抽象工厂模式

因为详细工厂类。在一个应用中仅仅须要在初始化的时候出现一次。这就使得改变一个应用的详细工厂变得很easy，它仅仅须要改变详细工厂就可以使用不同的产品配置。

package gof23;

public class AbstractFactoryTest {
	public static void main(String[] args) throws InstantiationException, IllegalAccessException, ClassNotFoundException {
		//操作SqlServer数据库
		DataAccess.setFullyQualifiedName("gof23.Sqlserver");
		IUser user = DataAccess.createUser();
		user.insert(null);
		user.getUser(0);
		IDepartment dept = DataAccess.createDepartment();
		dept.insert(null);
		dept.getDept(0);
		System.out.println("\n"+"---------------我是华丽的切割线------------------"+"\n");
		//操作Mysql数据库
		DataAccess.setFullyQualifiedName("gof23.Mysql");
		user = DataAccess.createUser();
		user.insert(null);
		user.getUser(0);
		dept = DataAccess.createDepartment();
		dept.insert(null);
		dept.getDept(0);
	}
}

/*
 * 用户表的字段
 */
class User {
	private int id;
	private String name;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}

/*
 * 部门表的字段
 */
class Department {
	private int id;
	private String deptName;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getDeptName() {
		return deptName;
	}
	public void setDeptName(String deptName) {
		this.deptName = deptName;
	}
}

/*
 * 利用反射技术，去除switch或if，解除分支推断带来的耦合
 */
class DataAccess {
	private static String FullyQualifiedName;
	
	public static String getFullyQualifiedName() {
		return FullyQualifiedName;
	}

	public static void setFullyQualifiedName(String fullyQualifiedName) {
		FullyQualifiedName = fullyQualifiedName;
	}

	public static IUser createUser() throws InstantiationException, IllegalAccessException, ClassNotFoundException {
		String name = FullyQualifiedName + "User";
		return (IUser) Class.forName(name).newInstance();
	}
	
	public static IDepartment createDepartment() throws InstantiationException, IllegalAccessException, ClassNotFoundException {
		String name = FullyQualifiedName + "Department";
		return (IDepartment) Class.forName(name).newInstance();
	}
}

/*
 * 用户表的接口
 */
interface IUser{
	public void insert(User user);
	public User getUser(int id);
}

/*
 * Sqlserver用户表的实现
 */
class SqlserverUser implements IUser {

	@Override
	public void insert(User user) {
		System.out.println("在SQL server中给User表添加一条记录");
	}

	@Override
	public User getUser(int id) {
		System.out.println("在SQL server中依据ID得到User表一条记录");
		return null;
	}
	
}

/*
 * Mysql用户表的实现
 */
class MysqlUser implements IUser {

	@Override
	public void insert(User user) {
		System.out.println("在Mysql中给User表添加一条记录");
	}

	@Override
	public User getUser(int id) {
		System.out.println("在Mysql中依据ID得到User表一条记录");
		return null;
	}
	
}

/*
 * 部门表的接口
 */
interface IDepartment {
	public void insert(Department dep);
	public Department getDept(int id);
}

/*
 * Sqlserver部门表的实现
 */
class SqlserverDepartment implements IDepartment {

	@Override
	public void insert(Department dep) {
		System.out.println("在SQL server中给Department表添加一条记录");
	}

	@Override
	public Department getDept(int id) {
		System.out.println("在SQL server中依据ID得到Department表一条记录");
		return null;
	}
	
}

/*
 * Mysql部门表的实现
 */
class MysqlDepartment implements IDepartment {

	@Override
	public void insert(Department dep) {
		System.out.println("在Mysql中给Department表添加一条记录");
	}

	@Override
	public Department getDept(int id) {
		System.out.println("在Mysql中依据ID得到Department表一条记录");
		return null;
	}
	
}

在SQL server中给User表添加一条记录
在SQL server中依据ID得到User表一条记录
在SQL server中给Department表添加一条记录
在SQL server中依据ID得到Department表一条记录

---------------我是华丽的切割线------------------

在Mysql中给User表添加一条记录
在Mysql中依据ID得到User表一条记录
在Mysql中给Department表添加一条记录
在Mysql中依据ID得到Department表一条记录