JTable Column Max Number Doubt

Hello there,
I have this JTable Doubt. I have always been strugling with jtables and here I am stuck again and not able to do this.
My Database has defined a column that accepts a String Number. It can have upto 4 decimals and 2 fractional Numbers. So thats a total of 6 digits with a contraint as mentioned above.
I can have user input as 9999.99 and not 99999.9
Could you please tell me how I could have one of my JTables column to accept only input like this.
Regards,
Hemanth

It is not clear to me whether you are talking about rendering or editing.

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