Using DecimalFormat

I'm attempting to use an object of the DecimalFormat class. However, I'm continually receiving the following when I attempt to compile:

"cannot resolve symbol class DecimalFormat"

for the lines where I create a new DecimalFormat object. My code is as such:
------------------------------------------------------------------
public class DecimalFormatDemo
{
      public static void main(String[] args)
      {
            DecimalFormat twoDigitsPastPoint = new DecimalFormat("0.00");
            DecimalFormat threeDigitsPastPoint = new DecimalFormat("00.000");
            
                        
            double d = 12.3456789;
            System.out.println(twoDigitsPastPoint.format(d));
            System.out.println(threeDigitsPastPoint.format(d));
            

      }
}
-------------------------------------------------------------------------

Any ideas what I'm doing wrong??