Digital formatting problems in Java development NumberFormat or DecimalFormat

The digital display can be formatted using NumberFormat or DecimalFormat

Import Java.text.decimalformat;import Java.text.numberformat;public class Testdemo {public static void main (string[]     args) {double a=0;     DecimalFormat DF =new DecimalFormat ("# # #0.000000");     System.out.println (Df.format (a));    NumberFormat NF = numberformat.getnumberinstance ();    Nf.setmaximumfractiondigits (6);      System.out.println (Nf.format (a)); }}

Digital formatting problems in Java development NumberFormat or DecimalFormat