Double val = 0.00076833;
       String pattern = "(\\d+)([.0-9]{1,9})?";
       String s=(String.valueOf(                val)).replaceFirst(pattern,"$1$2");
       String f=(String.format(          "%.8f",val)).replaceFirst(pattern,"$1$2");
       String r=(String.format(Locale.US,"%.8f",val)).replaceFirst(pattern,"$1$2");
       String t = val.toString();
       System.out.println(s);
       System.out.println(f);
       System.out.println(r);
       System.out.println(t);

System.out.println(java.math.BigDecimal.valueOf(0.00076833).toPlainString());