薛洪言的博客dao中存在是接口(interface)dao.impl中存在的是接口的具体实现(class)至于好处,去查查接口的定义。更新。。。。举个例子dao中有public interface UserDAO {public List getUser();}dao.imple中public class ...
weixin_39777543的博客dao中存在是接口(interface)dao.impl中存在的是接口的具体实现(class)至于好处,去查查接口的定义。更新。。。。举个例子dao中有public interface UserDAO {public List getUser();}dao.imple中public class ...