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Class Math

java.lang.Object
- java.lang.Math

```
public final classMathextendsObject
```
The classMath contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.
Unlike some of the numeric methods of classStrictMath, all implementations of the equivalent functions of classMath are not defined to return the bit-for-bit same results. This relaxation permits better-performing implementations where strict reproducibility is not required.
By default many of theMath methods simply call the equivalent method inStrictMath for their implementation. Code generators are encouraged to use platform-specific native libraries or microprocessor instructions, where available, to provide higher-performance implementations ofMath methods. Such higher-performance implementations still must conform to the specification forMath.
The quality of implementation specifications concern two properties, accuracy of the returned result and monotonicity of the method. Accuracy of the floating-pointMath methods is measured in terms ofulps, units in the last place. For a given floating-point format, anulp of a specific real number value is the distance between the two floating-point values bracketing that numerical value. When discussing the accuracy of a method as a whole rather than at a specific argument, the number of ulps cited is for the worst-case error at any argument. If a method always has an error less than 0.5 ulps, the method always returns the floating-point number nearest the exact result; such a method iscorrectly rounded. A correctly rounded method is generally the best a floating-point approximation can be; however, it is impractical for many floating-point methods to be correctly rounded. Instead, for theMath class, a larger error bound of 1 or 2 ulps is allowed for certain methods. Informally, with a 1 ulp error bound, when the exact result is a representable number, the exact result should be returned as the computed result; otherwise, either of the two floating-point values which bracket the exact result may be returned. For exact results large in magnitude, one of the endpoints of the bracket may be infinite. Besides accuracy at individual arguments, maintaining proper relations between the method at different arguments is also important. Therefore, most methods with more than 0.5 ulp errors are required to besemi-monotonic: whenever the mathematical function is non-decreasing, so is the floating-point approximation, likewise, whenever the mathematical function is non-increasing, so is the floating-point approximation. Not all approximations that have 1 ulp accuracy will automatically meet the monotonicity requirements.
The platform uses signed two's complement integer arithmetic with int and long primitive types. The developer should choose the primitive type to ensure that arithmetic operations consistently produce correct results, which in some cases means the operations will not overflow the range of values of the computation. The best practice is to choose the primitive type and algorithm to avoid overflow. In cases where the size isint orlong and overflow errors need to be detected, the methodsaddExact,subtractExact,multiplyExact, andtoIntExact throw anArithmeticException when the results overflow. For other arithmetic operations such as divide, absolute value, increment by one, decrement by one, and negation, overflow occurs only with a specific minimum or maximum value and should be checked against the minimum or maximum as appropriate.
Since:
1.0

Field Summary

Fields
Modifier and Type	Field	Description
`static double`	`E`	The`double` value that is closer than any other toe, the base of the natural logarithms.
`static double`	`PI`	The`double` value that is closer than any other topi, the ratio of the circumference of a circle to its diameter.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static double`	`abs(double a)`	Returns the absolute value of a`double` value.
`static float`	`abs(float a)`	Returns the absolute value of a`float` value.
`static int`	`abs(int a)`	Returns the absolute value of an`int` value.
`static long`	`abs(long a)`	Returns the absolute value of a`long` value.
`static double`	`acos(double a)`	Returns the arc cosine of a value; the returned angle is in the range 0.0 throughpi.
`static int`	`addExact(int x, int y)`	Returns the sum of its arguments, throwing an exception if the result overflows an`int`.
`static long`	`addExact(long x, long y)`	Returns the sum of its arguments, throwing an exception if the result overflows a`long`.
`static double`	`asin(double a)`	Returns the arc sine of a value; the returned angle is in the range -pi/2 throughpi/2.
`static double`	`atan(double a)`	Returns the arc tangent of a value; the returned angle is in the range -pi/2 throughpi/2.
`static double`	`atan2(double y, double x)`	Returns the angletheta from the conversion of rectangular coordinates (`x`, `y`) to polar coordinates (r, theta).
`static double`	`cbrt(double a)`	Returns the cube root of a`double` value.
`static double`	`ceil(double a)`	Returns the smallest (closest to negative infinity)`double` value that is greater than or equal to the argument and is equal to a mathematical integer.
`static double`	`copySign(double magnitude, double sign)`	Returns the first floating-point argument with the sign of the second floating-point argument.
`static float`	`copySign(float magnitude, float sign)`	Returns the first floating-point argument with the sign of the second floating-point argument.
`static double`	`cos(double a)`	Returns the trigonometric cosine of an angle.
`static double`	`cosh(double x)`	Returns the hyperbolic cosine of a`double` value.
`static int`	`decrementExact(int a)`	Returns the argument decremented by one, throwing an exception if the result overflows an`int`.
`static long`	`decrementExact(long a)`	Returns the argument decremented by one, throwing an exception if the result overflows a`long`.
`static double`	`exp(double a)`	Returns Euler's numbere raised to the power of a`double` value.
`static double`	`expm1(double x)`	Returnse^x -1.
`static double`	`floor(double a)`	Returns the largest (closest to positive infinity)`double` value that is less than or equal to the argument and is equal to a mathematical integer.
`static int`	`floorDiv(int x, int y)`	Returns the largest (closest to positive infinity)`int` value that is less than or equal to the algebraic quotient.
`static long`	`floorDiv(long x, int y)`	Returns the largest (closest to positive infinity)`long` value that is less than or equal to the algebraic quotient.
`static long`	`floorDiv(long x, long y)`	Returns the largest (closest to positive infinity)`long` value that is less than or equal to the algebraic quotient.
`static int`	`floorMod(int x, int y)`	Returns the floor modulus of the`int` arguments.
`static int`	`floorMod(long x, int y)`	Returns the floor modulus of the`long` and`int` arguments.
`static long`	`floorMod(long x, long y)`	Returns the floor modulus of the`long` arguments.
`static double`	`fma(double a, double b, double c)`	Returns the fused multiply add of the three arguments; that is, returns the exact product of the first two arguments summed with the third argument and then rounded once to the nearest`double`.
`static float`	`fma(float a, float b, float c)`	Returns the fused multiply add of the three arguments; that is, returns the exact product of the first two arguments summed with the third argument and then rounded once to the nearest`float`.
`static int`	`getExponent(double d)`	Returns the unbiased exponent used in the representation of a`double`.
`static int`	`getExponent(float f)`	Returns the unbiased exponent used in the representation of a`float`.
`static double`	`hypot(double x, double y)`	Returns sqrt(x² +y²) without intermediate overflow or underflow.
`static double`	`IEEEremainder(double f1, double f2)`	Computes the remainder operation on two arguments as prescribed by the IEEE 754 standard.
`static int`	`incrementExact(int a)`	Returns the argument incremented by one, throwing an exception if the result overflows an`int`.
`static long`	`incrementExact(long a)`	Returns the argument incremented by one, throwing an exception if the result overflows a`long`.
`static double`	`log(double a)`	Returns the natural logarithm (basee) of a`double` value.
`static double`	`log10(double a)`	Returns the base 10 logarithm of a`double` value.
`static double`	`log1p(double x)`	Returns the natural logarithm of the sum of the argument and 1.
`static double`	`max(double a, double b)`	Returns the greater of two`double` values.
`static float`	`max(float a, float b)`	Returns the greater of two`float` values.
`static int`	`max(int a, int b)`	Returns the greater of two`int` values.
`static long`	`max(long a, long b)`	Returns the greater of two`long` values.
`static double`	`min(double a, double b)`	Returns the smaller of two`double` values.
`static float`	`min(float a, float b)`	Returns the smaller of two`float` values.
`static int`	`min(int a, int b)`	Returns the smaller of two`int` values.
`static long`	`min(long a, long b)`	Returns the smaller of two`long` values.
`static int`	`multiplyExact(int x, int y)`	Returns the product of the arguments, throwing an exception if the result overflows an`int`.
`static long`	`multiplyExact(long x, int y)`	Returns the product of the arguments, throwing an exception if the result overflows a`long`.
`static long`	`multiplyExact(long x, long y)`	Returns the product of the arguments, throwing an exception if the result overflows a`long`.
`static long`	`multiplyFull(int x, int y)`	Returns the exact mathematical product of the arguments.
`static long`	`multiplyHigh(long x, long y)`	Returns as a`long` the most significant 64 bits of the 128-bit product of two 64-bit factors.
`static int`	`negateExact(int a)`	Returns the negation of the argument, throwing an exception if the result overflows an`int`.
`static long`	`negateExact(long a)`	Returns the negation of the argument, throwing an exception if the result overflows a`long`.
`static double`	`nextAfter(double start, double direction)`	Returns the floating-point number adjacent to the first argument in the direction of the second argument.
`static float`	`nextAfter(float start, double direction)`	Returns the floating-point number adjacent to the first argument in the direction of the second argument.
`static double`	`nextDown(double d)`	Returns the floating-point value adjacent to`d` in the direction of negative infinity.
`static float`	`nextDown(float f)`	Returns the floating-point value adjacent to`f` in the direction of negative infinity.
`static double`	`nextUp(double d)`	Returns the floating-point value adjacent to`d` in the direction of positive infinity.
`static float`	`nextUp(float f)`	Returns the floating-point value adjacent to`f` in the direction of positive infinity.
`static double`	`pow(double a, double b)`	Returns the value of the first argument raised to the power of the second argument.
`static double`	`random()`	Returns a`double` value with a positive sign, greater than or equal to`0.0` and less than`1.0`.
`static double`	`rint(double a)`	Returns the`double` value that is closest in value to the argument and is equal to a mathematical integer.
`static long`	`round(double a)`	Returns the closest`long` to the argument, with ties rounding to positive infinity.
`static int`	`round(float a)`	Returns the closest`int` to the argument, with ties rounding to positive infinity.
`static double`	`scalb(double d, int scaleFactor)`	Returns`d` × 2^scaleFactor rounded as if performed by a single correctly rounded floating-point multiply to a member of the double value set.
`static float`	`scalb(float f, int scaleFactor)`	Returns`f` × 2^scaleFactor rounded as if performed by a single correctly rounded floating-point multiply to a member of the float value set.
`static double`	`signum(double d)`	Returns the signum function of the argument; zero if the argument is zero, 1.0 if the argument is greater than zero, -1.0 if the argument is less than zero.
`static float`	`signum(float f)`	Returns the signum function of the argument; zero if the argument is zero, 1.0f if the argument is greater than zero, -1.0f if the argument is less than zero.
`static double`	`sin(double a)`	Returns the trigonometric sine of an angle.
`static double`	`sinh(double x)`	Returns the hyperbolic sine of a`double` value.
`static double`	`sqrt(double a)`	Returns the correctly rounded positive square root of a`double` value.
`static int`	`subtractExact(int x, int y)`	Returns the difference of the arguments, throwing an exception if the result overflows an`int`.
`static long`	`subtractExact(long x, long y)`	Returns the difference of the arguments, throwing an exception if the result overflows a`long`.
`static double`	`tan(double a)`	Returns the trigonometric tangent of an angle.
`static double`	`tanh(double x)`	Returns the hyperbolic tangent of a`double` value.
`static double`	`toDegrees(double angrad)`	Converts an angle measured in radians to an approximately equivalent angle measured in degrees.
`static int`	`toIntExact(long value)`	Returns the value of the`long` argument; throwing an exception if the value overflows an`int`.
`static double`	`toRadians(double angdeg)`	Converts an angle measured in degrees to an approximately equivalent angle measured in radians.
`static double`	`ulp(double d)`	Returns the size of an ulp of the argument.
`static float`	`ulp(float f)`	Returns the size of an ulp of the argument.

Methods inherited from class java.lang.Object
clone,equals,finalize,getClass,hashCode,notify,notifyAll,toString,wait,wait,wait

- Field Detail
  - E
```
public static final double E
```
    Thedouble value that is closer than any other toe, the base of the natural logarithms.
    See Also:
    Constant Field Values
  - PI
```
public static final double PI
```
    Thedouble value that is closer than any other topi, the ratio of the circumference of a circle to its diameter.
    See Also:
    Constant Field Values
- Method Detail
  - sin
```
public static double sin(double a)
```
    Returns the trigonometric sine of an angle. Special cases:
    If the argument is NaN or an infinity, then the result is NaN.
    If the argument is zero, then the result is a zero with the same sign as the argument.
    The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.
    Parameters:
    a - an angle, in radians.
    Returns:
    the sine of the argument.
  - cos
```
public static double cos(double a)
```
    Returns the trigonometric cosine of an angle. Special cases:
    If the argument is NaN or an infinity, then the result is NaN.
    The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.
    Parameters:
    a - an angle, in radians.
    Returns:
    the cosine of the argument.
  - tan
```
public static double tan(double a)
```
    Returns the trigonometric tangent of an angle. Special cases:
    If the argument is NaN or an infinity, then the result is NaN.
    If the argument is zero, then the result is a zero with the same sign as the argument.
    The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.
    Parameters:
    a - an angle, in radians.
    Returns:
    the tangent of the argument.
  - asin
```
public static double asin(double a)
```
    Returns the arc sine of a value; the returned angle is in the range -pi/2 throughpi/2. Special cases:
    If the argument is NaN or its absolute value is greater than 1, then the result is NaN.
    If the argument is zero, then the result is a zero with the same sign as the argument.
    The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.
    Parameters:
    a - the value whose arc sine is to be returned.
    Returns:
    the arc sine of the argument.
  - acos
```
public static double acos(double a)
```
    Returns the arc cosine of a value; the returned angle is in the range 0.0 throughpi. Special case:
    If the argument is NaN or its absolute value is greater than 1, then the result is NaN.
    The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.
    Parameters:
    a - the value whose arc cosine is to be returned.
    Returns:
    the arc cosine of the argument.
  - atan
```
public static double atan(double a)
```
    Returns the arc tangent of a value; the returned angle is in the range -pi/2 throughpi/2. Special cases:
    If the argument is NaN, then the result is NaN.
    If the argument is zero, then the result is a zero with the same sign as the argument.
    The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.
    Parameters:
    a - the value whose arc tangent is to be returned.
    Returns:
    the arc tangent of the argument.
  - toRadians
```
public static double toRadians(double angdeg)
```
    Converts an angle measured in degrees to an approximately equivalent angle measured in radians. The conversion from degrees to radians is generally inexact.
    Parameters:
    angdeg - an angle, in degrees
    Returns:
    the measurement of the angleangdeg in radians.
    Since:
    1.2
  - toDegrees
```
public static double toDegrees(double angrad)
```
    Converts an angle measured in radians to an approximately equivalent angle measured in degrees. The conversion from radians to degrees is generally inexact; users shouldnot expectcos(toRadians(90.0)) to exactly equal0.0.
    Parameters:
    angrad - an angle, in radians
    Returns:
    the measurement of the angleangrad in degrees.
    Since:
    1.2
  - exp
```
public static double exp(double a)
```
    Returns Euler's numbere raised to the power of adouble value. Special cases:
    If the argument is NaN, the result is NaN.
    If the argument is positive infinity, then the result is positive infinity.
    If the argument is negative infinity, then the result is positive zero.
    The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.
    Parameters:
    a - the exponent to raisee to.
    Returns:
    the valuee^a, wheree is the base of the natural logarithms.
  - log
```
public static double log(double a)
```
    Returns the natural logarithm (basee) of adouble value. Special cases:
    If the argument is NaN or less than zero, then the result is NaN.
    If the argument is positive infinity, then the result is positive infinity.
    If the argument is positive zero or negative zero, then the result is negative infinity.
    The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.
    Parameters:
    a - a value
    Returns:
    the value ln a, the natural logarithm ofa.
  - log10
```
public static double log10(double a)
```
    Returns the base 10 logarithm of adouble value. Special cases:
    If the argument is NaN or less than zero, then the result is NaN.
    If the argument is positive infinity, then the result is positive infinity.
    If the argument is positive zero or negative zero, then the result is negative infinity.
    If the argument is equal to 10ⁿ for integern, then the result isn.
    The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.
    Parameters:
    a - a value
    Returns:
    the base 10 logarithm ofa.
    Since:
    1.5
  - sqrt
```
public static double sqrt(double a)
```
    Returns the correctly rounded positive square root of adouble value. Special cases:
    If the argument is NaN or less than zero, then the result is NaN.
    If the argument is positive infinity, then the result is positive infinity.
    If the argument is positive zero or negative zero, then the result is the same as the argument.
    Otherwise, the result is thedouble value closest to the true mathematical square root of the argument value.
    Parameters:
    a - a value.
    Returns:
    the positive square root ofa. If the argument is NaN or less than zero, the result is NaN.
  - cbrt
```
public static double cbrt(double a)
```
    Returns the cube root of adouble value. For positive finitex,cbrt(-x) == -cbrt(x); that is, the cube root of a negative value is the negative of the cube root of that value's magnitude. Special cases:
    If the argument is NaN, then the result is NaN.
    If the argument is infinite, then the result is an infinity with the same sign as the argument.
    If the argument is zero, then the result is a zero with the same sign as the argument.
    The computed result must be within 1 ulp of the exact result.
    Parameters:
    a - a value.
    Returns:
    the cube root ofa.
    Since:
    1.5
  - IEEEremainder
```
public static double IEEEremainder(double f1,                                   double f2)
```
    Computes the remainder operation on two arguments as prescribed by the IEEE 754 standard. The remainder value is mathematically equal tof1 - f2 × n, wheren is the mathematical integer closest to the exact mathematical value of the quotientf1/f2, and if two mathematical integers are equally close tof1/f2, thenn is the integer that is even. If the remainder is zero, its sign is the same as the sign of the first argument. Special cases:
    If either argument is NaN, or the first argument is infinite, or the second argument is positive zero or negative zero, then the result is NaN.
    If the first argument is finite and the second argument is infinite, then the result is the same as the first argument.
    Parameters:
    f1 - the dividend.
    f2 - the divisor.
    Returns:
    the remainder whenf1 is divided byf2.
  - ceil
```
public static double ceil(double a)
```
    Returns the smallest (closest to negative infinity)double value that is greater than or equal to the argument and is equal to a mathematical integer. Special cases:
    If the argument value is already equal to a mathematical integer, then the result is the same as the argument.
    If the argument is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument.
    If the argument value is less than zero but greater than -1.0, then the result is negative zero.
    Note that the value ofMath.ceil(x) is exactly the value of-Math.floor(-x).
    Parameters:
    a - a value.
    Returns:
    the smallest (closest to negative infinity) floating-point value that is greater than or equal to the argument and is equal to a mathematical integer.
  - floor
```
public static double floor(double a)
```
    Returns the largest (closest to positive infinity)double value that is less than or equal to the argument and is equal to a mathematical integer. Special cases:
    If the argument value is already equal to a mathematical integer, then the result is the same as the argument.
    If the argument is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument.
    Parameters:
    a - a value.
    Returns:
    the largest (closest to positive infinity) floating-point value that less than or equal to the argument and is equal to a mathematical integer.
  - rint
```
public static double rint(double a)
```
    Returns thedouble value that is closest in value to the argument and is equal to a mathematical integer. If twodouble values that are mathematical integers are equally close, the result is the integer value that is even. Special cases:
    If the argument value is already equal to a mathematical integer, then the result is the same as the argument.
    If the argument is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument.
    Parameters:
    a - adouble value.
    Returns:
    the closest floating-point value toa that is equal to a mathematical integer.
  - atan2
```
public static double atan2(double y,                           double x)
```
    Returns the angletheta from the conversion of rectangular coordinates (x, y) to polar coordinates (r, theta). This method computes the phasetheta by computing an arc tangent ofy/x in the range of -pi topi. Special cases:
    If either argument is NaN, then the result is NaN.
    If the first argument is positive zero and the second argument is positive, or the first argument is positive and finite and the second argument is positive infinity, then the result is positive zero.
    If the first argument is negative zero and the second argument is positive, or the first argument is negative and finite and the second argument is positive infinity, then the result is negative zero.
    If the first argument is positive zero and the second argument is negative, or the first argument is positive and finite and the second argument is negative infinity, then the result is thedouble value closest topi.
    If the first argument is negative zero and the second argument is negative, or the first argument is negative and finite and the second argument is negative infinity, then the result is thedouble value closest to -pi.
    If the first argument is positive and the second argument is positive zero or negative zero, or the first argument is positive infinity and the second argument is finite, then the result is thedouble value closest topi/2.
    If the first argument is negative and the second argument is positive zero or negative zero, or the first argument is negative infinity and the second argument is finite, then the result is thedouble value closest to -pi/2.
    If both arguments are positive infinity, then the result is thedouble value closest topi/4.
    If the first argument is positive infinity and the second argument is negative infinity, then the result is thedouble value closest to 3*pi/4.
    If the first argument is negative infinity and the second argument is positive infinity, then the result is thedouble value closest to -pi/4.
    If both arguments are negative infinity, then the result is thedouble value closest to -3*pi/4.
    The computed result must be within 2 ulps of the exact result. Results must be semi-monotonic.
    Parameters:
    y - the ordinate coordinate
    x - the abscissa coordinate
    Returns:
    thetheta component of the point (r, theta) in polar coordinates that corresponds to the point (x, y) in Cartesian coordinates.
  - pow
```
public static double pow(double a,                         double b)
```
    Returns the value of the first argument raised to the power of the second argument. Special cases:
    If the second argument is positive or negative zero, then the result is 1.0.
    If the second argument is 1.0, then the result is the same as the first argument.
    If the second argument is NaN, then the result is NaN.
    If the first argument is NaN and the second argument is nonzero, then the result is NaN.
    If
    the absolute value of the first argument is greater than 1 and the second argument is positive infinity, or
    the absolute value of the first argument is less than 1 and the second argument is negative infinity,
    then the result is positive infinity.
    If
    the absolute value of the first argument is greater than 1 and the second argument is negative infinity, or
    the absolute value of the first argument is less than 1 and the second argument is positive infinity,
    then the result is positive zero.
    If the absolute value of the first argument equals 1 and the second argument is infinite, then the result is NaN.
    If
    the first argument is positive zero and the second argument is greater than zero, or
    the first argument is positive infinity and the second argument is less than zero,
    then the result is positive zero.
    If
    the first argument is positive zero and the second argument is less than zero, or
    the first argument is positive infinity and the second argument is greater than zero,
    then the result is positive infinity.
    If
    the first argument is negative zero and the second argument is greater than zero but not a finite odd integer, or
    the first argument is negative infinity and the second argument is less than zero but not a finite odd integer,
    then the result is positive zero.
    If
    the first argument is negative zero and the second argument is a positive finite odd integer, or
    the first argument is negative infinity and the second argument is a negative finite odd integer,
    then the result is negative zero.
    If
    the first argument is negative zero and the second argument is less than zero but not a finite odd integer, or
    the first argument is negative infinity and the second argument is greater than zero but not a finite odd integer,
    then the result is positive infinity.
    If
    the first argument is negative zero and the second argument is a negative finite odd integer, or
    the first argument is negative infinity and the second argument is a positive finite odd integer,
    then the result is negative infinity.
    If the first argument is finite and less than zero
    if the second argument is a finite even integer, the result is equal to the result of raising the absolute value of the first argument to the power of the second argument
    if the second argument is a finite odd integer, the result is equal to the negative of the result of raising the absolute value of the first argument to the power of the second argument
    if the second argument is finite and not an integer, then the result is NaN.
    If both arguments are integers, then the result is exactly equal to the mathematical result of raising the first argument to the power of the second argument if that result can in fact be represented exactly as adouble value.
    (In the foregoing descriptions, a floating-point value is considered to be an integer if and only if it is finite and a fixed point of the methodceil or, equivalently, a fixed point of the methodfloor. A value is a fixed point of a one-argument method if and only if the result of applying the method to the value is equal to the value.)
    The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.
    Parameters:
    a - the base.
    b - the exponent.
    Returns:
    the valuea^b.
  - round
```
public static int round(float a)
```
    Returns the closestint to the argument, with ties rounding to positive infinity.
    Special cases:
    If the argument is NaN, the result is 0.
    If the argument is negative infinity or any value less than or equal to the value ofInteger.MIN_VALUE, the result is equal to the value ofInteger.MIN_VALUE.
    If the argument is positive infinity or any value greater than or equal to the value ofInteger.MAX_VALUE, the result is equal to the value ofInteger.MAX_VALUE.
    Parameters:
    a - a floating-point value to be rounded to an integer.
    Returns:
    the value of the argument rounded to the nearestint value.
    See Also:
    Integer.MAX_VALUE,Integer.MIN_VALUE
  - round
```
public static long round(double a)
```
    Returns the closestlong to the argument, with ties rounding to positive infinity.
    Special cases:
    If the argument is NaN, the result is 0.
    If the argument is negative infinity or any value less than or equal to the value ofLong.MIN_VALUE, the result is equal to the value ofLong.MIN_VALUE.
    If the argument is positive infinity or any value greater than or equal to the value ofLong.MAX_VALUE, the result is equal to the value ofLong.MAX_VALUE.
    Parameters:
    a - a floating-point value to be rounded to along.
    Returns:
    the value of the argument rounded to the nearestlong value.
    See Also:
    Long.MAX_VALUE,Long.MIN_VALUE
  - random
```
public static double random()
```
    Returns adouble value with a positive sign, greater than or equal to0.0 and less than1.0. Returned values are chosen pseudorandomly with (approximately) uniform distribution from that range.
    When this method is first called, it creates a single new pseudorandom-number generator, exactly as if by the expression
    new java.util.Random()
    This new pseudorandom-number generator is used thereafter for all calls to this method and is used nowhere else.
    This method is properly synchronized to allow correct use by more than one thread. However, if many threads need to generate pseudorandom numbers at a great rate, it may reduce contention for each thread to have its own pseudorandom-number generator.
    API Note:
    As the largestdouble value less than1.0 isMath.nextDown(1.0), a valuex in the closed range[x1,x2] wherex1<=x2 may be defined by the statements
    double f = Math.random()/Math.nextDown(1.0); double x = x1*(1.0 - f) + x2*f;
    Returns:
    a pseudorandomdouble greater than or equal to0.0 and less than1.0.
    See Also:
    nextDown(double),Random.nextDouble()
  - addExact
```
public static int addExact(int x,                           int y)
```
    Returns the sum of its arguments, throwing an exception if the result overflows anint.
    Parameters:
    x - the first value
    y - the second value
    Returns:
    the result
    Throws:
    ArithmeticException - if the result overflows an int
    Since:
    1.8
  - addExact
```
public static long addExact(long x,                            long y)
```
    Returns the sum of its arguments, throwing an exception if the result overflows along.
    Parameters:
    x - the first value
    y - the second value
    Returns:
    the result
    Throws:
    ArithmeticException - if the result overflows a long
    Since:
    1.8
  - subtractExact
```
public static int subtractExact(int x,                                int y)
```
    Returns the difference of the arguments, throwing an exception if the result overflows anint.
    Parameters:
    x - the first value
    y - the second value to subtract from the first
    Returns:
    the result
    Throws:
    ArithmeticException - if the result overflows an int
    Since:
    1.8
  - subtractExact
```
public static long subtractExact(long x,                                 long y)
```
    Returns the difference of the arguments, throwing an exception if the result overflows along.
    Parameters:
    x - the first value
    y - the second value to subtract from the first
    Returns:
    the result
    Throws:
    ArithmeticException - if the result overflows a long
    Since:
    1.8
  - multiplyExact
```
public static int multiplyExact(int x,                                int y)
```
    Returns the product of the arguments, throwing an exception if the result overflows anint.
    Parameters:
    x - the first value
    y - the second value
    Returns:
    the result
    Throws:
    ArithmeticException - if the result overflows an int
    Since:
    1.8
  - multiplyExact
```
public static long multiplyExact(long x,                                 int y)
```
    Returns the product of the arguments, throwing an exception if the result overflows along.
    Parameters:
    x - the first value
    y - the second value
    Returns:
    the result
    Throws:
    ArithmeticException - if the result overflows a long
    Since:
    9
  - multiplyExact
```
public static long multiplyExact(long x,                                 long y)
```
    Returns the product of the arguments, throwing an exception if the result overflows along.
    Parameters:
    x - the first value
    y - the second value
    Returns:
    the result
    Throws:
    ArithmeticException - if the result overflows a long
    Since:
    1.8
  - incrementExact
```
public static int incrementExact(int a)
```
    Returns the argument incremented by one, throwing an exception if the result overflows anint.
    Parameters:
    a - the value to increment
    Returns:
    the result
    Throws:
    ArithmeticException - if the result overflows an int
    Since:
    1.8
  - incrementExact
```
public static long incrementExact(long a)
```
    Returns the argument incremented by one, throwing an exception if the result overflows along.
    Parameters:
    a - the value to increment
    Returns:
    the result
    Throws:
    ArithmeticException - if the result overflows a long
    Since:
    1.8
  - decrementExact
```
public static int decrementExact(int a)
```
    Returns the argument decremented by one, throwing an exception if the result overflows anint.
    Parameters:
    a - the value to decrement
    Returns:
    the result
    Throws:
    ArithmeticException - if the result overflows an int
    Since:
    1.8
  - decrementExact
```
public static long decrementExact(long a)
```
    Returns the argument decremented by one, throwing an exception if the result overflows along.
    Parameters:
    a - the value to decrement
    Returns:
    the result
    Throws:
    ArithmeticException - if the result overflows a long
    Since:
    1.8
  - negateExact
```
public static int negateExact(int a)
```
    Returns the negation of the argument, throwing an exception if the result overflows anint.
    Parameters:
    a - the value to negate
    Returns:
    the result
    Throws:
    ArithmeticException - if the result overflows an int
    Since:
    1.8
  - negateExact
```
public static long negateExact(long a)
```
    Returns the negation of the argument, throwing an exception if the result overflows along.
    Parameters:
    a - the value to negate
    Returns:
    the result
    Throws:
    ArithmeticException - if the result overflows a long
    Since:
    1.8
  - toIntExact
```
public static int toIntExact(long value)
```
    Returns the value of thelong argument; throwing an exception if the value overflows anint.
    Parameters:
    value - the long value
    Returns:
    the argument as an int
    Throws:
    ArithmeticException - if theargument overflows an int
    Since:
    1.8
  - multiplyFull
```
public static long multiplyFull(int x,                                int y)
```
    Returns the exact mathematical product of the arguments.
    Parameters:
    x - the first value
    y - the second value
    Returns:
    the result
    Since:
    9
  - multiplyHigh
```
public static long multiplyHigh(long x,                                long y)
```
    Returns as along the most significant 64 bits of the 128-bit product of two 64-bit factors.
    Parameters:
    x - the first value
    y - the second value
    Returns:
    the result
    Since:
    9
  - floorDiv
```
public static int floorDiv(int x,                           int y)
```
    Returns the largest (closest to positive infinity)int value that is less than or equal to the algebraic quotient. There is one special case, if the dividend is theInteger.MIN_VALUE and the divisor is-1, then integer overflow occurs and the result is equal toInteger.MIN_VALUE.
    Normal integer division operates under the round to zero rounding mode (truncation). This operation instead acts under the round toward negative infinity (floor) rounding mode. The floor rounding mode gives different results from truncation when the exact result is negative.
    If the signs of the arguments are the same, the results offloorDiv and the/ operator are the same.
    For example,floorDiv(4, 3) == 1 and(4 / 3) == 1.
    If the signs of the arguments are different, the quotient is negative andfloorDiv returns the integer less than or equal to the quotient and the/ operator returns the integer closest to zero.
    For example,floorDiv(-4, 3) == -2, whereas(-4 / 3) == -1.
    Parameters:
    x - the dividend
    y - the divisor
    Returns:
    the largest (closest to positive infinity)int value that is less than or equal to the algebraic quotient.
    Throws:
    ArithmeticException - if the divisory is zero
    Since:
    1.8
    See Also:
    floorMod(int, int),floor(double)
  - floorDiv
```
public static long floorDiv(long x,                            int y)
```
    Returns the largest (closest to positive infinity)long value that is less than or equal to the algebraic quotient. There is one special case, if the dividend is theLong.MIN_VALUE and the divisor is-1, then integer overflow occurs and the result is equal toLong.MIN_VALUE.
    Normal integer division operates under the round to zero rounding mode (truncation). This operation instead acts under the round toward negative infinity (floor) rounding mode. The floor rounding mode gives different results from truncation when the exact result is negative.
    For examples, seefloorDiv(int, int).
    Parameters:
    x - the dividend
    y - the divisor
    Returns:
    the largest (closest to positive infinity)int value that is less than or equal to the algebraic quotient.
    Throws:
    ArithmeticException - if the divisory is zero
    Since:
    9
    See Also:
    floorMod(long, int),floor(double)
  - floorDiv
```
public static long floorDiv(long x,                            long y)
```
    Returns the largest (closest to positive infinity)long value that is less than or equal to the algebraic quotient. There is one special case, if the dividend is theLong.MIN_VALUE and the divisor is-1, then integer overflow occurs and the result is equal toLong.MIN_VALUE.
    Normal integer division operates under the round to zero rounding mode (truncation). This operation instead acts under the round toward negative infinity (floor) rounding mode. The floor rounding mode gives different results from truncation when the exact result is negative.
    For examples, seefloorDiv(int, int).
    Parameters:
    x - the dividend
    y - the divisor
    Returns:
    the largest (closest to positive infinity)long value that is less than or equal to the algebraic quotient.
    Throws:
    ArithmeticException - if the divisory is zero
    Since:
    1.8
    See Also:
    floorMod(long, long),floor(double)
  - floorMod
```
public static int floorMod(int x,                           int y)
```
    Returns the floor modulus of theint arguments.
    The floor modulus isx - (floorDiv(x, y) * y), has the same sign as the divisory, and is in the range of-abs(y) < r < +abs(y).
    The relationship betweenfloorDiv andfloorMod is such that:
    floorDiv(x, y) * y + floorMod(x, y) == x
    The difference in values betweenfloorMod and the% operator is due to the difference betweenfloorDiv that returns the integer less than or equal to the quotient and the/ operator that returns the integer closest to zero.
    Examples:
    If the signs of the arguments are the same, the results offloorMod and the% operator are the same.
    floorMod(4, 3) == 1; and(4 % 3) == 1
    If the signs of the arguments are different, the results differ from the% operator.
    floorMod(+4, -3) == -2; and(+4 % -3) == +1
    floorMod(-4, +3) == +2; and(-4 % +3) == -1
    floorMod(-4, -3) == -1; and(-4 % -3) == -1
    If the signs of arguments are unknown and a positive modulus is needed it can be computed as(floorMod(x, y) + abs(y)) % abs(y).
    Parameters:
    x - the dividend
    y - the divisor
    Returns:
    the floor modulusx - (floorDiv(x, y) * y)
    Throws:
    ArithmeticException - if the divisory is zero
    Since:
    1.8
    See Also:
    floorDiv(int, int)
  - floorMod
```
public static int floorMod(long x,                           int y)
```
    Returns the floor modulus of thelong andint arguments.
    The floor modulus isx - (floorDiv(x, y) * y), has the same sign as the divisory, and is in the range of-abs(y) < r < +abs(y).
    The relationship betweenfloorDiv andfloorMod is such that:
    floorDiv(x, y) * y + floorMod(x, y) == x
    For examples, seefloorMod(int, int).
    Parameters:
    x - the dividend
    y - the divisor
    Returns:
    the floor modulusx - (floorDiv(x, y) * y)
    Throws:
    ArithmeticException - if the divisory is zero
    Since:
    9
    See Also:
    floorDiv(long, int)
  - floorMod
```
public static long floorMod(long x,                            long y)
```
    Returns the floor modulus of thelong arguments.
    The floor modulus isx - (floorDiv(x, y) * y), has the same sign as the divisory, and is in the range of-abs(y) < r < +abs(y).
    The relationship betweenfloorDiv andfloorMod is such that:
    floorDiv(x, y) * y + floorMod(x, y) == x
    For examples, seefloorMod(int, int).
    Parameters:
    x - the dividend
    y - the divisor
    Returns:
    the floor modulusx - (floorDiv(x, y) * y)
    Throws:
    ArithmeticException - if the divisory is zero
    Since:
    1.8
    See Also:
    floorDiv(long, long)
  - abs
```
public static int abs(int a)
```
    Returns the absolute value of anint value. If the argument is not negative, the argument is returned. If the argument is negative, the negation of the argument is returned.
    Note that if the argument is equal to the value ofInteger.MIN_VALUE, the most negative representableint value, the result is that same value, which is negative.
    Parameters:
    a - the argument whose absolute value is to be determined
    Returns:
    the absolute value of the argument.
  - abs
```
public static long abs(long a)
```
    Returns the absolute value of along value. If the argument is not negative, the argument is returned. If the argument is negative, the negation of the argument is returned.
    Note that if the argument is equal to the value ofLong.MIN_VALUE, the most negative representablelong value, the result is that same value, which is negative.
    Parameters:
    a - the argument whose absolute value is to be determined
    Returns:
    the absolute value of the argument.
  - abs
```
public static float abs(float a)
```
    Returns the absolute value of afloat value. If the argument is not negative, the argument is returned. If the argument is negative, the negation of the argument is returned. Special cases:
    If the argument is positive zero or negative zero, the result is positive zero.
    If the argument is infinite, the result is positive infinity.
    If the argument is NaN, the result is NaN.
    API Note:
    As implied by the above, one valid implementation of this method is given by the expression below which computes afloat with the same exponent and significand as the argument but with a guaranteed zero sign bit indicating a positive value:
    Float.intBitsToFloat(0x7fffffff & Float.floatToRawIntBits(a))
    Parameters:
    a - the argument whose absolute value is to be determined
    Returns:
    the absolute value of the argument.
  - abs
```
public static double abs(double a)
```
    Returns the absolute value of adouble value. If the argument is not negative, the argument is returned. If the argument is negative, the negation of the argument is returned. Special cases:
    If the argument is positive zero or negative zero, the result is positive zero.
    If the argument is infinite, the result is positive infinity.
    If the argument is NaN, the result is NaN.
    API Note:
    As implied by the above, one valid implementation of this method is given by the expression below which computes adouble with the same exponent and significand as the argument but with a guaranteed zero sign bit indicating a positive value:
    Double.longBitsToDouble((Double.doubleToRawLongBits(a)<<1)>>>1)
    Parameters:
    a - the argument whose absolute value is to be determined
    Returns:
    the absolute value of the argument.
  - max
```
public static int max(int a,                      int b)
```
    Returns the greater of twoint values. That is, the result is the argument closer to the value ofInteger.MAX_VALUE. If the arguments have the same value, the result is that same value.
    Parameters:
    a - an argument.
    b - another argument.
    Returns:
    the larger ofa andb.
  - max
```
public static long max(long a,                       long b)
```
    Returns the greater of twolong values. That is, the result is the argument closer to the value ofLong.MAX_VALUE. If the arguments have the same value, the result is that same value.
    Parameters:
    a - an argument.
    b - another argument.
    Returns:
    the larger ofa andb.
  - max
```
public static float max(float a,                        float b)
```
    Returns the greater of twofloat values. That is, the result is the argument closer to positive infinity. If the arguments have the same value, the result is that same value. If either value is NaN, then the result is NaN. Unlike the numerical comparison operators, this method considers negative zero to be strictly smaller than positive zero. If one argument is positive zero and the other negative zero, the result is positive zero.
    Parameters:
    a - an argument.
    b - another argument.
    Returns:
    the larger ofa andb.
  - max
```
public static double max(double a,                         double b)
```
    Returns the greater of twodouble values. That is, the result is the argument closer to positive infinity. If the arguments have the same value, the result is that same value. If either value is NaN, then the result is NaN. Unlike the numerical comparison operators, this method considers negative zero to be strictly smaller than positive zero. If one argument is positive zero and the other negative zero, the result is positive zero.
    Parameters:
    a - an argument.
    b - another argument.
    Returns:
    the larger ofa andb.
  - min
```
public static int min(int a,                      int b)
```
    Returns the smaller of twoint values. That is, the result the argument closer to the value ofInteger.MIN_VALUE. If the arguments have the same value, the result is that same value.
    Parameters:
    a - an argument.
    b - another argument.
    Returns:
    the smaller ofa andb.
  - min
```
public static long min(long a,                       long b)
```
    Returns the smaller of twolong values. That is, the result is the argument closer to the value ofLong.MIN_VALUE. If the arguments have the same value, the result is that same value.
    Parameters:
    a - an argument.
    b - another argument.
    Returns:
    the smaller ofa andb.
  - min
```
public static float min(float a,                        float b)
```
    Returns the smaller of twofloat values. That is, the result is the value closer to negative infinity. If the arguments have the same value, the result is that same value. If either value is NaN, then the result is NaN. Unlike the numerical comparison operators, this method considers negative zero to be strictly smaller than positive zero. If one argument is positive zero and the other is negative zero, the result is negative zero.
    Parameters:
    a - an argument.
    b - another argument.
    Returns:
    the smaller ofa andb.
  - min
```
public static double min(double a,                         double b)
```
    Returns the smaller of twodouble values. That is, the result is the value closer to negative infinity. If the arguments have the same value, the result is that same value. If either value is NaN, then the result is NaN. Unlike the numerical comparison operators, this method considers negative zero to be strictly smaller than positive zero. If one argument is positive zero and the other is negative zero, the result is negative zero.
    Parameters:
    a - an argument.
    b - another argument.
    Returns:
    the smaller ofa andb.
  - fma
```
public static double fma(double a,                         double b,                         double c)
```
    Returns the fused multiply add of the three arguments; that is, returns the exact product of the first two arguments summed with the third argument and then rounded once to the nearestdouble. The rounding is done using theround to nearest even rounding mode. In contrast, ifa * b + c is evaluated as a regular floating-point expression, two rounding errors are involved, the first for the multiply operation, the second for the addition operation.
    Special cases:
    If any argument is NaN, the result is NaN.
    If one of the first two arguments is infinite and the other is zero, the result is NaN.
    If the exact product of the first two arguments is infinite (in other words, at least one of the arguments is infinite and the other is neither zero nor NaN) and the third argument is an infinity of the opposite sign, the result is NaN.
    Note thatfma(a, 1.0, c) returns the same result as (a + c). However,fma(a, b, +0.0) doesnot always return the same result as (a * b) sincefma(-0.0, +0.0, +0.0) is+0.0 while (-0.0 * +0.0) is-0.0;fma(a, b, -0.0) is equivalent to (a * b) however.
    API Note:
    This method corresponds to the fusedMultiplyAdd operation defined in IEEE 754-2008.
    Parameters:
    a - a value
    b - a value
    c - a value
    Returns:
    (a × b + c) computed, as if with unlimited range and precision, and rounded once to the nearestdouble value
    Since:
    9
  - fma
```
public static float fma(float a,                        float b,                        float c)
```
    Returns the fused multiply add of the three arguments; that is, returns the exact product of the first two arguments summed with the third argument and then rounded once to the nearestfloat. The rounding is done using theround to nearest even rounding mode. In contrast, ifa * b + c is evaluated as a regular floating-point expression, two rounding errors are involved, the first for the multiply operation, the second for the addition operation.
    Special cases:
    If any argument is NaN, the result is NaN.
    If one of the first two arguments is infinite and the other is zero, the result is NaN.
    If the exact product of the first two arguments is infinite (in other words, at least one of the arguments is infinite and the other is neither zero nor NaN) and the third argument is an infinity of the opposite sign, the result is NaN.
    Note thatfma(a, 1.0f, c) returns the same result as (a + c). However,fma(a, b, +0.0f) doesnot always return the same result as (a * b) sincefma(-0.0f, +0.0f, +0.0f) is+0.0f while (-0.0f * +0.0f) is-0.0f;fma(a, b, -0.0f) is equivalent to (a * b) however.
    API Note:
    This method corresponds to the fusedMultiplyAdd operation defined in IEEE 754-2008.
    Parameters:
    a - a value
    b - a value
    c - a value
    Returns:
    (a × b + c) computed, as if with unlimited range and precision, and rounded once to the nearestfloat value
    Since:
    9
  - ulp
```
public static double ulp(double d)
```
    Returns the size of an ulp of the argument. An ulp, unit in the last place, of adouble value is the positive distance between this floating-point value and the double value next larger in magnitude. Note that for non-NaNx,ulp(-x) == ulp(x).
    Special Cases:
    If the argument is NaN, then the result is NaN.
    If the argument is positive or negative infinity, then the result is positive infinity.
    If the argument is positive or negative zero, then the result isDouble.MIN_VALUE.
    If the argument is ±Double.MAX_VALUE, then the result is equal to 2⁹⁷¹.
    Parameters:
    d - the floating-point value whose ulp is to be returned
    Returns:
    the size of an ulp of the argument
    Since:
    1.5
  - ulp
```
public static float ulp(float f)
```
    Returns the size of an ulp of the argument. An ulp, unit in the last place, of afloat value is the positive distance between this floating-point value and the float value next larger in magnitude. Note that for non-NaNx,ulp(-x) == ulp(x).
    Special Cases:
    If the argument is NaN, then the result is NaN.
    If the argument is positive or negative infinity, then the result is positive infinity.
    If the argument is positive or negative zero, then the result isFloat.MIN_VALUE.
    If the argument is ±Float.MAX_VALUE, then the result is equal to 2¹⁰⁴.
    Parameters:
    f - the floating-point value whose ulp is to be returned
    Returns:
    the size of an ulp of the argument
    Since:
    1.5
  - signum
```
public static double signum(double d)
```
    Returns the signum function of the argument; zero if the argument is zero, 1.0 if the argument is greater than zero, -1.0 if the argument is less than zero.
    Special Cases:
    If the argument is NaN, then the result is NaN.
    If the argument is positive zero or negative zero, then the result is the same as the argument.
    Parameters:
    d - the floating-point value whose signum is to be returned
    Returns:
    the signum function of the argument
    Since:
    1.5
  - signum
```
public static float signum(float f)
```
    Returns the signum function of the argument; zero if the argument is zero, 1.0f if the argument is greater than zero, -1.0f if the argument is less than zero.
    Special Cases:
    If the argument is NaN, then the result is NaN.
    If the argument is positive zero or negative zero, then the result is the same as the argument.
    Parameters:
    f - the floating-point value whose signum is to be returned
    Returns:
    the signum function of the argument
    Since:
    1.5
  - sinh
```
public static double sinh(double x)
```
    Returns the hyperbolic sine of adouble value. The hyperbolic sine ofx is defined to be (e^x - e^-x)/2 wheree isEuler's number.
    Special cases:
    If the argument is NaN, then the result is NaN.
    If the argument is infinite, then the result is an infinity with the same sign as the argument.
    If the argument is zero, then the result is a zero with the same sign as the argument.
    The computed result must be within 2.5 ulps of the exact result.
    Parameters:
    x - The number whose hyperbolic sine is to be returned.
    Returns:
    The hyperbolic sine ofx.
    Since:
    1.5
  - cosh
```
public static double cosh(double x)
```
    Returns the hyperbolic cosine of adouble value. The hyperbolic cosine ofx is defined to be (e^x + e^-x)/2 wheree isEuler's number.
    Special cases:
    If the argument is NaN, then the result is NaN.
    If the argument is infinite, then the result is positive infinity.
    If the argument is zero, then the result is1.0.
    The computed result must be within 2.5 ulps of the exact result.
    Parameters:
    x - The number whose hyperbolic cosine is to be returned.
    Returns:
    The hyperbolic cosine ofx.
    Since:
    1.5
  - tanh
```
public static double tanh(double x)
```
    Returns the hyperbolic tangent of adouble value. The hyperbolic tangent ofx is defined to be (e^x - e^-x)/(e^x + e^-x), in other words,sinh(x)/cosh(x). Note that the absolute value of the exact tanh is always less than 1.
    Special cases:
    If the argument is NaN, then the result is NaN.
    If the argument is zero, then the result is a zero with the same sign as the argument.
    If the argument is positive infinity, then the result is+1.0.
    If the argument is negative infinity, then the result is-1.0.
    The computed result must be within 2.5 ulps of the exact result. The result oftanh for any finite input must have an absolute value less than or equal to 1. Note that once the exact result of tanh is within 1/2 of an ulp of the limit value of ±1, correctly signed ±1.0 should be returned.
    Parameters:
    x - The number whose hyperbolic tangent is to be returned.
    Returns:
    The hyperbolic tangent ofx.
    Since:
    1.5
  - hypot
```
public static double hypot(double x,                           double y)
```
    Returns sqrt(x² +y²) without intermediate overflow or underflow.
    Special cases:
    If either argument is infinite, then the result is positive infinity.
    If either argument is NaN and neither argument is infinite, then the result is NaN.
    The computed result must be within 1 ulp of the exact result. If one parameter is held constant, the results must be semi-monotonic in the other parameter.
    Parameters:
    x - a value
    y - a value
    Returns:
    sqrt(x² +y²) without intermediate overflow or underflow
    Since:
    1.5
  - expm1
```
public static double expm1(double x)
```
    Returnse^x -1. Note that for values ofx near 0, the exact sum ofexpm1(x) + 1 is much closer to the true result ofe^x thanexp(x).
    Special cases:
    If the argument is NaN, the result is NaN.
    If the argument is positive infinity, then the result is positive infinity.
    If the argument is negative infinity, then the result is -1.0.
    If the argument is zero, then the result is a zero with the same sign as the argument.
    The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic. The result ofexpm1 for any finite input must be greater than or equal to-1.0. Note that once the exact result ofe^x - 1 is within 1/2 ulp of the limit value -1,-1.0 should be returned.
    Parameters:
    x - the exponent to raisee to in the computation ofe^x -1.
    Returns:
    the valuee^x - 1.
    Since:
    1.5
  - log1p
```
public static double log1p(double x)
```
    Returns the natural logarithm of the sum of the argument and 1. Note that for small valuesx, the result oflog1p(x) is much closer to the true result of ln(1 +x) than the floating-point evaluation oflog(1.0+x).
    Special cases:
    If the argument is NaN or less than -1, then the result is NaN.
    If the argument is positive infinity, then the result is positive infinity.
    If the argument is negative one, then the result is negative infinity.
    If the argument is zero, then the result is a zero with the same sign as the argument.
    The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.
    Parameters:
    x - a value
    Returns:
    the value ln(x + 1), the natural log ofx + 1
    Since:
    1.5
  - copySign
```
public static double copySign(double magnitude,                              double sign)
```
    Returns the first floating-point argument with the sign of the second floating-point argument. Note that unlike theStrictMath.copySign method, this method does not require NaNsign arguments to be treated as positive values; implementations are permitted to treat some NaN arguments as positive and other NaN arguments as negative to allow greater performance.
    Parameters:
    magnitude - the parameter providing the magnitude of the result
    sign - the parameter providing the sign of the result
    Returns:
    a value with the magnitude ofmagnitude and the sign ofsign.
    Since:
    1.6
  - copySign
```
public static float copySign(float magnitude,                             float sign)
```
    Returns the first floating-point argument with the sign of the second floating-point argument. Note that unlike theStrictMath.copySign method, this method does not require NaNsign arguments to be treated as positive values; implementations are permitted to treat some NaN arguments as positive and other NaN arguments as negative to allow greater performance.
    Parameters:
    magnitude - the parameter providing the magnitude of the result
    sign - the parameter providing the sign of the result
    Returns:
    a value with the magnitude ofmagnitude and the sign ofsign.
    Since:
    1.6
  - getExponent
```
public static int getExponent(float f)
```
    Returns the unbiased exponent used in the representation of afloat. Special cases:
    If the argument is NaN or infinite, then the result isFloat.MAX_EXPONENT + 1.
    If the argument is zero or subnormal, then the result isFloat.MIN_EXPONENT -1.
    Parameters:
    f - afloat value
    Returns:
    the unbiased exponent of the argument
    Since:
    1.6
  - getExponent
```
public static int getExponent(double d)
```
    Returns the unbiased exponent used in the representation of adouble. Special cases:
    If the argument is NaN or infinite, then the result isDouble.MAX_EXPONENT + 1.
    If the argument is zero or subnormal, then the result isDouble.MIN_EXPONENT -1.
    Parameters:
    d - adouble value
    Returns:
    the unbiased exponent of the argument
    Since:
    1.6
  - nextAfter
```
public static double nextAfter(double start,                               double direction)
```
    Returns the floating-point number adjacent to the first argument in the direction of the second argument. If both arguments compare as equal the second argument is returned.
    Special cases:
    If either argument is a NaN, then NaN is returned.
    If both arguments are signed zeros,direction is returned unchanged (as implied by the requirement of returning the second argument if the arguments compare as equal).
    Ifstart is ±Double.MIN_VALUE anddirection has a value such that the result should have a smaller magnitude, then a zero with the same sign asstart is returned.
    Ifstart is infinite anddirection has a value such that the result should have a smaller magnitude,Double.MAX_VALUE with the same sign asstart is returned.
    Ifstart is equal to ±Double.MAX_VALUE anddirection has a value such that the result should have a larger magnitude, an infinity with same sign asstart is returned.
    Parameters:
    start - starting floating-point value
    direction - value indicating which ofstart's neighbors orstart should be returned
    Returns:
    The floating-point number adjacent tostart in the direction ofdirection.
    Since:
    1.6
  - nextAfter
```
public static float nextAfter(float start,                              double direction)
```
    Returns the floating-point number adjacent to the first argument in the direction of the second argument. If both arguments compare as equal a value equivalent to the second argument is returned.
    Special cases:
    If either argument is a NaN, then NaN is returned.
    If both arguments are signed zeros, a value equivalent todirection is returned.
    Ifstart is ±Float.MIN_VALUE anddirection has a value such that the result should have a smaller magnitude, then a zero with the same sign asstart is returned.
    Ifstart is infinite anddirection has a value such that the result should have a smaller magnitude,Float.MAX_VALUE with the same sign asstart is returned.
    Ifstart is equal to ±Float.MAX_VALUE anddirection has a value such that the result should have a larger magnitude, an infinity with same sign asstart is returned.
    Parameters:
    start - starting floating-point value
    direction - value indicating which ofstart's neighbors orstart should be returned
    Returns:
    The floating-point number adjacent tostart in the direction ofdirection.
    Since:
    1.6
  - nextUp
```
public static double nextUp(double d)
```
    Returns the floating-point value adjacent tod in the direction of positive infinity. This method is semantically equivalent tonextAfter(d, Double.POSITIVE_INFINITY); however, anextUp implementation may run faster than its equivalentnextAfter call.
    Special Cases:
    If the argument is NaN, the result is NaN.
    If the argument is positive infinity, the result is positive infinity.
    If the argument is zero, the result isDouble.MIN_VALUE
    Parameters:
    d - starting floating-point value
    Returns:
    The adjacent floating-point value closer to positive infinity.
    Since:
    1.6
  - nextUp
```
public static float nextUp(float f)
```
    Returns the floating-point value adjacent tof in the direction of positive infinity. This method is semantically equivalent tonextAfter(f, Float.POSITIVE_INFINITY); however, anextUp implementation may run faster than its equivalentnextAfter call.
    Special Cases:
    If the argument is NaN, the result is NaN.
    If the argument is positive infinity, the result is positive infinity.
    If the argument is zero, the result isFloat.MIN_VALUE
    Parameters:
    f - starting floating-point value
    Returns:
    The adjacent floating-point value closer to positive infinity.
    Since:
    1.6
  - nextDown
```
public static double nextDown(double d)
```
    Returns the floating-point value adjacent tod in the direction of negative infinity. This method is semantically equivalent tonextAfter(d, Double.NEGATIVE_INFINITY); however, anextDown implementation may run faster than its equivalentnextAfter call.
    Special Cases:
    If the argument is NaN, the result is NaN.
    If the argument is negative infinity, the result is negative infinity.
    If the argument is zero, the result is-Double.MIN_VALUE
    Parameters:
    d - starting floating-point value
    Returns:
    The adjacent floating-point value closer to negative infinity.
    Since:
    1.8
  - nextDown
```
public static float nextDown(float f)
```
    Returns the floating-point value adjacent tof in the direction of negative infinity. This method is semantically equivalent tonextAfter(f, Float.NEGATIVE_INFINITY); however, anextDown implementation may run faster than its equivalentnextAfter call.
    Special Cases:
    If the argument is NaN, the result is NaN.
    If the argument is negative infinity, the result is negative infinity.
    If the argument is zero, the result is-Float.MIN_VALUE
    Parameters:
    f - starting floating-point value
    Returns:
    The adjacent floating-point value closer to negative infinity.
    Since:
    1.8
  - scalb
```
public static double scalb(double d,                           int scaleFactor)
```
    Returnsd × 2^scaleFactor rounded as if performed by a single correctly rounded floating-point multiply to a member of the double value set. See the Java Language Specification for a discussion of floating-point value sets. If the exponent of the result is betweenDouble.MIN_EXPONENT andDouble.MAX_EXPONENT, the answer is calculated exactly. If the exponent of the result would be larger thanDouble.MAX_EXPONENT, an infinity is returned. Note that if the result is subnormal, precision may be lost; that is, whenscalb(x, n) is subnormal,scalb(scalb(x, n), -n) may not equalx. When the result is non-NaN, the result has the same sign asd.
    Special cases:
    If the first argument is NaN, NaN is returned.
    If the first argument is infinite, then an infinity of the same sign is returned.
    If the first argument is zero, then a zero of the same sign is returned.
    Parameters:
    d - number to be scaled by a power of two.
    scaleFactor - power of 2 used to scaled
    Returns:
    d × 2^scaleFactor
    Since:
    1.6
  - scalb
```
public static float scalb(float f,                          int scaleFactor)
```
    Returnsf × 2^scaleFactor rounded as if performed by a single correctly rounded floating-point multiply to a member of the float value set. See the Java Language Specification for a discussion of floating-point value sets. If the exponent of the result is betweenFloat.MIN_EXPONENT andFloat.MAX_EXPONENT, the answer is calculated exactly. If the exponent of the result would be larger thanFloat.MAX_EXPONENT, an infinity is returned. Note that if the result is subnormal, precision may be lost; that is, whenscalb(x, n) is subnormal,scalb(scalb(x, n), -n) may not equalx. When the result is non-NaN, the result has the same sign asf.
    Special cases:
    If the first argument is NaN, NaN is returned.
    If the first argument is infinite, then an infinity of the same sign is returned.
    If the first argument is zero, then a zero of the same sign is returned.
    Parameters:
    f - number to be scaled by a power of two.
    scaleFactor - power of 2 used to scalef
    Returns:
    f × 2^scaleFactor
    Since:
    1.6

Movatterモバイル変換

Class Math

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

E

PI

Method Detail

sin

cos

tan

asin

acos

atan

toRadians

toDegrees

exp

log

log10

sqrt

cbrt

IEEEremainder

ceil

floor

rint

atan2

pow

round

round

random

addExact

addExact

subtractExact

subtractExact

multiplyExact

multiplyExact

multiplyExact

incrementExact

incrementExact

decrementExact

decrementExact

negateExact

negateExact

toIntExact

multiplyFull

multiplyHigh

floorDiv

floorDiv

floorDiv

floorMod

floorMod

floorMod

abs

abs

abs

abs

max

max

max

max

min

min

min

min

fma

fma

ulp

ulp

signum

signum

sinh

cosh

tanh

hypot

expm1

log1p

copySign

copySign

getExponent