java中的设计模式（三）--抽象工厂模式 反射机制

阅读本模式之前，请先熟悉简单工厂模式和工厂方法模式

1.定义人员类的接口

package com.dao;public interface People {public void cry();public void eat();public void jump();public void sex();}

 

2.定义三个抽象类，实现人员类接口

package com.dao;public abstract class AbstractYelloPeople implements People{public void cry() {// TODO Auto-generated method stubSystem.out.println("黄种人会哭");}public void eat() {// TODO Auto-generated method stub}public void jump() {// TODO Auto-generated method stub}}

 

package com.dao;public abstract class AbstractWhitePeople implements People{public void cry() {// TODO Auto-generated method stubSystem.out.println("白种人会哭");}public void eat() {// TODO Auto-generated method stub}public void jump() {// TODO Auto-generated method stub}}

 

package com.dao;public abstract class AbstractBlackPeople implements People{public void cry() {// TODO Auto-generated method stubSystem.out.println("黑种人会哭");}public void eat() {// TODO Auto-generated method stub}public void jump() {// TODO Auto-generated method stub}}

 

3.人员类的具体产品对象

package com.dao.impl;import com.dao.AbstractBlackPeople;public class BlackFamalePeople extends AbstractBlackPeople {public void sex() {System.out.println("该黑种人性别为女");}}

 

package com.dao.impl;import com.dao.AbstractBlackPeople;public class BlackMalePeople extends AbstractBlackPeople {public void sex() {System.out.println("该黑种人性别为男");}}

 

package com.dao.impl;import com.dao.AbstractWhitePeople;public class WhiteFamalePeople extends AbstractWhitePeople {public void sex() {System.out.println("该白种人性别为女");}}

 

package com.dao.impl;import com.dao.AbstractWhitePeople;public class WhiteMalePeople extends AbstractWhitePeople {public void sex() {System.out.println("该白种人性别为男");}}

 

package com.dao.impl;import com.dao.AbstractYelloPeople;public class YellowFamalePeople extends AbstractYelloPeople {public void sex() {System.out.println("该黄种人性别为女");}}

 

package com.dao.impl;import com.dao.AbstractYelloPeople;public class YellowMalePeople extends AbstractYelloPeople {public void sex() {System.out.println("该黄种人性别为男");}}

4.定义工厂接口

package com.dao;public interface Factory {public People createBlack();public People createYellow();public People createWhite();}

5.定义工厂的抽象类，实现工厂接口

package com.dao;public abstract class AbstractFactory implements Factory {private People people = null;public People createPeople (Class c){try {people = (People) Class.forName(c.getName()).newInstance();} catch (Exception e) {System.out.println("创建失败");}return people;}}

这里也可以根据传入的不同字符，实例化不同的产品对象

 

6.工厂的具体实现方法

package com.dao.impl;import com.dao.AbstractFactory;import com.dao.People;public class CreateMalePeople extends AbstractFactory {public People createYellow() {return super.createPeople(YellowMalePeople.class);}public People createWhite() {return super.createPeople(WhiteMalePeople.class);}public People createBlack() {return super.createPeople(BlackMalePeople.class);}}

 

package com.dao.impl;import com.dao.AbstractFactory;import com.dao.People;public class CreateFamalePeople extends AbstractFactory {public People createYellow() {return super.createPeople(YellowFamalePeople.class);}public People createWhite() {return super.createPeople(WhiteFamalePeople.class);}public People createBlack() {return super.createPeople(BlackFamalePeople.class);}}

6.客户端代码

import com.dao.Factory;import com.dao.People;import com.dao.impl.CreateFamalePeople;import com.dao.impl.CreateMalePeople;public class Test {public static void main(String[] args) {//第一条生产线，生产女人Factory maleFactory = new CreateMalePeople();//第二条生产线，生产男人Factory famaleFactory = new CreateFamalePeople();//开始造人--男人People yellowMalePeople = maleFactory.createYellow();yellowMalePeople.sex();People blackMalePeople = maleFactory.createBlack();blackMalePeople.sex();People whiteMalePeople = maleFactory.createWhite();whiteMalePeople.sex();//开始造人--女人People yellowFamalelePeople = famaleFactory.createYellow();yellowFamalelePeople.sex();People blackFamalePeople = famaleFactory.createBlack();blackFamalePeople.sex();People whiteFamalePeople = famaleFactory.createWhite();whiteFamalePeople.sex();}}

 

7.运行结果

该黄种人性别为男该黑种人性别为男该白种人性别为男该黄种人性别为女该黑种人性别为女该白种人性别为女

可以看到这里用到了抽象类，为什么要用？

简单说就是为了不让他实例化对象。想想，不管是什么肤色的人种，还没性别来，怎么能让他实例化啊。。。。。。

当然，人妖除外

代码分析：

首先要理解产品族和产品等级结构的概念，这个可以百度。

记住：每一个产品族中所包含的产品数目与产品等级结构的数目是一致的。