Double rounding in Java and setting the number of decimal places

This article is reproduced, the original address: http://blog.csdn.net/star_huang/article/details/7639267

Today you have an issue that requires you to keep a double of the decimal point for the data of type two. Centralized solution for online search, copy come on, spare

First Result_value is the double before processing

Get_double is used to save my processed double

//programme One:Get_double = (Double) (Math.Round (result_value*100)/100.0) //Scenario Two:DecimalFormat DF =NewDecimalFormat ("#.##"); Get_double=double.parsedouble (Df.format (Result_value));//Programme III:get_double = double.parsedouble (String.Format ("%.2f", Result_value));//Programme IV:BigDecimal BD =NewBigdecimalresult_value (); BigDecimal Bd2= Bd.setscale (2, BigDecimal. ROUND_HALF_UP); Get_double= Double.parsedouble (Bd2. ToString ());

PS: I solved the problem with the second solution.

Other

 Public Static int Scale ) {        double result = 0.0;         if (null ! = value)            {new  BigDecimal (string.valueof (value)). Setscale (Scale, ROUNDINGMODE.HALF_UP). Doublevalue ();        }         return result;

}

This method allows you to set the number of digits that are retained after the decimal point.