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📜  Java.math.BigDecimal类

📅  最后修改于: 2020-11-14 05:59:33             🧑  作者: Mango

介绍

java.math.BigDecimal类提供用于算术，比例运算，舍入，比较，哈希和格式转换的操作。

toString()方法提供BigDecimal的规范表示。它使用户可以完全控制舍入行为。

提供了两种类型的操作来操纵BigDecimal的比例尺-

  • 缩放/舍入运算
  • 小数点运动运算

此类及其迭代器实现Comparable接口的所有可选方法。

类声明

以下是java.math.BigDecimal类的声明-

public class BigDecimal
   extends Number
      implements Comparable

领域

以下是java.math.BigDecimal类的字段-

  • 静态BigDecimal ONE-值1，小数位数为0。

  • static int ROUND_CEILING-舍入模式向正无穷大舍入。

  • static int ROUND_DOWN-舍入模式将舍入为零。

  • static int ROUND_FLOOR-舍入模式向负无穷大舍入。

  • static int ROUND_HALF_DOWN-舍入模式向“最近的邻居”舍入，除非两个邻居都等距，在这种情况下舍入。

  • static int ROUND_HALF_EVEN-舍入模式向“最近的邻居”舍入，除非两个邻居都等距，在这种情况下，向偶数邻居舍入。

  • static int ROUND_HALF_UP-舍入模式向“最近的邻居”舍入，除非两个邻居等距。

  • static int ROUND_UNNECESSARY-舍入模式，用于断言所请求的操作具有准确的结果，因此不需要舍入。

  • static int ROUND_UP-舍入模式从零舍入。

  • 静态BigDecimal TEN-值10，小数位数为0。

  • 静态BigDecimal零-值为0，小数位数为0。

类的构造函数

Sr.No. Constructor & Description
1

BigDecimal(BigInteger val)

This constructor is used to translates a BigInteger into a BigDecimal.
2

BigDecimal(BigInteger unscaledVal, int scale)

This constructor is used to translate a BigInteger unscaled value and an int scale into a BigDecimal.
3

BigDecimal(BigInteger unscaledVal, int scale, MathContext mc)

This constructor is used to translate a BigInteger unscaled value and an int scale into a BigDecimal, with rounding according to the context settings.
4

BigDecimal(BigInteger val, MathContext mc)

This constructor is used to translate a BigInteger into a BigDecimal rounding according to the context settings.
5

BigDecimal(char[ ] in)

This constructor is used to translate a character array representation of a BigDecimal into a BigDecimal, accepting the same sequence of characters as the BigDecimal(String) constructor.
6

BigDecimal(char[ ] in, int offset, int len)

This constructor is used to translate a character array representation of a BigDecimal into a BigDecimal, accepting the same sequence of characters as the BigDecimal(String) constructor, while allowing a sub-array to be specified.
7

BigDecimal(char[ ] in, int offset, int len, MathContext mc)

This constructor is used to translate a character array representation of a BigDecimal into a BigDecimal, accepting the same sequence of characters as the BigDecimal(String) constructor, while allowing a sub-array to be specified and with rounding according to the context settings.
8

BigDecimal(char[ ] in, MathContext mc)

This constructor is used to translate a character array representation of a BigDecimal into a BigDecimal, accepting the same sequence of characters as the BigDecimal(String) constructor and with rounding according to the context settings.
9

BigDecimal(double val)

This constructor is used to translates a double into a BigDecimal which is the exact decimal representation of the double’s binary floating-point value.
10

BigDecimal(double val, MathContext mc)

This constructor is used to translates a double into a BigDecimal, with rounding according to the context settings.
11

BigDecimal(int val)

This constructor is used to translates an int into a BigDecimal.
12

BigDecimal(int val, MathContext mc)

This constructor is used to translates an int into a BigDecimal, with rounding according to the context settings.
13

BigDecimal(long val)

This constructor is used to translate a long into a BigDecimal.
14

BigDecimal(long val, MathContext mc)

This constructor is used to translates a BigInteger into a BigDecimal.
15

BigDecimal(String val)

This constructor is used to the string representation of a BigDecimal into a BigDecimal.
16

BigDecimal(String val, MathContext mc)

This constructor is used to translates the string representation of a BigDecimal into a BigDecimal, accepting the same strings as the BigDecimal(String) constructor, with rounding according to the context settings.

类方法

Sr.No. Method & Description
1 BigDecimal abs()

This method returns a BigDecimal whose value is the absolute value of this BigDecimal, and whose scale is this.scale().
2 BigDecimal abs(MathContext mc)

This method returns a BigDecimal whose value is the absolute value of this BigDecimal, with rounding according to the context settings.
3 BigDecimal add(BigDecimal augend)

This method returns a BigDecimal whose value is (this + augend), and whose scale is max(this.scale(), augend.scale()).
4 BigDecimal add(BigDecimal augend, MathContext mc)

This method returns a BigDecimal whose value is (this + augend), with rounding according to the context settings.
5 byte byteValueExact()

This method converts the BigDecimal to a byte, checking for lost information.
6 int compareTo(BigDecimal val)

This method compares the BigDecimal with the specified BigDecimal.
7 BigDecimal divide(BigDecimal divisor)

This method returns a BigDecimal whose value is (this / divisor), and whose preferred scale is (this.scale() – divisor.scale()); if the exact quotient cannot be represented (because it has a non-terminating decimal expansion) an ArithmeticException is thrown.
8 BigDecimal divide(BigDecimal divisor, int roundingMode)

This method returns a BigDecimal whose value is (this / divisor), and whose scale is this.scale().
9 BigDecimal divide(BigDecimal divisor, int scale, int roundingMode)

This method returns a BigDecimal whose value is (this / divisor), and whose scale is as specified.
10 BigDecimal divide(BigDecimal divisor, int scale, RoundingMode roundingMode)

This method returns a BigDecimal whose value is (this / divisor), and whose scale is as specified.
11 BigDecimal divide(BigDecimal divisor, MathContext mc)

This method returns a BigDecimal whose value is (this / divisor), with rounding according to the context settings.
12 BigDecimal divide(BigDecimal divisor, RoundingMode roundingMode)

This method returns a BigDecimal whose value is (this / divisor), and whose scale is this.scale().
13 BigDecimal[ ] divideAndRemainder(BigDecimal divisor)

This method returns a two-element BigDecimal array containing the result of divideToIntegralValue followed by the result of remainder on the two operands.
14 BigDecimal[ ] divideAndRemainder(BigDecimal divisor, MathContext mc)

This method returns a two-element BigDecimal array containing the result of divideToIntegralValue followed by the result of remainder on the two operands calculated with rounding according to the context settings.
15 BigDecimal divideToIntegralValue(BigDecimal divisor)

This method returns a BigDecimal whose value is the integer part of the quotient (this / divisor) rounded down.
16 BigDecimal divideToIntegralValue(BigDecimal divisor, MathContext mc)

This method returns a BigDecimal whose value is the integer part of (this / divisor).
17 double doubleValue()

This method converts the BigDecimal to a double.
18 boolean equals(Object x)

This method compares the BigDecimal with the specified Object for equality.
19 float floatValue()

This method converts the BigDecimal to a float.
20 int hashCode()

This method returns the hash code for this BigDecimal.
21 int intValue()

This method converts the BigDecimal to an int.
22 int intValueExact()

This method converts the BigDecimal to an int, checking for lost information.
23 long longValue()

This method converts the BigDecimal to a long.
24 long longValueExact()

This method converts the BigDecimal to a long, checking for lost information.
25 BigDecimal max(BigDecimal val)

This method returns the maximum of this BigDecimal and val.
26 BigDecimal min(BigDecimal val)

This method returns the minimum of this BigDecimal and val.
27 BigDecimal movePointLeft(int n)

This method returns a BigDecimal which is equivalent to this one with the decimal point moved n places to the left.
28 BigDecimal movePointRight(int n)

This method returns a BigDecimal which is equivalent to this one with the decimal point moved n places to the right.
29 BigDecimal multiply(BigDecimal multiplicand)

This method returns a BigDecimal whose value is (this × multiplicand), and whose scale is (this.scale() + multiplicand.scale()).
30 BigDecimal multiply(BigDecimal multiplicand, MathContext mc)

This method returns a BigDecimal whose value is (this × multiplicand), with rounding according to the context settings.
31 BigDecimal negate()

This method returns a BigDecimal whose value is (+this), and whose scale is this.scale().
32 BigDecimal negate(MathContext mc)

This method returns a BigDecimal whose value is (-this), with rounding according to the context settings.
33 BigDecimal plus()

This method returns a BigDecimal whose value is (+this), and whose scale is this.scale().
34 BigDecimal plus(MathContext mc)

This method returns a BigDecimal whose value is (+this), with rounding according to the context settings.
35 BigDecimal pow(int n)

This method returns a BigDecimal whose value is (thisn), The power is computed exactly, to unlimited precision.
36 BigDecimal pow(int n, MathContext mc)

This method returns a BigDecimal whose value is (thisn).
37 int precision()

This method returns the precision of this BigDecimal.
38 BigDecimal remainder(BigDecimal divisor)

This method converts this BigDecimal to a byte, checking for lost information.
39 BigDecimal remainder(BigDecimal divisor, MathContext mc)

This method returns a BigDecimal whose value is (this % divisor), with rounding according to the context settings.
40 BigDecimal round(MathContext mc)

This method returns a BigDecimal rounded according to the MathContext settings.
41 int scale()

This method returns the scale of this BigDecimal.
42 BigDecimal scaleByPowerOfTen(int n)

This method returns a BigDecimal whose numerical value is equal to (this * 10n).
43 BigDecimal setScale(int newScale)

This method returns a BigDecimal whose scale is the specified value, and whose value is numerically equal to this BigDecimal’s.
44 BigDecimal setScale(int newScale, int roundingMode)

This method returns a BigDecimal whose scale is the specified value, and whose unscaled value is determined by multiplying or dividing this BigDecimal’s unscaled value by the appropriate power of ten to maintain its overall value.
45 BigDecimal setScale(int newScale, RoundingMode roundingMode)

This method returns a BigDecimal whose scale is the specified value, and whose unscaled value is determined by multiplying or dividing this BigDecimal’s unscaled value by the appropriate power of ten to maintain its overall value.
46 short shortValueExact()

This method converts the BigDecimal to a short, checking for lost information.
47 int signum()

This method returns the signum function of this BigDecimal.
48 BigDecimal stripTrailingZeros()

This method returns a BigDecimal which is numerically equal to this one but with any trailing zeros removed from the representation.
49 BigDecimal subtract(BigDecimal subtrahend)

This method returns a BigDecimal whose value is (this – subtrahend), and whose scale is max(this.scale(), subtrahend.scale()).
50 BigDecimal subtract(BigDecimal subtrahend, MathContext mc)

This method returns a BigDecimal whose value is (this – subtrahend), with rounding according to the context settings.
51 BigInteger toBigInteger()

This method converts the BigDecimal to a BigInteger.
52 BigInteger toBigIntegerExact()

This method converts the BigDecimal to a BigInteger, checking for lost information.
53 String toEngineeringString()

This method returns a string representation of this BigDecimal, using engineering notation if an exponent is needed.
54 String toPlainString()

This method returns a string representation of this BigDecimal without an exponent field.
55 String toString()

This method returns the string representation of this BigDecimal, using scientific notation if an exponent is needed.
56 BigDecimal ulp()

This method returns the size of an ulp, a unit in the last place, of this BigDecimal.
57 BigInteger unscaledValue()

This method returns a BigInteger whose value is the unscaled value of this BigDecimal.
58 static BigDecimal valueOf(double val)

This method translates a double into a BigDecimal, using the double’s canonical string representation provided by the Double.toString(double) method.
59 static BigDecimal valueOf(long val)

This method translates a long value into a BigDecimal with a scale of zero.
60 static BigDecimal valueOf(long unscaledVal, int scale)

This method translates a long unscaled value and an int scale into a BigDecimal.