CREATE and DROP TABLESPACE Oracle

Answer of @Allan correct but for more clarity, let me show my example

SQL> CREATE TEMPORARY TABLESPACE tbs_temp_01 
 2    TEMPFILE 'tbs_temp_01.dbf'
 3    SIZE 5M reuse
 4    AUTOEXTEND ON;

You can either login to the operating system and actually delete the file or add the reuse keyword after the size in your create tablespace command.