float四舍五入保留两位小数

/*** float四舍五入保留两位小数* */public static float formatDecimal(float n) {return (Math.round(n * 100)) / 100f;}

double四舍五入保留两位小数

/*** double四舍五入保留两位小数* */public static double formatDecimal(double n) {return (Math.round(n * 100)) / 100d;}

BigDecimal向上取整

/*** BigDecimal向上取整* */public static BigDecimal formatUpRounding(BigDecimal b) {return b.setScale(0, BigDecimal.ROUND_UP);}

BigDecimal向下取整

/*** BigDecimal向下取整* */public static BigDecimal formatDownRounding(BigDecimal b) {return b.setScale(0, BigDecimal.ROUND_DOWN);}

BigDecimal四舍五入取整

/*** BigDecimal四舍五入取整* */public static BigDecimal formatRounding(BigDecimal b) {return b.setScale(0, BigDecimal.ROUND_HALF_EVEN);}

BigDecimal保留两位小数   转换成float

/*** BigDecimal四舍五入保留两位小数 转float* */public static float toFloat(BigDecimal b){return b.setScale(2).floatValue();}

BigDecimal转换成String

/*** BigDecimal to String* */public static String toString(BigDecimal b) {return b.toPlainString();}