的测试类，注意上面工场来创建食物的时候没有使用反射

package com.zcj.factorypattern;

public class FactoryTest {
public static void main(String[] args) {
FoodFactory factory = new RiceFactory();
//FoodFactory factory = new AppleFactory();
Food food = factory.createFood();
food.print();
}
}