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Thread: MessageDialog working with DecimalFormat?

  1. #1
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    Default MessageDialog working with DecimalFormat?

    package internetserviceproviderpart2;
    import javax.swing.JOptionPane;
    /**
     *
     * @author Home
     */
    public class Main {
     
        /**
         * @param args the command line arguments
         */
        public static void main(String[] args) {
            String inputString;
            char packageLetter;
            int hoursUsed;
            int additionalHours = 0;
            double totalFee = 0;
            double savingAB = 0;
            double savingAC = 0;
            double savingBC = 0;
     
            inputString = JOptionPane.showInputDialog("Enter the letter of the " +
                    "package you purchased (either A, B, or C.)");
            inputString = inputString.toUpperCase();
            packageLetter = inputString.charAt(0);
     
            inputString = JOptionPane.showInputDialog("Enter the number of hours " +
                    "you used.");
            hoursUsed = Integer.parseInt(inputString);
     
            if (packageLetter=='A' && hoursUsed>10)
            {
                additionalHours = hoursUsed - 10;
                totalFee = 9.95 + (additionalHours * 2.00);
                savingAB = totalFee - 13.95;
                savingAC = totalFee - 19.95;
                JOptionPane.showMessageDialog(null,"Your monthly bill is $" +
                        totalFee + ".");
                if(packageLetter == 'A' && hoursUsed > 10 && totalFee > 19.95 && +
                        savingAB>0 && savingAC>0)
                JOptionPane.showMessageDialog(null,"You would save $" + savingAB +
                        " if you purchase Package B.");
                JOptionPane.showMessageDialog(null,"You would save $" + savingAC +
                        " if you purchase Package C.");
            }
            else if (packageLetter=='A' && hoursUsed<=10)
                JOptionPane.showMessageDialog(null,"Your monthly bill is $9.95.");
            else if (packageLetter=='B' && hoursUsed>20)
            {
                additionalHours = hoursUsed - 20;
                totalFee = 13.95 + (additionalHours * 1.00);
                savingBC = totalFee - 19.95;
                JOptionPane.showMessageDialog(null,"Your monthly bill is $" +
                        totalFee + ".");
                if (packageLetter == 'B' && hoursUsed > 20 && totalFee > 19.95 && +
                        savingBC>0)
                JOptionPane.showMessageDialog(null,"You would save $" + savingBC +
                        " if you purchase Package C.");
            }
            else if(packageLetter=='B' && hoursUsed<=20)
                JOptionPane.showMessageDialog(null,"Your monthly bill is $13.95.");
            else if (packageLetter=='C')
                JOptionPane.showMessageDialog(null,"Your monthly bill is $19.95.");
            else
                JOptionPane.showMessageDialog(null,"Enter either A, B, or C.");
     
            System.exit(0);
        }
    }

    Is it possible to use DecimalFormat while printing it out in a MessageDialog?
    e.g. I entered 'A' and '77' in this code and one of the MessageDialogs print out $123.99999999999

    I want to know if I can make that $123.999999999999999999 into $123.99.


  2. #2
    Member Darryl.Burke's Avatar
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    Default Re: MessageDialog working with DecimalFormat?

    Read the API for String and look for a method that returns a formatted version of the String.

    And shouldn't 123.999999999999999999 be represented as 124.00?

    db

  3. #3
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    Default Re: MessageDialog working with DecimalFormat?

    you can use a DecimalFormat:

    DecimalFormat df = new DecimalFormat("0.00");

    String formatedNum = df.format(savngsAc);

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