How to create a command prompt in java ?

Hi,

I want to create a command prompt in java. I have a set of functions
in an application, the idea is to have the user input certain commands
on the prompt, based on which certain funcations can be called. To
make this more clear, suppose I have two functions for matrices add
and multiply. If A and B are two nxn matrices then the user can add
and multiply them as follow:

commandprompt> add A B
commandprompt> multiply A B

How can I design such a command prompt ? Is there any tutorial, I
tried searching on google but the links were of no use.

TIA,
Darth
.

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