for exampe: oracle DBMS can create object type like this
create type Student as Object
( varchar2(6) idStudent,
varchar2(10 name,
char(1) sex
)
then oracle can create a table like this:
create table stu of Student
( Student s)

can hibernate map this table to Java class StudentCls?
class StudentCls
{
string id;
string name;
char sex;
.......
}

What does the SQL to INSERT / UPDATE / SELECT from stu look like?

If it looks sufficiently similar to a "normal" table, it should work fine.

there has some difference, for example, when INSERT, SQL statement should like this:
insert into stu values
( Student('123456', 'woo', 'm'));

it need a constructor(like Student(...)) to construct the object when insert a new row

but i can create tables like normal, for example:

create table stu
(
address VARCHAR2(20),
s Student
)

Student is the object type created for Object-Relation DBMS

when i select like this:
select * from stu;
it show:
ADDRESS S(ID, NAME, SEX)
----------------------------------------------------------------
tokyo STUDENT('001', 'woo', 'm')
yakada STUDENT('002', 'ray', 'm')

so can i hibernate map this table to Java class StudentCls?
[color=brown]class [/color]StudentCls
{
String id;
String name;
char sex;
String address;
.......
}

You could try writing a custom ClassPersister.