**java.lang.StrictMath** abs(double a)

## 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) { // Ask user input (double) 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); } }