工厂方法模式

工厂方法模式（Factory Method Pattern）

1.定义：定义一个创建产品对象的工厂接口，让子类决定实例化哪一种实例对象，即将实际创建实例对象的工作推迟到子类当中，核心工厂类不再负责具体产品的创建。

2.所遵循的设计原则：
a."开-闭"原则
b.依赖倒置原则

3.代码实现：
a.结构截图：

b.代码具体实现：
FruitFactory：

package com.feng.pattern.factory_method_pattern.factory;import com.feng.pattern.factory_method_pattern.product.AbstractFruit;public interface FruitFactory {  //水果工厂生产水果  AbstractFruit produceFurit();}

AppleFactory：

package com.feng.pattern.factory_method_pattern.factory;import com.feng.pattern.factory_method_pattern.product.AbstractFruit;import com.feng.pattern.factory_method_pattern.product.Apple;public class AppleFactory implements FruitFactory {public AbstractFruit produceFurit() {return new Apple();}}

PearFactory：

package com.feng.pattern.factory_method_pattern.factory;import com.feng.pattern.factory_method_pattern.product.AbstractFruit;import com.feng.pattern.factory_method_pattern.product.Pear;public class PearFactory implements FruitFactory {public AbstractFruit produceFurit() {return new Pear();}}

AbstractFruit:

package com.feng.pattern.factory_method_pattern.product;public abstract class AbstractFruit {//定义水果的名称private String name;public AbstractFruit(){}public AbstractFruit(String name) {this.name = name;}//获取水果的名称public String getName() {return name;}//设定水果的名称public void setName(String name) {this.name = name;}}

Apple:

package com.feng.pattern.factory_method_pattern.product;public class Apple extends AbstractFruit {public Apple() {super("Apple");}}

Pear:

package com.feng.pattern.factory_method_pattern.product;public class Pear extends AbstractFruit {public Pear() {super("Pear");}}

测试类FactoryMethodTest:

package junit.test;import org.junit.BeforeClass;import org.junit.Test;import com.feng.pattern.factory_method_pattern.factory.AppleFactory;import com.feng.pattern.factory_method_pattern.factory.FruitFactory;import com.feng.pattern.factory_method_pattern.factory.PearFactory;import com.feng.pattern.factory_method_pattern.product.AbstractFruit;public class FactoryMethodTest {@BeforeClasspublic static void setUpBeforeClass() throws Exception {}@Testpublic void produceApple(){FruitFactory factory = new AppleFactory();AbstractFruit fruit  = factory.produceFurit();System.out.println("工厂生产了"+fruit.getName());}@Testpublic void producePear(){FruitFactory factory = new PearFactory();AbstractFruit fruit  = factory.produceFurit();System.out.println("工厂生产了"+fruit.getName());}}