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Java - Math.abs() method example

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Palusbug

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The Math.abs() function returns the absolute value of a number.

The absolute value of the number x denoted |x|, is the non-negative value of x without regard to its sign.

Popular usage examples:

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public class MathExample {
​
    public static void main(String[] args) {
        System.out.println( Math.abs(2)     ); // 2
        System.out.println( Math.abs(-2)    ); // 2
​
        System.out.println( Math.abs(2.54)  ); // 2.54
        System.out.println( Math.abs(-2.54) ); // 2.54
​
        System.out.println( Math.abs(0)     ); // 0
        System.out.println( Math.abs(3 + 5) ); // 8
        System.out.println( Math.abs(3 - 5) ); // 2
    }
}

1. Documentation

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Syntax	xxxxxxxxxx 1 package java.lang; 2 3 public final class Math { 4 5 public static int abs(int number) { ... } 6 public static long abs(long number) { ... } 7 public static float abs(float number) { ... } 8 public static double abs(double number) { ... } 9 10 } Note: Classes in the `java.lang` package are imported automatically, so it is not necessary to do it manually - we use just `Math.abs()` call.
Parameters	`number` - `double`, `float`, `int`, or `long` value (primitive value).
Result	The absolute value calculated from the `number` (primitive value).
Description	`Math.abs()` is a static method that takes only one parameter and returns absolute number parameter value. The absolute value of the number x denoted \|x\|, is the non-negative value of x without regard to its sign.

2. Math.abs() custom implementation

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public class CustomMath {
​
    static double abs(double x) {
        if (x < 0) {
            return -x;
        }
        return x;
    }
​
    public static void main(String[] args) {
        System.out.println( abs(2.0) ); // 2.0
        System.out.println( abs(-2.0)); // 2.0
        System.out.println( abs(0.0) ); // 0.0
    }
}