# class Math Java

March 17, 2011 | java.lang

Introduction The java.lang.Math class includes many methods with which many simple arithmetic operations can be done like finding the square root, rounding, trigonometric and logarithm functions. As these methods are defined as static, they can be used directly by the programmer without the trouble of creating an object. Following is the class signature as defined in the java.lang package.

public final class Math extends Object

As the class is final, it cannot be extended (like String class, you know earlier). The Math class includes only two constants as defined hereunder.

**public static final double E = 2.7182818284590452354; (Base of natural logarithms)

public static final double PI = 3.14159265358979323846; (ratio of circumference to the diameter of a circle)**

###### Following table gives some important static methods of "class Math Java" and their purpose.

Method

Legal Parameters

What For

abs(x)

int, long, float, double

Gives the absolute value of x

acos(x)

double

Gives the arccosine of x

exp(x)

double

Gives the exponential value to the power of x

ceil(x)

double

Gives the minimum value but greater than x

floor(x)

double

Gives the maximum value but less than x

log(x)

double

Gives the natural log value of x

max(x,y)

int, long, float, double

Gives the maximum of x and y

min(x,y)

int, long, float, double

Gives the minimum of x and y

pow(x,y)

double

Gives a value x raised to y

random()

---

Gives a random number between 0.0 to 1.0

rint(x)

double

Gives a double value nearer to x

round(x)

float, double

Gives the nearer integer to x

sqrt(x)

double

Gives the square root of x

Note: Also available asin(x), atan(x), sin(x), cos(x) and tan(x) etc. The parameter of trigonometric functions is in radians.

The next program uses some methods of Math class.

``````public class MathMethods
{
public static void main(String args[])
{
System.out.println("PI value: " + Math.PI);
// abs() method gives a positive value
System.out.println("Math.abs(-4.7): " + Math.abs(-4.7));
System.out.println("Math.abs(4.7): " + Math.abs(4.7));
// rounds to a nearest higher value
System.out.println("Math.ceil(4.7): " + Math.ceil(4.7));
System.out.println("Math.ceil(2.1): " + Math.ceil(2.1));
System.out.println("Math.ceil(-2.1): " + Math.ceil(-2.1));

System.out.println("Math.floor(2.9): " + Math.floor(2.9));
System.out.println("Math.floor(-2.9): " + Math.floor(-2.9));
// rounds as we do in maths; >= 0.5 rounds to higher value else to the lower
System.out.println("Math.round(2.7): " + Math.round(2.7));
System.out.println("Math.round(2.3): " + Math.round(2.3));
System.out.println("Math.round(-2.8): " + Math.round(-2.8));
// gives maximum of the two
System.out.println("Math.max(3, 6.4): " + Math.max(3, 6.4));
// gives minimum of the two
System.out.println("Math.min(3.2, 6.4): " + Math.min(3.2, 6.4));
// gives the power value, first value raised by second value
System.out.println("Math.pow(3, 4): " + Math.pow(3, 4));
// gives a rondom number
System.out.println("Math.random(): " + Math.random());
// returns the square root
System.out.println("Math.sqrt(24.87): " + Math.sqrt(24.87));
// gives trigonometric value (parameter in radians)
System.out.println("Math.sin(40): " + Math.sin(40));
System.out.println("Math.cos(40): " + Math.cos(40));
System.out.println("Math.tan(40): " + Math.tan(40));
}
}`````` Output screenshot on class Math Java

random() method generates random number. For more on random number generation refer java.util package.