抽象工厂模式

1.概述

提供一个创建一系列相关或相互依赖对象的接口,而无需指定它们具体的类。

2.适用性

1)一个系统要独立于它的产品的创建、组合和表示时

2)一个系统要由多个产品系列中的一个来配置时

3)当你要强调一系列相关的产品对象的设计以便进行联合使用时,

4)当你使用一个产品类库,而只想显示它们的接口而不是实现时,

3.参与者

1)AbstractFactory

声明一个创建抽象产品对象的操作接口

2)CreateFactory

实现创建具体产品对象的操作

3)AbstractProduct

为一类产品对象声明一个接口

4)CreateProduct

定义一个将被相应的具体工厂创建的产品对象,实现AbstractProduct

5)Client

仅使用由AbstractFactory和AbstractProduct类声明的接口

代码如下:

AbstractFactory包:

1 package abstractfactory;
2 
3 import abstractproduct.ICat;
4 import abstractproduct.IDog;
5 
6 public interface IAnimalFactory {
7     ICat createCat();
8     IDog createDog();
9 }

CreateFactory包:

package createfactory;

import createproduct.BlackCat;
import createproduct.BlackDog;
import abstractfactory.IAnimalFactory;
import abstractproduct.ICat;
import abstractproduct.IDog;

public class BlackAnimalFactory implements IAnimalFactory {

    @Override
    public ICat createCat() {
        // TODO Auto-generated method stub
        return new BlackCat();
    }

    @Override
    public IDog createDog() {
        // TODO Auto-generated method stub
        return new BlackDog();
    }

}



package createfactory;

import createproduct.whileDog;
import createproduct.whiteCat;
import abstractfactory.IAnimalFactory;
import abstractproduct.ICat;
import abstractproduct.IDog;

public class WhiteAnimalFactory implements IAnimalFactory {

    @Override
    public ICat createCat() {
        // TODO Auto-generated method stub
        return new whiteCat();
    }

    @Override
    public IDog createDog() {
        // TODO Auto-generated method stub
        return new whileDog();
    }

}

AbstractProduct包:

 1 package abstractproduct;
 2 
 3 public interface ICat {
 4     void eat();
 5 }
 6 
 7 
 8 
 9 package abstractproduct;
10 
11 public interface IDog {
12     void eat();
13 }

CreateProduct包:

 1 package createproduct;
 2 
 3 import abstractproduct.ICat;
 4 
 5 public class BlackCat implements ICat {
 6     public void eat(){
 7         System.out.println("the black cat is eating");
 8     }
 9 }
10 
11 
12 
13 package createproduct;
14 
15 import abstractproduct.IDog;
16 
17 public class BlackDog implements IDog {
18     public void eat(){
19         System.out.println("the black dog is eating");
20     }
21 }
22 
23 
24 
25 package createproduct;
26 
27 import abstractproduct.IDog;
28 
29 public class whileDog implements IDog {
30     public void eat(){
31         System.out.println("the white dog is eating");
32     }
33 }
34 
35 
36 
37 package createproduct;
38 
39 import abstractproduct.ICat;
40 
41 public class whiteCat implements ICat {
42     public void eat(){
43         System.out.println("the white cat is eating");
44     }
45 }

Client包:

 1 package client;
 2 
 3 import createfactory.BlackAnimalFactory;
 4 import createfactory.WhiteAnimalFactory;
 5 import abstractfactory.IAnimalFactory;
 6 import abstractproduct.ICat;
 7 import abstractproduct.IDog;
 8 
 9 public class Client {
10     
11     public static void main(String args[]){
12         IAnimalFactory blackAnimalFactory = new BlackAnimalFactory();
13         ICat blackCat = blackAnimalFactory.createCat();
14         blackCat.eat();
15         IDog blackDog = blackAnimalFactory.createDog();
16         blackDog.eat();
17         
18         IAnimalFactory whiteAnimalFactory = new WhiteAnimalFactory();
19         ICat whiteCat = whiteAnimalFactory.createCat();
20         whiteCat.eat();
21         IDog whiteDog = whiteAnimalFactory.createDog();
22         whiteDog.eat();
23     }
24 }

 

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