DecimalFormat a = new DecimalFormat("#,###.000");
System.out.println(a.format(Long.MAX_VALUE));
System.out.println(a.format(Long.MIN_VALUE));
DecimalFormat a = new DecimalFormat("#,###.000");
System.out.println(a.format(Long.MAX_VALUE));
System.out.println(a.format(Long.MIN_VALUE));