2018-11-02 20:54:09 开始写
IFactory.java类（顶层）
1 package AbstractFactory; 2 3 public interface IFactory { 4 public IUser createUser(); 5 public IDepartment createDepartment(); 6 }
IUser.java类（下层）
1 package AbstractFactory; 2 3 public interface IUser { 4 public void insert(); 5 public void getById(); 6 }
IDepartment.java类（下层）
1 package AbstractFactory; 2 3 public interface IDepartment { 4 public void insert(); 5 public void getDepartmentById(); 6 }
AccessUser.java类
1 package AbstractFactory; 2 3 public class AccessDepartment implements IDepartment { 4 5 @Override 6 public void insert() { 7 // TODO Auto-generated method stub 8 System.out.println("insert department into sqlserver."); 9 } 10 11 @Override 12 public void getDepartmentById() { 13 // TODO Auto-generated method stub 14 System.out.println("get department in ssqlserver by id."); 15 } 16 17 }
AccessDepartment.java类
1 package AbstractFactory; 2 3 public class AccessDepartment implements IDepartment { 4 5 @Override 6 public void insert() { 7 // TODO Auto-generated method stub 8 System.out.println("insert department into sqlserver."); 9 } 10 11 @Override 12 public void getDepartmentById() { 13 // TODO Auto-generated method stub 14 System.out.println("get department in ssqlserver by id."); 15 } 16 17 }
AccessFactory.java类
1 package AbstractFactory; 2 3 public class AccessDepartment implements IDepartment { 4 5 @Override 6 public void insert() { 7 // TODO Auto-generated method stub 8 System.out.println("insert department into sqlserver."); 9 } 10 11 @Override 12 public void getDepartmentById() { 13 // TODO Auto-generated method stub 14 System.out.println("get department in ssqlserver by id."); 15 } 16 17 }
FactoryTest.java类
1 package AbstractFactory; 2 3 public class FactoryTest { 4 5 public static void main(String[] args) { 6 // TODO Auto-generated method stub 7 IFactory factory = new AccessFactory(); 8 IUser user = factory.createUser(); 9 IDepartment department = factory.createDepartment(); 10 user.insert(); 11 user.getById(); 12 department.insert(); 13 department.getDepartmentById(); 14 } 15 16 }
说明：
需要一个顶级接口、两个下层接口、两个实现下层接口的具体实现的类、1个顶层接口具体实现的类（用于创建下层接口具体实现的类）、主方法调用
IFactory factory = new AccessFactory();向上转型1次（顶层接口）（顶层接口中有两个抽象方法，下层的向上转型是同级别的）
IUser user = factory.createUser();向上转型1次（下层接口）
IDepartment department = factory.createDepartment();向上转型1次（下层接口）
user.insert();最后调用子类方法返回结果
user.getById();最后调用子类方法返回结果
department.insert();最后调用子类方法返回结果
department.getDepartmentById();最后调用子类方法返回结果
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原文：https://www.cnblogs.com/YUJIE666/p/9898474.html