Question

In the code below, I am wondering why an exception will be thrown :

import java.text.*;
 class NumFormat
    {
      public static void main(String[] args)throws Exception{
      String s = "123.456xyz";
      NumberFormat nf = NumberFormat.getInstance();
      System.out.println(nf.parse(s));
      nf.setMaximumFractionDigits(2);
     System.out.println(nf.format(s));
    }
 }

Answer 1

format() expects a number to format, where as parse() returns a number from a string.

double n = nf.parse(s);
nf.setMaximumFractionDigits(2);
System.out.println(nf.format(n));

Will give you the result you were expecting.

References:

format() documentation

parse() documentation