[hardwired]

Code:

int gridSquares;
do {
    String input = JOptionPane.showInputDialog(
        "Enter number of rows and columns you want grid to contain\n" +
        "(For example entering 2 will create a 2x2 grid)\n");

    gridSquares = Integer.parseInt( input );
    if(gridSquares < 1 || gridSquares > 5)
        JOptionPane.showMessageDialog(null, "Number must be between 1 and 5",
                                      "Input Error", JOptionPane.ERROR_MESSAGE);
} while(gridSquares < 1 || gridSquares > 5);