This self-concatenating method is much better than the shell-based solution I wrote about a few years ago.
set heading off
set pagesize 0
select 'drop '||object_type||' '|| object_name|| DECODE(OBJECT_TYPE,'TABLE',' CASCADE CONSTRAINTS','') || ';' from user_objects;
Execute the output, then
purge recyclebin;
select * from user_objects
Very satisfying. Much less fiddly.
