String stringNum1 = JOptionPane.showInputDialog(null, "enter 1st Integer: ");
        String stringNum2 = JOptionPane.showInputDialog(null, "enter 2nd Integer: ");
        String stringNum3 = JOptionPane.showInputDialog(null, "enter 3rd Integer: ");

        int num1 = Integer.parseInt(stringNum1);
        int num2 = Integer.parseInt(stringNum2);
        int num3 = Integer.parseInt(stringNum3);
        //sort the list
        String data = "This is the list from largest to smallest:\n";
        for (int i=0;i<4;i++)
         JOptionPane.showMessageDialog(null, data);