Math (Java SE 10 & JDK 10 ) (original) (raw)
Field Summary
Fields
Modifier and Type Field Description static double E The double value that is closer than any other to_e_, the base of the natural logarithms. static double PI The double value that is closer than any other to_pi_, 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 through pi. 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 through pi/2. static double atan(double a) Returns the arc tangent of a value; the returned angle is in the range -pi/2 through pi/2. static double atan2(double y, double x) Returns the angle theta 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 number e raised to the power of adouble value. static double expm1(double x) Returns _e_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 nearestdouble. 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. static int getExponent(double d) Returns the unbiased exponent used in the representation of adouble. static int getExponent(float f) Returns the unbiased exponent used in the representation of afloat. static double hypot(double x, double y) Returns sqrt(_x_2 +_y_2) 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 (base e) 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 × 2scaleFactor 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 × 2scaleFactor 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 adouble 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 declared in class java.lang.[Object](../../java/lang/Object.html "class in java.lang") `[clone](../../java/lang/Object.html#clone%28%29), [equals](../../java/lang/Object.html#equals%28java.lang.Object%29), [finalize](../../java/lang/Object.html#finalize%28%29), [getClass](../../java/lang/Object.html#getClass%28%29), [hashCode](../../java/lang/Object.html#hashCode%28%29), [notify](../../java/lang/Object.html#notify%28%29), [notifyAll](../../java/lang/Object.html#notifyAll%28%29), [toString](../../java/lang/Object.html#toString%28%29), [wait](../../java/lang/Object.html#wait%28%29), [wait](../../java/lang/Object.html#wait%28long%29), [wait](../../java/lang/Object.html#wait%28long,int%29)`Field Detail
* #### E public static final double E The `double` value that is closer than any other to_e_, the base of the natural logarithms. See Also: [Constant Field Values](../../constant-values.html#java.lang.Math.E) * #### PI public static final double PI The `double` value that is closer than any other to_pi_, the ratio of the circumference of a circle to its diameter. See Also: [Constant Field Values](../../constant-values.html#java.lang.Math.PI)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 through _pi_/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 through _pi_. 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 through _pi_/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 angle `angdeg` 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 should_not_ expect `cos(toRadians(90.0))` to exactly equal `0.0`. Parameters: `angrad` \- an angle, in radians Returns: the measurement of the angle `angrad` in degrees. Since: 1.2 * #### exp public static double exp(double a) Returns Euler's number _e_ raised to the power of a`double` 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 raise _e_ to. Returns: the value _e_`a`, where _e_ is the base of the natural logarithms. * #### log public static double log(double a) Returns the natural logarithm (base _e_) of a `double` 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 of`a`. * #### log10 public static double log10(double a) Returns the base 10 logarithm of a `double` 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 10_n_ for integer _n_, then the result is _n_. 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 of `a`. Since: 1.5 * #### sqrt public static double sqrt(double a) Returns the correctly rounded positive square root of a`double` 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 the `double` value closest to the true mathematical square root of the argument value. Parameters: `a` \- a value. Returns: the positive square root of `a`. 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 a `double` value. For positive finite `x`, `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 of `a`. 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 to`f1 - f2` × _n_, where _n_ is the mathematical integer closest to the exact mathematical value of the quotient `f1/f2`, and if two mathematical integers are equally close to `f1/f2`, then _n_ 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 when `f1` is divided by`f2`. * #### 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 of `Math.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 the `double` value that is closest in value to the argument and is equal to a mathematical integer. If two`double` 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` \- a `double` value. Returns: the closest floating-point value to `a` that is equal to a mathematical integer. * #### atan2 public static double atan2(double y, double x) Returns the angle _theta_ from the conversion of rectangular coordinates (`x`, `y`) to polar coordinates (r, _theta_). This method computes the phase _theta_ by computing an arc tangent of `y/x` in the range of -_pi_ to _pi_. 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 the`double` value closest to _pi_. * 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 the`double` 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 the`double` value closest to _pi_/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 the`double` value closest to -_pi_/2. * If both arguments are positive infinity, then the result is the`double` value closest to _pi_/4. * If the first argument is positive infinity and the second argument is negative infinity, then the result is the `double` value closest to 3\*_pi_/4. * If the first argument is negative infinity and the second argument is positive infinity, then the result is the `double` value closest to -_pi_/4. * If both arguments are negative infinity, then the result is the`double` 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: the _theta_ 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 a `double` 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 method [ceil](../../java/lang/Math.html#ceil%28double%29) or, equivalently, a fixed point of the method [floor](../../java/lang/Math.html#floor%28double%29). 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 value `a` `b`. * #### round public static int round(float a) Returns the closest `int` 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 of `Integer.MIN_VALUE`, the result is equal to the value of `Integer.MIN_VALUE`. * If the argument is positive infinity or any value greater than or equal to the value of `Integer.MAX_VALUE`, the result is equal to the value of `Integer.MAX_VALUE`. Parameters: `a` \- a floating-point value to be rounded to an integer. Returns: the value of the argument rounded to the nearest`int` value. See Also: [Integer.MAX\_VALUE](../../java/lang/Integer.html#MAX%5FVALUE), [Integer.MIN\_VALUE](../../java/lang/Integer.html#MIN%5FVALUE) * #### round public static long round(double a) Returns the closest `long` 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 of `Long.MIN_VALUE`, the result is equal to the value of `Long.MIN_VALUE`. * If the argument is positive infinity or any value greater than or equal to the value of `Long.MAX_VALUE`, the result is equal to the value of `Long.MAX_VALUE`. Parameters: `a` \- a floating-point value to be rounded to a`long`. Returns: the value of the argument rounded to the nearest`long` value. See Also: [Long.MAX\_VALUE](../../java/lang/Long.html#MAX%5FVALUE), [Long.MIN\_VALUE](../../java/lang/Long.html#MIN%5FVALUE) * #### random public static double random() Returns a `double` value with a positive sign, greater than or equal to `0.0` and less than `1.0`. 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 largest `double` value less than `1.0` is `Math.nextDown(1.0)`, a value `x` in the closed range`[x1,x2]` where `x1<=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 pseudorandom `double` greater than or equal to `0.0` and less than `1.0`. See Also: [nextDown(double)](../../java/lang/Math.html#nextDown%28double%29), [Random.nextDouble()](../../java/util/Random.html#nextDouble%28%29) * #### addExact public static int addExact(int x, int y) Returns the sum of its arguments, throwing an exception if the result overflows an `int`. Parameters: `x` \- the first value `y` \- the second value Returns: the result Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- 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 a `long`. Parameters: `x` \- the first value `y` \- the second value Returns: the result Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- 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 an `int`. Parameters: `x` \- the first value `y` \- the second value to subtract from the first Returns: the result Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- 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 a `long`. Parameters: `x` \- the first value `y` \- the second value to subtract from the first Returns: the result Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- 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 an `int`. Parameters: `x` \- the first value `y` \- the second value Returns: the result Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- 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 a `long`. Parameters: `x` \- the first value `y` \- the second value Returns: the result Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- 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 a `long`. Parameters: `x` \- the first value `y` \- the second value Returns: the result Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- 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 an `int`. Parameters: `a` \- the value to increment Returns: the result Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- 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 a `long`. Parameters: `a` \- the value to increment Returns: the result Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- 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 an `int`. Parameters: `a` \- the value to decrement Returns: the result Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- 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 a `long`. Parameters: `a` \- the value to decrement Returns: the result Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- 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 an `int`. Parameters: `a` \- the value to negate Returns: the result Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- 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 a `long`. Parameters: `a` \- the value to negate Returns: the result Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- if the result overflows a long Since: 1.8 * #### toIntExact public static int toIntExact(long value) Returns the value of the `long` argument; throwing an exception if the value overflows an `int`. Parameters: `value` \- the long value Returns: the argument as an int Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- if the `argument` 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 a `long` 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 the[Integer.MIN\_VALUE](../../java/lang/Integer.html#MIN%5FVALUE) and the divisor is `-1`, then integer overflow occurs and the result is equal to `Integer.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 of`floorDiv` 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 and`floorDiv` 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](../../java/lang/ArithmeticException.html "class in java.lang")` \- if the divisor `y` is zero Since: 1.8 See Also: [floorMod(int, int)](../../java/lang/Math.html#floorMod%28int,int%29), [floor(double)](../../java/lang/Math.html#floor%28double%29) * #### 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 the[Long.MIN\_VALUE](../../java/lang/Long.html#MIN%5FVALUE) and the divisor is `-1`, then integer overflow occurs and the result is equal to `Long.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, see [floorDiv(int, int)](../../java/lang/Math.html#floorDiv%28int,int%29). 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](../../java/lang/ArithmeticException.html "class in java.lang")` \- if the divisor `y` is zero Since: 9 See Also: [floorMod(long, int)](../../java/lang/Math.html#floorMod%28long,int%29), [floor(double)](../../java/lang/Math.html#floor%28double%29) * #### 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 the[Long.MIN\_VALUE](../../java/lang/Long.html#MIN%5FVALUE) and the divisor is `-1`, then integer overflow occurs and the result is equal to `Long.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, see [floorDiv(int, int)](../../java/lang/Math.html#floorDiv%28int,int%29). 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](../../java/lang/ArithmeticException.html "class in java.lang")` \- if the divisor `y` is zero Since: 1.8 See Also: [floorMod(long, long)](../../java/lang/Math.html#floorMod%28long,long%29), [floor(double)](../../java/lang/Math.html#floor%28double%29) * #### floorMod public static int floorMod(int x, int y) Returns the floor modulus of the `int` arguments. The floor modulus is `x - (floorDiv(x, y) * y)`, has the same sign as the divisor `y`, and is in the range of `-abs(y) < r < +abs(y)`. The relationship between `floorDiv` and `floorMod` is such that: * `floorDiv(x, y) * y + floorMod(x, y) == x` The difference in values between `floorMod` and the `%` operator is due to the difference between`floorDiv` 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 of `floorMod` 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 modulus `x - (floorDiv(x, y) * y)` Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- if the divisor `y` is zero Since: 1.8 See Also: [floorDiv(int, int)](../../java/lang/Math.html#floorDiv%28int,int%29) * #### floorMod public static int floorMod(long x, int y) Returns the floor modulus of the `long` and `int` arguments. The floor modulus is `x - (floorDiv(x, y) * y)`, has the same sign as the divisor `y`, and is in the range of `-abs(y) < r < +abs(y)`. The relationship between `floorDiv` and `floorMod` is such that: * `floorDiv(x, y) * y + floorMod(x, y) == x` For examples, see [floorMod(int, int)](../../java/lang/Math.html#floorMod%28int,int%29). Parameters: `x` \- the dividend `y` \- the divisor Returns: the floor modulus `x - (floorDiv(x, y) * y)` Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- if the divisor `y` is zero Since: 9 See Also: [floorDiv(long, int)](../../java/lang/Math.html#floorDiv%28long,int%29) * #### floorMod public static long floorMod(long x, long y) Returns the floor modulus of the `long` arguments. The floor modulus is `x - (floorDiv(x, y) * y)`, has the same sign as the divisor `y`, and is in the range of `-abs(y) < r < +abs(y)`. The relationship between `floorDiv` and `floorMod` is such that: * `floorDiv(x, y) * y + floorMod(x, y) == x` For examples, see [floorMod(int, int)](../../java/lang/Math.html#floorMod%28int,int%29). Parameters: `x` \- the dividend `y` \- the divisor Returns: the floor modulus `x - (floorDiv(x, y) * y)` Throws: `[ArithmeticException](../../java/lang/ArithmeticException.html "class in java.lang")` \- if the divisor `y` is zero Since: 1.8 See Also: [floorDiv(long, long)](../../java/lang/Math.html#floorDiv%28long,long%29) * #### abs public static int abs(int a) Returns the absolute value of an `int` 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 of[Integer.MIN\_VALUE](../../java/lang/Integer.html#MIN%5FVALUE), the most negative representable`int` 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 a `long` 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 of[Long.MIN\_VALUE](../../java/lang/Long.html#MIN%5FVALUE), the most negative representable`long` 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 a `float` 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 a`float` 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 a `double` 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 a`double` 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 two `int` values. That is, the result is the argument closer to the value of[Integer.MAX\_VALUE](../../java/lang/Integer.html#MAX%5FVALUE). If the arguments have the same value, the result is that same value. Parameters: `a` \- an argument. `b` \- another argument. Returns: the larger of `a` and `b`. * #### max public static long max(long a, long b) Returns the greater of two `long` values. That is, the result is the argument closer to the value of[Long.MAX\_VALUE](../../java/lang/Long.html#MAX%5FVALUE). If the arguments have the same value, the result is that same value. Parameters: `a` \- an argument. `b` \- another argument. Returns: the larger of `a` and `b`. * #### max public static float max(float a, float b) Returns the greater of two `float` 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 of `a` and `b`. * #### max public static double max(double a, double b) Returns the greater of two `double` 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 of `a` and `b`. * #### min public static int min(int a, int b) Returns the smaller of two `int` values. That is, the result the argument closer to the value of[Integer.MIN\_VALUE](../../java/lang/Integer.html#MIN%5FVALUE). If the arguments have the same value, the result is that same value. Parameters: `a` \- an argument. `b` \- another argument. Returns: the smaller of `a` and `b`. * #### min public static long min(long a, long b) Returns the smaller of two `long` values. That is, the result is the argument closer to the value of[Long.MIN\_VALUE](../../java/lang/Long.html#MIN%5FVALUE). If the arguments have the same value, the result is that same value. Parameters: `a` \- an argument. `b` \- another argument. Returns: the smaller of `a` and `b`. * #### min public static float min(float a, float b) Returns the smaller of two `float` 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 of `a` and `b`. * #### min public static double min(double a, double b) Returns the smaller of two `double` 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 of `a` and `b`. * #### 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 nearest`double`. The rounding is done using the [round to nearest even rounding mode](../../java/math/RoundingMode.html#HALF%5FEVEN). In contrast, if `a * 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 that `fma(a, 1.0, c)` returns the same result as (`a + c`). However,`fma(a, b, +0.0)` does _not_ always return the same result as (`a * b`) since`fma(-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 nearest `double` 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 nearest`float`. The rounding is done using the [round to nearest even rounding mode](../../java/math/RoundingMode.html#HALF%5FEVEN). In contrast, if `a * 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 that `fma(a, 1.0f, c)` returns the same result as (`a + c`). However,`fma(a, b, +0.0f)` does _not_ always return the same result as (`a * b`) since`fma(-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 nearest `float` 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 a `double` value is the positive distance between this floating-point value and the ` double` value next larger in magnitude. Note that for non-NaN_x_, `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 is`Double.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 a `float` value is the positive distance between this floating-point value and the ` float` value next larger in magnitude. Note that for non-NaN_x_, `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 is`Float.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 a `double` value. The hyperbolic sine of _x_ is defined to be (_ex \- e\-x_)/2 where _e_ is [Euler's number](../../java/lang/Math.html#E). 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 of `x`. Since: 1.5 * #### cosh public static double cosh(double x) Returns the hyperbolic cosine of a `double` value. The hyperbolic cosine of _x_ is defined to be (_ex \+ e\-x_)/2 where _e_ is [Euler's number](../../java/lang/Math.html#E). 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 is `1.0`. 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 of `x`. Since: 1.5 * #### tanh public static double tanh(double x) Returns the hyperbolic tangent of a `double` value. The hyperbolic tangent of _x_ is defined to be (_ex \- e\-x_)/(_ex \+ e\-x_), in other words, [sinh(_x_)](../../java/lang/Math.html#sinh%28double%29)/[cosh(_x_)](../../java/lang/Math.html#cosh%28double%29). 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 of `tanh` 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 of `x`. Since: 1.5 * #### hypot public static double hypot(double x, double y) Returns sqrt(_x_2 +_y_2) 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(_x_2 +_y_2) without intermediate overflow or underflow Since: 1.5 * #### expm1 public static double expm1(double x) Returns _e_x \-1\. Note that for values of_x_ near 0, the exact sum of`expm1(x)` \+ 1 is much closer to the true result of _e_x than `exp(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 of`expm1` for any finite input must be greater than or equal to `-1.0`. Note that once the exact result of_e_`x` \- 1 is within 1/2 ulp of the limit value -1, `-1.0` should be returned. Parameters: `x` \- the exponent to raise _e_ to in the computation of_e_`x` \-1. Returns: the value _e_`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 values `x`, the result of`log1p(x)` is much closer to the true result of ln(1 + `x`) than the floating-point evaluation of`log(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 of `x` \+ 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 the [StrictMath.copySign](../../java/lang/StrictMath.html#copySign%28double,double%29) method, this method does not require NaN `sign` 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 of `magnitude` and the sign of `sign`. 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 the [StrictMath.copySign](../../java/lang/StrictMath.html#copySign%28float,float%29) method, this method does not require NaN `sign` 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 of `magnitude` and the sign of `sign`. Since: 1.6 * #### getExponent public static int getExponent(float f) Returns the unbiased exponent used in the representation of a`float`. Special cases: * If the argument is NaN or infinite, then the result is[Float.MAX\_EXPONENT](../../java/lang/Float.html#MAX%5FEXPONENT) \+ 1. * If the argument is zero or subnormal, then the result is[Float.MIN\_EXPONENT](../../java/lang/Float.html#MIN%5FEXPONENT) \-1. Parameters: `f` \- a `float` 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 a`double`. Special cases: * If the argument is NaN or infinite, then the result is[Double.MAX\_EXPONENT](../../java/lang/Double.html#MAX%5FEXPONENT) \+ 1. * If the argument is zero or subnormal, then the result is[Double.MIN\_EXPONENT](../../java/lang/Double.html#MIN%5FEXPONENT) \-1. Parameters: `d` \- a `double` 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). * If `start` is ±[Double.MIN\_VALUE](../../java/lang/Double.html#MIN%5FVALUE) and `direction` has a value such that the result should have a smaller magnitude, then a zero with the same sign as `start` is returned. * If `start` is infinite and`direction` has a value such that the result should have a smaller magnitude, [Double.MAX\_VALUE](../../java/lang/Double.html#MAX%5FVALUE) with the same sign as `start` is returned. * If `start` is equal to ±[Double.MAX\_VALUE](../../java/lang/Double.html#MAX%5FVALUE) and `direction` has a value such that the result should have a larger magnitude, an infinity with same sign as `start` is returned. Parameters: `start` \- starting floating-point value `direction` \- value indicating which of`start`'s neighbors or `start` should be returned Returns: The floating-point number adjacent to `start` in the direction of `direction`. 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 to `direction` is returned. * If `start` is ±[Float.MIN\_VALUE](../../java/lang/Float.html#MIN%5FVALUE) and `direction` has a value such that the result should have a smaller magnitude, then a zero with the same sign as `start` is returned. * If `start` is infinite and`direction` has a value such that the result should have a smaller magnitude, [Float.MAX\_VALUE](../../java/lang/Float.html#MAX%5FVALUE) with the same sign as `start` is returned. * If `start` is equal to ±[Float.MAX\_VALUE](../../java/lang/Float.html#MAX%5FVALUE) and `direction` has a value such that the result should have a larger magnitude, an infinity with same sign as `start` is returned. Parameters: `start` \- starting floating-point value `direction` \- value indicating which of`start`'s neighbors or `start` should be returned Returns: The floating-point number adjacent to `start` in the direction of `direction`. Since: 1.6 * #### nextUp public static double nextUp(double d) Returns the floating-point value adjacent to `d` in the direction of positive infinity. This method is semantically equivalent to `nextAfter(d, Double.POSITIVE_INFINITY)`; however, a `nextUp` implementation may run faster than its equivalent`nextAfter` 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 is[Double.MIN\_VALUE](../../java/lang/Double.html#MIN%5FVALUE) 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 to `f` in the direction of positive infinity. This method is semantically equivalent to `nextAfter(f, Float.POSITIVE_INFINITY)`; however, a `nextUp` implementation may run faster than its equivalent`nextAfter` 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 is[Float.MIN\_VALUE](../../java/lang/Float.html#MIN%5FVALUE) 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 to `d` in the direction of negative infinity. This method is semantically equivalent to `nextAfter(d, Double.NEGATIVE_INFINITY)`; however, a`nextDown` implementation may run faster than its equivalent `nextAfter` 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 to `f` in the direction of negative infinity. This method is semantically equivalent to `nextAfter(f, Float.NEGATIVE_INFINITY)`; however, a`nextDown` implementation may run faster than its equivalent `nextAfter` 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) Returns `d` × 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 between [Double.MIN\_EXPONENT](../../java/lang/Double.html#MIN%5FEXPONENT) and [Double.MAX\_EXPONENT](../../java/lang/Double.html#MAX%5FEXPONENT), the answer is calculated exactly. If the exponent of the result would be larger than `Double.MAX_EXPONENT`, an infinity is returned. Note that if the result is subnormal, precision may be lost; that is, when `scalb(x, n)` is subnormal, `scalb(scalb(x, n), -n)` may not equal_x_. When the result is non-NaN, the result has the same sign as `d`. 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 scale `d` Returns: `d` × 2`scaleFactor` Since: 1.6 * #### scalb public 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. See the Java Language Specification for a discussion of floating-point value sets. If the exponent of the result is between [Float.MIN\_EXPONENT](../../java/lang/Float.html#MIN%5FEXPONENT) and [Float.MAX\_EXPONENT](../../java/lang/Float.html#MAX%5FEXPONENT), the answer is calculated exactly. If the exponent of the result would be larger than `Float.MAX_EXPONENT`, an infinity is returned. Note that if the result is subnormal, precision may be lost; that is, when `scalb(x, n)` is subnormal, `scalb(scalb(x, n), -n)` may not equal_x_. When the result is non-NaN, the result has the same sign as `f`. 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 scale `f` Returns: `f` × 2`scaleFactor` Since: 1.6