工厂类通用写法

来源：互联网发布：淘宝联盟怎么下单编辑：程序博客网时间：2024/05/16 17:33

package com.wang.yjs.business.qq.factory;

import com.wang.yjs.business.qq.dao.MsgDao;
import com.wang.yjs.business.qq.dao.UserDao;
import com.wang.yjs.business.qq.idao.IMsgDao;
import com.wang.yjs.business.qq.idao.IUserDao;

/**
* 工厂类负责动态装载UserDao类(工厂模式)
* @author
*/
public class DaoFactory {

private static DaoFactory instance;

private IUserDao iUserDao;
private IMsgDao iMsgDao;
private DaoFactory(){
  /**
   * 这里以后可以用配置文件动态装载
   */
  iUserDao = new UserDao();
  iMsgDao = new MsgDao();
}

/**
* 获得UserDaoFactory实例
* @return UserDaoFactory 实例
*/
public static synchronized DaoFactory getInstance(){
  if(instance == null){
   instance = new DaoFactory();
  }
  return instance;
}
/**
* 生产userDao实例
* @return userDao实例
*/
public IUserDao createUserDao(){
  return iUserDao;
}
/**
* 生产msgDao实例
* @return msgDao实例
*/
public IMsgDao createMsgDao(){
  return iMsgDao;
}
}