Problem Dropping Objects in Oracle XE using PL/SQL Developer

Hi all,
I am using PL/SQL Developer to access Oracle XE. I created some tables and later dropped them. But I still see some objects in the PL/SQL Developer Browser under the Tables section.
Below is the name of the objects in I see:
bin$fj7zj7y9rhqujmwrz1zmtg==$0,
bin$frxjknkot4cwtkexm4wtca==$0,
bin$q2m8wls+s72szfufb+mnzw==$0,
bin$syrcyj1bsqcelpfsodudrw==$0,
bin$tjt8ipk6ras8qtx0zvn+6w==$0,
bin$vc6dzazorg6zwemticqdha==$0,
bin$xfrxhcb3s5ev8wkjfc/3vg==$0,
bin$oyrdsi+us+yhhoprzdingq==$0,
bin$vtk7saqqtecbhmdwpnp1bg==$0,
bin$x1hhdhy+trmfponyldjwdw==$0
When I tried dropping these objects, I get ORA - 00933: SQL Command not properly ended. Error deleting bin$fj7zj7y9rhqujmwrz1zmtg==$0
How do I resolve this problem? And then drop all those objects listed above.
Is it possible to drop those objects at all?
Thanks in advance.
Sam.

There is no problem sofar. The objects you see are dropped objects ( if you drop it, oracle silently rename the object but preserve it as long you have sufficient space ).
You shouldn't drop them if you don't have issue with free space - they enable you to get back accidentally dropped table without to have restore the backup ( flashback table). If you are annoyed by displaying it in PL SQL Developer, you can just add a filter to not show them to you ( all objects like 'bin%' ) or you can update to newrer version of PL SQL Developer ( i've 7.0.0.1050 and it is displayed properly, all dropped objects can be found under recyclebin folder ). Finally , if you want purge them, use the 'purge recyclebin' command.
Best regards
Maxim

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