I have developed one frame on which I used GridBagLayout to arrange textfields of 12X12. i.e., total 144 textfields on frame. Now I want to differentiate these text fields with colored line after each 3 columns and three rows as shown in the following diagram. I shouldn't change the names of that text fields, because I interrelated those text fields using their names as jt, jt......jt........ and So on.I tried in many ways, but I couldn't find the solution. Please suggest. Below is the some part of my code. Thanks in advance.
Please consider the each number as one textfield in above diagram.