String price = "";  // initialized the variable price to empty string
 
        ArrayList keypad = new ArrayList(); // create an arraylist and name it
                                                        // keypad
 
        while (true) // continuous loop to stop when arrayList is
                        // empty
        {
            try                     // read data from console
            {
                BufferedReader br =
                    new BufferedReader(new InputStreamReader(System.in), 1);
                System.out.println("Enter price");
                System.out.flush();
                price = br.readLine();
            }
 
            catch (IOException ioe) // if error then catch error
            {
                System.out.println(ioe);
            }
 
keypad.add(price);  // put data read from console into stack