SQL & PL/SQL :: Retrieving Records Where All The Rows Satisfies The Condition

I have to write a query which will get records only if all the rows satisfies the condition.

Output should retrieve only 'A' because all the values are '1' Where as for 'B' only two rows having value '1'.

create table table1(field1 varchar2(100), field2 varchar2(10));

insert into table1(field1,field2)values('A','1');
insert into table1(field1,field2)values('A','1');
insert into table1(field1,field2)values('A','1');
insert into table1(field1,field2)values('B','2');
insert into table1(field1,field2)values('B','2');
insert into table1(field1,field2)values('B','1');
insert into table1(field1,field2)values('B','1');
SELECT field1
FROM table1
WHERE field2=all(select '1' from dual)
FIELD1

A
A
A
B
B