The Math class contains all the floating-point functions that are used for geometry and trigonometry, as well as several general-purpose methods.

**Math**

The **Math** class contains all the floating-point functions that are used
for geometry and trigonometry, as well as several general-purpose methods. **Math** defines two **double** constants: **E**
(approximately 2.72) and **PI**
(approximately 3.14).

**Trigonometric
Functions**

The following methods accept
a **double** parameter for an angle in
radians and return the result of their respective trigonometric function:

Method : Description

static double sin(double arg) : Returns the
sine of the angle specified by arg in radians.

static double cos(double arg) : Returns the
cosine of the angle specified by arg in radians.

static double tan(double arg) : Returns the
tangent of the angle specified by arg in radians.

The next methods take as a parameter the result
of a trigonometric function and return, in radians, the angle that would
produce that result. They are the inverse of their non-arc companions.

Method : Description

static double asin(double arg) : Returns the
angle whose sine is specified by arg.

static double acos(double arg) : Returns the
angle whose cosine is specified by arg.

static double atan(double arg) : Returns the
angle whose tangent is specified by arg.

static double atan2(double x, double y) :
Returns the angle whose tangent is x/y.

The next methods compute the hyperbolic sine,
cosine, and tangent of an angle:

Method : Description

static double sinh(double arg) : Returns the
hyperbolic sine of the angle specified by arg.

static double cosh(double arg) : Returns the
hyperbolic cosine of the angle specified by arg.

static double tanh(double arg) : Returns the
hyperbolic tangent of the angle specified by arg.

**Exponential
Functions**

**Math **defines the following exponential methods:

**Rounding
Functions**

The **Math** class defines several methods that provide various types of
rounding operations. They are shown in Table 17-16. Notice the two **ulp( )** methods at the end of the table.
In this context, *ulp* stands for *units in the last place*. It indicates
the distance between a value and the next higher value. It can be used to help
assess the accuracy of a result.

**Miscellaneous
Math Methods**

In addition to the methods
just shown, **Math** defines several
other methods, which are shown in Table 17-17. Notice that several of the
methods use the suffix **Exact**. These
were added by JDK 8. They throw an **ArithmeticException**
if overflow occurs. Thus, these methods give you an easy way to watch various
operations for overflow.

The following program
demonstrates **toRadians( )** and **toDegrees( )**:

// Demonstrate toDegrees() and toRadians().

class Angles {

public static void main(String args[]) { double
theta = 120.0;

System.out.println(theta + " degrees is
" + Math.toRadians(theta) + " radians.");

theta = 1.312;

System.out.println(theta + " radians is
" + Math.toDegrees(theta) + " degrees.");

}

}

The output is shown here:

120.0 degrees is 2.0943951023931953 radians.

1.312 radians is 75.17206272116401 degrees.

**StrictMath**

The **StrictMath** class defines a complete set of mathematical methods that parallel those in **Math**. The difference is that the **StrictMath** version is guaranteed to generate precisely identical results across all Java implementations, whereas the methods in **Math** are given more latitude in order to improve performance.

**Compiler**

The **Compiler** class supports the creation of Java environments in which Java bytecode is compiled into executable code rather than interpreted. It is not for normal programming use.

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail

Java The Complete Reference : The Java Library : Exploring java.lang : Math - java.lang |

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