Print out to the console

I'm writing a program to update something to the console. Let's say I have some fields like this:
client1 Name1 ID1 value1
client2 Name2 ID2 value2
the number of client could be changed, but not much. I would like to update the value field on the console, say, every 5 seconds.
How I could do that? It's much like some Linux/Unix program as top. System.out.println surely doesn't do the job.
Thanks in advance for your help.

Well, I'm new to gui application on linux. Couldyou
tell me in a few words how to do it? Which libraryI
should use? Thanks,Look into swing, it's a part of the standard library.Swing couldn't run on Linux/Unix without X server requirement. What I need is a terminal based application.

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