Predefined static methods for mathematical operations

To calculate mathematical functions on values of a numeric type, Java defines some classes containing static methods that can be used to calculate such functions. For example, the predefined class Math contains several such methods, e.g., to calculate the square root (sqrt), valore the absolute value (abs), trigonometric functions (sin, cos, tan), etc.

The following table is taken from the official documentation of the Java APIs:

Method Summary
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 an angle, in the range of 0.0 through pi.
static double	asin(double a)           Returns the arc sine of an angle, in the range of -pi/2 through pi/2.
static double	atan(double a)           Returns the arc tangent of an angle, in the range of -pi/2 through pi/2.
static double	atan2(double a, double b)           Converts rectangular coordinates (b, a) to polar (r, theta).
static double	ceil(double a)           Returns the smallest (closest to negative infinity) double value that is not less than the argument and is equal to a mathematical integer.
static double	cos(double a)           Returns the trigonometric cosine of an angle.
static double	exp(double a)           Returns the exponential number e (i.e., 2.718...) raised to the power of a double value.
static double	floor(double a)           Returns the largest (closest to positive infinity) double value that is not greater than the argument and is equal to a mathematical integer.
static double	IEEEremainder(double f1, double f2)           Computes the remainder operation on two arguments as prescribed by the IEEE 754 standard.
static double	log(double a)           Returns the natural logarithm (base e) of a double value.
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 double	pow(double a, double b)           Returns of 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 a and is equal to a mathematical integer.
static long	round(double a)           Returns the closest long to the argument.
static int	round(float a)           Returns the closest int to the argument.
static double	sin(double a)           Returns the trigonometric sine of an angle.
static double	sqrt(double a)           Returns the correctly rounded positive square root of a double value.
static double	tan(double a)           Returns the trigonometric tangent of an angle.
static double	toDegrees(double angrad)           Converts an angle measured in radians to the equivalent angle measured in degrees.
static double	toRadians(double angdeg)           Converts an angle measured in degrees to the equivalent angle measured in radians.

Example:

int j = -2;
System.out.println(Math.abs(j));    // prints 2