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);

	}

}

Sample Output

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

Suggested Reading List

References