Everything You Need To Know About Java Math abs()

This article will introduce you to Java Math Abs() method, and in the process tell you how to generate absolute value of an argument. Following pointers will be covered in this article,

• Java Math abs()
• Examples of abs()

• • int
  • double
  • float
  • long

Lets begin!!

Java Math abs()

• As we cannot have all the logarithmic and trigonometric tables hard coded in our applications or data, Java provides Math – a very useful class for this purpose.
• Math is final class of java.lang with static methods for performing the operations like exponential, logarithm, roots and trigonometric equations
• The two most fundamental elements in Math are the ‘e’ and ‘pi’. These two constants are often required in the above calculations/operations
• ‘e’ (base of the natural logarithm) and ‘pi’ (ratio of the circumference of a circle to its diameter) are provided as double fields with following values
• Math.E – 2.718281828459045
• Math.PI – 3.141592653589793
• abs() method is used to calculate absolute(positive) value of the argument, where arguments can be int, long , double and float

following are the overloaded abs methods from Math class –

• public static int abs(int a)
• public static double abs(double b)
• public static float abs(float c)
• public static long abs(long d)

a, b c or d can be negative values, whereas returns will be positive value, but if argument is Integer.MIN_VALUE or Long.MIN_VALUE, the most negative representable int value or long value, the result is that same value, that is negative value. Above methods can take infinity and NaN as argument and return the same respectively

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Examples of abs() –

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int

public class Example1{
public static void main(String args[]){
int a = 56;
int b = -47;
//printing absolute value of int and Integer.MIN_VALUE
System.out.println(Math.abs(a));
System.out.println(Math.abs(b));
System.out.println(Math.abs(Integer.MIN_VALUE));
}
}

Output –
56
47
-2147483648

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double –

public class Example2
{
public static void main(String args[])
{
double x = -27.64;
double y = -394.27;
//printing absolute value of double type
System.out.println(Math.abs(x));
System.out.println(Math.abs(y));
System.out.println(Math.abs(7.0 / 0)); //infinity
}
}

Output –
27.64
394.27
Infinity

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float-

public class Example3
{
public static void main(String args[])
{
float x = -63.02f;
float y = -438.0f;
//printing absolute value of float type
System.out.println(Math.abs(x));
System.out.println(Math.abs(y));
}
}

Output –
63.02
438.0

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long-

public class Example4
{
public static void main(String args[])
{
long x = 78730363;
long y = -4839233;
//printing absolute value of long type
System.out.println(Math.abs(x));
System.out.println(Math.abs(y));
System.out.println(Math.abs(Long.MIN_VALUE));
}
}

Output –
78730363
4839233
-9223372036854775808

Now after executing the above program you would have understood the Java Math abs() Method. Thus we have come to an end of this article. If you wish to learn more, check out the Java Training by Edureka, a trusted online learning company. Edureka’s Java J2EE and SOA training and certification course is designed to train you for both core and advanced Java concepts along with various Java frameworks like Hibernate & Spring.

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