How to change string number to desired number decimal format

Below code helps to change the string number to desired number decimal format

String str="00000180000000";
BigDecimal number = new BigDecimal(str).divide(new BigDecimal("100"));// assign correct value

NumberFormat nf = NumberFormat.getCurrencyInstance(LocaleContextHolder.getLocale());
DecimalFormatSymbols decimalFormatSymbols = ((DecimalFormat) nf).getDecimalFormatSymbols();
decimalFormatSymbols.setCurrencySymbol("");
((DecimalFormat) nf).setDecimalFormatSymbols(decimalFormatSymbols);

String formatedNumber = nf.format(number);

Result :

1,800,000.00