Thread: Decimal formatting?

my program is supposed to include The three sides of the triangle formatted to two decimal places The perimeter formatted to one decimal place The area formatted to one decimal place The unformatted area. It does run, but it is not decimal formatted. I have read my book to try and figure out how to do this, but it doesn't make since to me. Can someone tell me how I would do this?

 
import javax.swing.JOptionPane;
import java.util.*;
import java.text.DecimalFormat;
import java.util.StringTokenizer;
 
public class ShelbyHarms_3_03 {
   public static void main (String [] args) {
   double a, b, c; //Input sides of triangle
   double x; //Perimeter of triangle
   double area; //Area of triangle
   String inputStr;
   StringTokenizer st;
 
 
   //Enter sides of the triangle separated by spaces
   inputStr = JOptionPane.showInputDialog("Enter sides of the triangle separated by spaces");
   st = new StringTokenizer(inputStr);
   a = Double.parseDouble(st.nextToken());
   b = Double.parseDouble(st.nextToken());
   c = Double.parseDouble(st.nextToken());
 
 
   DecimalFormat formatter = new DecimalFormat("0.00");
 
   JOptionPane.showMessageDialog(null,"Your three triangle lengths are: " + '\n' + a +
           '\n' + b + '\n' + c);
 
   JOptionPane.showMessageDialog(null,"The area of your triangle is: " +
           ShelbyHarms302.triangleArea(a, b, c));
 
    }
 
    public static double triangleArea (double a, double b, double c) {
      double s = (a + b + c)/2.0;
      double x = ((s) * (s-a) * (s-b) * (s-c)); 
      double area = Math.sqrt(x);
      return area;     
 
    } // End main()
} // End class

Originally Posted by Junky

I see in your code you create a DecimalFormat object. I don't see where you use it!

I think that's my problem. I don't understand how to use it in this code.

--- Update ---

Originally Posted by Junky

I see in your code you create a DecimalFormat object. I don't see where you use it!

would it be something like this?

   JOptionPane.showMessageDialog(null, formatter.format(a, b, c));
   JOptionPane.showMessageDialog(null, formatter.format(s));
   JOptionPane.showMessageDialog(null, formatter.format(area));

--- Update ---

Never mind figured it out. I'm still pretty new to this. I am just wondering now how I might get the The three sides of the triangle formatted to two decimal places The perimeter formatted to one decimal place The area formatted to one decimal place and The unformatted area into one dialog box?