TYPE T1 IS TABLE OF <any type you want> 

SQL> DECLARE
  2      TYPE rt IS RECORD (
  3        col1 NUMBER,
  4        col2 NUMBER);
  5      TYPE t1
  6        IS TABLE OF RT INDEX BY BINARY_INTEGER;
  7      t T1;
  8  BEGIN
  9      FOR i IN 1..5 LOOP
 10          T(i).col1 := i;
 11
 12          T(i).col2 := i + 10;
 13      END LOOP;
 14
 15      FOR j IN t.first..t.last LOOP
 16          dbms_output.Put_line(T(j).col1
 17                               ||' - '
 18                               || T(j).col2);
 19      END LOOP;
 20  END;
 21
 22  /
1 - 11
2 - 12
3 - 13
4 - 14
5 - 15

PL/SQL procedure successfully completed.

SQL>

CREATE OR REPLACE
  TYPE obj_type
    AS OBJECT(
              id number,
              val varchar2(10),
              dt date
             )
/

Type created.

SET SERVEROUTPUT ON
DECLARE
    TYPE T1 IS TABLE OF obj_type INDEX BY BINARY_INTEGER;
    T T1;
BEGIN
    FOR I IN 1..3 LOOP
      T(I) := obj_type(I,'val ' || i,sysdate + i);
    END LOOP;
    FOR J IN T.FIRST..T.LAST LOOP
      DBMS_OUTPUT.PUT_LINE('ID = ' || T(J).id || ' val = ' || T(J).val || ' dt = ' || T(J).dt);
    END LOOP;
END;
/
ID = 1 val = val 1 dt = 02-MAR-13
ID = 2 val = val 2 dt = 03-MAR-13
ID = 3 val = val 3 dt = 04-MAR-13

PL/SQL procedure successfully completed.

SQL>