MessageDialog working with DecimalFormat?

Code java:

---

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.

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

you can use a DecimalFormat:

DecimalFormat df = new DecimalFormat("0.00");

String formatedNum = df.format(savngsAc);