抽象工厂模式

抽象工厂模式（Abstract Factory），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。

结构图：

代码如下：

 1 public class AbstractFactoryTest {
 2     public static void main(String[] args) {
 3         User user = new User();
 4         Department department = new Department();
 5         
 6         IUser iuser = DataAccess.createUser(); //直接得到数据访问实力，而不存在任何依赖
 7         iuser.insertUser(user);
 8         iuser.getUser("id");
 9         
10         IDepartment idepartment = DataAccess.createDepartment();
11         idepartment.insertDepartment(department);
12         idepartment.getDepartment("id");
13     }
14 
15 }

AbstractFactoryTest

 1 package com.cai.designMethods.abstractFactory;
 2 
 3 public class DataAccess {
 4     private static final String bd = "Sqlserver"; //数据库名 可换成Access
 5     
 6     public static IUser createUser(){
 7         IUser user = null;
 8         if("Sqlserver".equals(bd)){
 9             user = new SqlserverUser();
10         }else if("Access".equals(bd)){
11             user = new AccessUser();
12         }
13         return user;
14     }
15     
16     public static IDepartment createDepartment(){
17         IDepartment departmrnt = null;
18         if("Sqlserver".equals(bd)){
19             departmrnt = new SqlserverDepartment();
20         }else if("Access".equals(bd)){
21             departmrnt = new AccessDepartment();
22         }
23         return departmrnt;
24     }
25         
26 }

DataAccess

1 public interface IUser {
2     int insertUser(User user);
3     User getUser(String id);
4 
5 }

IUser

 1 public class AccessUser implements IUser {
 2 
 3     @Override
 4     public int insertUser(User user) {
 5         // TODO Auto-generated method stub
 6         return 0;
 7     }
 8 
 9     @Override
10     public User getUser(String id) {
11         // TODO Auto-generated method stub
12         return null;
13     }
14 
15 }

AccessUser

 1 public class SqlserverUser implements IUser {
 2 
 3     @Override
 4     public int insertUser(User user) {
 5         // TODO Auto-generated method stub
 6         return 0;
 7     }
 8 
 9     @Override
10     public User getUser(String id) {
11         // TODO Auto-generated method stub
12         return null;
13     }
14 
15 }

SqlserverUser

1 public interface IDepartment {
2     int insertDepartment(Department department);
3     User getDepartment(String id);
4 }

IDepartment

 1 public class AccessDepartment implements IDepartment {
 2 
 3     @Override
 4     public int insertDepartment(Department department) {
 5         return 0;
 6     }
 7 
 8     @Override
 9     public User getDepartment(String id) {
10         return null;
11     }
12 
13 }

AccessDepartment

 1 public class SqlserverDepartment implements IDepartment {
 2 
 3     @Override
 4     public int insertDepartment(Department department) {
 5         // TODO Auto-generated method stub
 6         return 0;
 7     }
 8 
 9     @Override
10     public User getDepartment(String id) {
11         // TODO Auto-generated method stub
12         return null;
13     }
14 
15 }

SqlserverDepartment

1 public class User {
2 
3 }

User

1 public class Department {
2 
3 }

Department