import java.text.DecimalFormat;
	
    public class DecFormat
   {
       public static void main(String[] args)
      {
         DecimalFormat df = new DecimalFormat("0.00");
         DecimalFormat df2 = new DecimalFormat("0.0000");
         double d = 12.345678;
        
         System.out.println("my double with two decimal places: " + df.format(d));
         System.out.println("my double with four decimal places: " + df2.format(d));
      }
   }