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Java - Math.abs() Examples

Java Java API 

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Class:

java.lang.Math

java.lang.Objectjava.lang.Objectjava.lang.Mathjava.lang.MathLogicBig

Methods:

public static int abs(int a)

Returns the absolute value of an int value.

Note that if the argument is equal to the value of Integer.MIN_VALUE, the most negative representable int value, the result is that same value, which is negative.


public static long abs(long a)

Returns the absolute value of a long value.

Note that if the argument is equal to the value of Long.MIN_VALUE, the most negative representable long value, the result is that same value, which is negative.


public static float abs(float a)

Returns the absolute value of a float value. 


public static double abs(double a)

Returns the absolute value of a double value.


Examples


package com.logicbig.example.math;

public class AbsExample {
    public static void main(String... args) {
        double d = -1.5;
        System.out.println("Before: " + d);
        double result = Math.abs(d);
        System.out.println("After: " + result);
    }
}

Output

Before: -1.5
After: 1.5




package com.logicbig.example.math;

public class AbsExample2 {

    public static void main(String... args) {
        float f;
        f = -1.5f;
        System.out.println("Before: " + f);
        float result = Math.abs(f);
        System.out.println("After: " + result);
    }
}

Output

Before: -1.5
After: 1.5




package com.logicbig.example.math;

public class AbsExample3 {

    public static void main(String... args) {
        int e = -5;
        System.out.println("Before: " + e);
        int result = Math.abs(e);
        System.out.println("After: " + result);
    }
}

Output

Before: -5
After: 5




package com.logicbig.example.math;

public class AbsExample4 {

    public static void main(String... args) {
        long g = -543521;
        System.out.println("Before: " + g);
        long result = Math.abs(g);
        System.out.println("After: " + result);
    }
}

Output

Before: -543521
After: 543521

abs() can be useful when we want to find the positive difference of two values.

package com.logicbig.example.math;

public class AbsExample5 {

    public static void main(String... args) {
        showDifference(-3, 7);
        System.out.println("--------------");
        showDifference(-7, -3);
        System.out.println("--------------");
        showDifference(3, 7);
    }

    public static void showDifference(int a, int b) {
        int diff = a - b;
        System.out.printf("Without abs, Diff of %s and %s is %s%n", a, b, diff);
        diff = Math.abs(diff);
        System.out.printf("With abs, Diff of %s and %s is %s%n", a, b, diff);
    }
}

Output

Without abs, Diff of -3 and 7 is -10
With abs, Diff of -3 and 7 is 10
--------------
Without abs, Diff of -7 and -3 is -4
With abs, Diff of -7 and -3 is 4
--------------
Without abs, Diff of 3 and 7 is -4
With abs, Diff of 3 and 7 is 4

See Also