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You have no control over the console, its a completey different and independent program.
In java its only a PrintStream. You can re-route the output to anything else, so clearing doesnt make sense....

The program does not look OOP in the slightest. The methods are static (completely against OOP paradigm) and all code is put into one huge method that does everything.

You said you know how to...

What would the textfile be needed for?

I am sorry, but to be honest, I still dont exactly understand what the problem is.
I see that you know how to print something to screen. And you seem to...