## Description

The abs​(double a) method of StrictMath class 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.

Notes:

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)

The abs​(double a) method of StrictMath class is static thus it should be accessed statically which means the we would be calling this method in this format:

`StrictMath.abs​(double a)`

Non static method is usually called by just declaring method_name(argument) however in this case since the method is static, it should be called by appending the class name as suffix. We will be encountering a compilation problem if we call the java compare method non statically.

## Method Syntax

public static double abs​(double a)

## Method Argument

Data Type Parameter Description
double a the argument whose absolute value is to be determined.

## Method Returns

The abs​(double a) method returns the absolute value of the argument.

## Compatibility

Requires Java 1.3 and up

## Java StrictMath abs​(double a) Example

Below is a java code demonstrates the use of abs​(double a) method of StrictMath class.

```package com.javatutorialhq.java.examples;

import java.util.Scanner;

/*
* A java example source code to demonstrate
* the use of abs​(double a) method of Math class
*/

public class StrictMathAbsDoubleExample {

public static void main(String[] args) {

System.out.print("Enter a double:");

// declare the scanner object
Scanner scan = new Scanner(System.in);

// use scanner to get the user input and store it to a variable
double dValue = scan.nextDouble();

// close the scanner object
scan.close();

// get the absolute value of the user input
double result = StrictMath.abs(dValue);

// print the result
System.out.println("result: "+result);

}

}
```

## Sample Output

Below is the sample output when you run the above example. 