copying tables(s) from on database instance to another

Hello All,
  I am trying to copy tables from 1 database instance(say DUMY) to another(TRNG). I used the command

copy from <user>/<passwd>@DUMY to <user>/<passwd>@TRNG create <table> using select * from <table>.

It created the table at the other instance(TRNG) but didnt populate it with data. I am not using Client-Server module. It is 1 Oracle server that I connect to and both my above-mentioned database instances reside on the same server.
If anyone can let me know what I need to modify in the above command or can suggest an alternative method(export/import ?), that would be great. I am new to DBA activities hence explanation in layman terms would be appreciated.
Thanks in advance !

• Rahul Dhond