Conversion Tool class between string, double, and long

 

Example

 

/** *  *  */public long getMoney_count_ms(){return this.money_count_ms;}/** *  *  */public void setMoney_count_ms(long money_count_ms){this.money_count_ms = money_count_ms;}public String getMoney_count_ms_str() {return NumberUtil.getLongToDouble(getMoney_count_ms());}public void setMoney_count_ms_str(String money_count_ms_str) {setMoney_count_ms(NumberUtil.setDoubleToLong(money_count_ms_str));}

 

 

Conversion Tool class between string, double, and long

 

/*** <PRE> * Conversion Tool class between string, double, and long ** @ comment: * 1, string --> double --> long * 2, long --> double --> long or double --> string ***/public class numberutil {public static double _ d_10000 = mongod; public static double _ d_100 = 100d; /*** <PRE> * string (30.58) to double (3058), * multiplied by 10000 (305800) *, and then converted to long (305800) * @ Param _ Str * @ return * </PRE> */public static long setdoubletolong (string _ Str) {string STR = numberutil. trim (_ Str); long _ long = 0; If ("". equals (STR) | "0 ". equals (STR) | "0.0 ". equals (STR) | "0.00 ". equals (STR) {_ long = 0;} else {double _ d = double. parsedouble (STR); _ long = (long) bigdecimalutil. mul (_ d, _ d_10000);} // system. out. println (_ long); Return _ long;}/*** <PRE> * long (305800,30000) converts double * by 10000 (30.58, 3). If no decimal point exists, convert it to long * and then convert it to string ** @ Param _ long * @ return * </PRE> */Public static string getlongtodouble (long _ long) {string _ STR = "0"; if (_ long = 0) {_ STR = "0 ";} else {double _ double = _ long; _ double = bigdecimalutil. div (_ double, _ d_10000); long _ = (long) _ long; _ long _ = _ long _/100l; _ long _ = _ long _/100l; if (_ double = _ long _) {_ STR = string. valueof (_ long _);} else {_ STR = string. valueof (_ double) ;}// system. out. println (_ Str); Return _ STR;}/*** test * @ par Am ARGs */public static void main (string [] ARGs) {numberutil. getlongtodouble (3000800); numberutil. setdoubletolong ("300.88");} public static string trim (string Str) {return (STR = NULL )? "": Str. Trim ());}}

 

Addition, subtraction, multiplication, and division of double type data

 

Import Java. math. bigdecimal;/*** <PRE> * Because Java's simple type cannot accurately perform floating-point operations, * this tool class provides precise floating-point operations, including addition, subtraction, multiplication, division, and rounding. * ** </PRE> */public class bigdecimalutil {/** default Division calculation precision */Private Static final int def_div_scale = 15; /** this class cannot be instantiated */private bigdecimalutil () {}/*** to provide precise addition operations. ** @ Param V1 * Add Number * @ Param V2 * Add Number * @ return and */public static double add (double V1, double V2) {bigdecimal b1 = new bigdecimal (double. tostring (V1); bigdecimal b2 = new bigdecimal (double. tostring (V2); Return b1.add (B2 ). doublevalue ();}/*** provides precise subtraction. ** @ Param V1 * subtrahend * @ Param V2 * subtrahend * @ Return Difference Between Two Parameters */public static double sub (double V1, double V2) {bigdecimal b1 = new bigdecimal (double. tostring (V1); bigdecimal b2 = new bigdecimal (double. tostring (V2); Return b1.subtract (B2 ). doublevalue ();}/*** provides exact multiplication. ** @ Param V1 * multiplier * @ Param V2 * multiplier * @ return product of two parameters */public static double MUL (double V1, double V2) {bigdecimal b1 = new bigdecimal (double. tostring (V1); bigdecimal b2 = new bigdecimal (double. tostring (V2); Return b1.multiply (B2 ). doublevalue ();}/*** provides (relatively) Precise Division operations. In case of Division, the Division is precise to 10 digits after the decimal point, and the subsequent digits are rounded down. ** @ Param V1 * divisor * @ Param V2 * divisor * @ return two parameters */public static double Div (double V1, double V2) {return Div (V1, v2, def_div_scale);}/*** provides (relatively) accurate Division operations. In case of division, the scale parameter determines the precision, and the subsequent numbers are rounded down. ** @ Param V1 * divisor * @ Param V2 * divisor * @ Param scale * indicates the number of digits after the decimal point. * @ Return operator of two parameters */public static double Div (double V1, double V2, int scale) {If (scale <0) {Throw new illegalargumentexception ("the scale must be a positive integer or zero");} bigdecimal b1 = new bigdecimal (double. tostring (V1); bigdecimal b2 = new bigdecimal (double. tostring (V2); Return b1.divide (B2, scale, bigdecimal. round_half_up ). doublevalue ();} public static void main (string [] ARGs) {double d = Bigdecimalutil. Div (3028800,100 00); system. Out. println (d);}/*** provides precise rounded decimal places. ** @ Param v * number to be rounded off * @ Param scale * number of digits to be retained after the decimal point * @ return result after rounding */public static double round (Double V, int scale) {If (scale <0) {Throw new illegalargumentexception ("the scale must be a positive integer or zero");} bigdecimal B = new bigdecimal (double. tostring (v); bigdecimal one = new bigdecimal ("1"); return B. divide (one, scale, bigdecimal. round_half_up ). doublevalue ();}}