大家好，我不知道代码中的问题在哪里，你能帮我吗。错误1:usersdao不是抽象的，并且不重写daolist中的抽象方法delete。错误2:方法不重写或实现父类型@override中的方法
usersdao.java文件：

public class Users extends db implements DaoList<Users>{
private static UsersDao userDao;
private UsersDao(){
}
public static UsersDao getInstance(){
    if(userDao == null){
        userDao = new UsersDao();
    }
    return userDao;
}
@Override
public List<UsersVo> loadAll(Users u) throws Exception {
    throw new UnsupportedOperationException("Not supported yet."); 
}
@Override
public int insert(Users u) throws Exception {
    Connection con = null;
    PreparedStatement ps = null;
    int count = 0;
    try{
    con = getConnection();
    String sql = "INSERT INTO USERS(USERNAME,PASSWORD,EMAIL) VALUES(?,?,?)";
    ps = con.prepareStatement(sql);
    ps.setString(1, u.getUserName());
    ps.setString(2, u.getPassWord());
    ps.setString(3, u.getEmail());
    count = ps.executeUpdate();
    }catch(Exception ex){
    }finally{
            ps.close();
            closeConnection(con);
    }
    return count;
}
@Override
public int update(Users u) throws Exception {
    throw new UnsupportedOperationException("Not supported yet."); 
}
@Override
public int delete(Users u) throws Exception {
    throw new UnsupportedOperationException("Not supported yet."); 
}
@Override
public PatientsVo getData(Users u) throws Exception {
    throw new UnsupportedOperationException("Not supported yet.");  
} }