Use of BigDecimal and currency for calculation of amount __java

Import Java.math.BigDecimal;

public class Bigdecimalutil {

/**

* Plus

*/

public static BigDecimal Add (DOUBLEV1, Double v2) {

BigDecimal B1 = new BigDecimal (v1.tostring ());

BigDecimal b2 = new BigDecimal (v2.tostring ());

Return B1.add (B2);

}

/**

* Minus

*/

public static BigDecimal Sub (DOUBLEV1, Double v2) {

BigDecimal B1 = new BigDecimal (v1.tostring ());

BigDecimal b2 = new BigDecimal (v2.tostring ());

Return B1.subtract (B2);

}

/**

* Multiply

*/

public static BigDecimal Mul (DOUBLEV1, Double v2) {

BigDecimal B1 = new BigDecimal (v1.tostring ());

BigDecimal b2 = new BigDecimal (v2.tostring ());

Return b1.multiply (B2);

}

/**

* except

*/

public static BigDecimal Div (DOUBLEV1, Double v2) {

BigDecimal B1 = new BigDecimal (v1.tostring ());

BigDecimal b2 = new BigDecimal (v2.tostring ());

Rounded, reserving two decimal places

Return B1.divide (B2, 2, Bigdecimal.round_half_down);

}

/**

*

* @param args

*/

Public staticvoid Main (string[] args) {

Double a=0.06;

Double b=0.01;

System.out.println (Add (a,b));

System.out.println (Sub (a,b));

System.out.println (Mul (a,b));

System.out.println (Div (a,b));

BigDecimal aa=new BigDecimal ("10.5");

BigDecimal bb=new BigDecimal ("10.50");

System.out.println (Aa.equals (BB));

System.out.println (134/100);

}

}

Use of 2BigDecimal
Some basic methods of BigDecimal, specific reference http://www.apihome.cn/api/java/BigDecimal.html

BigDecimal	ABS () Returns BigDecimal with the value of the BigDecimal, whose scale is This.scale ().
BigDecimal	ABS (Mathcontext MC) Returns the BigDecimal for this BigDecimal absolute value (rounded according to the context setting).
BigDecimal	Add (BigDecimal augend) Returns a BigDecimal with a value of (this + augend) with a scale of Max (This.scale (), Augend.scale ()).
BigDecimal	Add (BigDecimal augend, Mathcontext MC) Returns the BigDecimal whose value is (this + augend) (rounded according to the context setting).
Byte	Bytevalueexact () Convert this BigDecimal to byte to check for missing information.
Int	CompareTo (BigDecimal val) Compares this BigDecimal to the specified BigDecimal.
BigDecimal	Divide (BigDecimal divisor) Returns a BigDecimal with a value of (this/divisor) whose preferred scale is (This.scale ()-Divisor.scale ()), or if the exact quotient value cannot be represented (because it has an infinite decimal extension), Throws the ArithmeticException.
BigDecimal	Divide (BigDecimal divisor, int roundingmode) Returns a BigDecimal with a value of (this/divisor) with a scale of This.scale ().
BigDecimal	Divide (BigDecimal divisor, int scale, int roundingmode) Returns a BigDecimal with a value of (this/divisor) whose scale is the specified scale.
BigDecimal	Divide (BigDecimal divisor, int scale, Roundingmode roundingmode) Returns a BigDecimal with a value of (this/divisor) whose scale is the specified scale.
BigDecimal	Divide (BigDecimal divisor, Mathcontext MC) Returns the BigDecimal whose value is (this/divisor) (rounded according to the context setting).
BigDecimal	Divide (BigDecimal divisor, Roundingmode roundingmode) Returns a BigDecimal with a value of (this/divisor) with a scale of This.scale ().
Bigdecimal[]	Divideandremainder (BigDecimal divisor) Returns a two-element BigDecimal array that contains the results of the dividetointegralvalue followed by the remainder of the two operand calculations.
Bigdecimal[]	Divideandremainder (BigDecimal divisor, Mathcontext MC) Returns a two-element BigDecimal array that contains the results of the dividetointegralvalue, followed by the remainder result of rounding the two operands based on the context setting.
BigDecimal	Dividetointegralvalue (BigDecimal divisor) Returns BigDecimal, whose value is the integer portion of the quotient value (this/divisor) that is rounded down.
BigDecimal	Dividetointegralvalue (BigDecimal divisor, Mathcontext MC) Returns the BigDecimal, whose value is the integer portion of (this/divisor).
Double	Doublevalue () Converts this BigDecimal to double.
Boolean	Equals (Object x) Compares the equality of this BigDecimal with the specified Object.
Float	Floatvalue () Converts this BigDecimal to float.
Int	Hashcode () Returns the hash code for this BigDecimal.
Int	Intvalue () Converts this BigDecimal to an int.
Int	Intvalueexact () Convert this BigDecimal to int to check for missing information.
Long	Longvalue () Converts this BigDecimal to long.
Long	Longvalueexact () Converts this BigDecimal to long to check for missing information.
BigDecimal	Max (BigDecimal val) Returns the maximum value for this BigDecimal and Val.
BigDecimal	Min (BigDecimal val) Returns the minimum value for this BigDecimal and Val.
BigDecimal	Movepointleft (int n) Returns a BigDecimal, which is equivalent to moving the decimal point of the value to the left n bit.
BigDecimal	Movepointright (int n) Returns a BigDecimal, which is equivalent to moving the decimal point of the value to the right n bit.
BigDecimal	Multiply (BigDecimal multiplicand) Returns a BigDecimal with a value of (Thisxmultiplicand) with a scale of (This.scale () + Multiplicand.scale ()).
BigDecimal	Multiply (BigDecimal multiplicand, Mathcontext MC) Returns the BigDecimal whose value is (Thisxmultiplicand) (rounded according to the context setting).
BigDecimal	Negate () Returns BigDecimal with a value of (-this) with a scale of This.scale ().
BigDecimal	Negate (Mathcontext MC) Returns the BigDecimal whose value is (-this) (rounded according to the context setting).
BigDecimal	Plus () Returns BigDecimal with a value of (+this) with a scale of This.scale ().
BigDecimal	Plus (Mathcontext MC) Returns the BigDecimal whose value is (+this) (rounded according to the context setting).
BigDecimal	Pow (int n) Returns the BigDecimal whose value is (THISN) and accurately calculates the power so that it has infinite precision.