retain two decimal digits.

 package kju.o;
 import static kju.print.Printer.*;
 import java.text.*;
 class MathDemo
 {
     public static void main(String[] args)
     {
         double d = 1.2458;
         println(round(d));    //prints:1.25
     }

     static String round(double d)
     {
         DecimalFormat nf = new DecimalFormat("#.00");
         return nf.format(d);    //retain two decimal digits.
     }
 }