±£ÁôÁ½Î»Ð¡Êý£¬²»ËÄÉáÎåÈë

DecimalFormat formater = new DecimalFormat();

formater.setMaximumFractionDigits(2);

formater.setGroupingSize(0);

formater.setRoundingMode(RoundingMode.FLOOR);

System.out.println(formater.format(123456.7897456));