四捨五入保留兩位小數

public static double numberRound(double num) {

if (num > 0) {

num += 0.0000001;

} else {

num -= 0.0000001;

}

BigDecimal b = new BigDecimal(num);

double f = b.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();

return f;

/*

 * long l=(long)((num+0.005)*100); return l/100.0;

 */

}