public static void main(String[] args) throws Exception {        DecimalFormat df = new DecimalFormat("#.00");        String re=df.format(23.8);        System.out.println(re);                String ss="23";        System.out.println(ensureDecimalPlaceOfMoney(ss));    }    public static String ensureDecimalPlaceOfMoney(String money){        if(money==null)            return null;        if(money.indexOf(".")!=-1){            String decimalPlace=money.substring(money.indexOf(".")+1, money.length());            if(decimalPlace.length()==1){                money+="0";            }        }else{            money+=".00";        }        return money;    }