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Not quite 100% sure if this will work, but you could try changing

//checks for incorrect values entered
if (minInt < 0) {
IllegalArgumentException exception
...

ActionListener eListener = new AddEnterListener();

AddActionListener is probably a void method.

I very highly doubt it returns an ActionListener or a subclass of ActionListener.

First off,

int[][] tArray = new int[index][2];

means

int [][] tArray = new int[0][2];

which means that there are 3 values in row 0 and no values in any other row.