接口定义：
public interface DAO
{
public List getObjects(Class class); //get all objects
public Object getObject(Class class, Serializable id); //get one object
public void savaObject(Object o); //save one object
public void removeObject(Class class, Serializable id); //remove one object
}

接口定义：
public interface NewsDAO extends DAO
{
public News getNews(Long newsid);
public void saveNews(News news);
public void removeNews(Long newsId);
}

问题是，为什么接口继承不实现父接口定义的方法呢？ getNews<==>getObject ???