工厂模式小例子 getDaoImp

 

/**新建一个工厂类,创建dao层对象(单例模式)

*/

public class DaoFactory{

  private static DaoFactory daoFactory;//私有化自身

  private DaoFactory(){};//私有化构造方法

  static{

  if(daoFactory==null){

    synchronized(DaoFactory.class){

      If(daoFactory==null){

        daoFactory =new DaoFactory();

      }

    }

//工厂模式

public static ConDao getDaoImpl(String daoImpl){

  CanDao caodao = null;

  if (daoImpl.equals("DetailDaoImpl")) {
  caodao = new DetailDaoImpl();
  } else if (daoImpl.equals("NewsCotegoryDaoImpl")) {
  caodao = new NewsCotegoryDaoImpl();
  } else if (daoImpl.equals("NewDaoImp")) {
  caodao = new NewDaoImp();
  }

  return caodao;

  }

}

 

posted @ 2017-08-14 15:10  盛夏光年2017  阅读(204)  评论(0编辑  收藏  举报