Java Math.abs() Method

Java Math.abs() method returns an absolute value of the given number. In this tutorial, we will discuss abs() method with examples.

public class JavaExample
{
  public static void main(String args[])
  {
    int i = -10;
    float f = -5f;
    System.out.println(Math.abs(i));
    System.out.println(Math.abs(f));
  }
}

Output:

10
5.0

Syntax of abs() Method

Math.abs(-15.5); //returns 15.5

abs() Description

public static int abs(int num): It returns the absolute value of the passed integer value num. There are other variations of this method in Java Math class. These variations are:

public static int abs(int num); //for integers
public static long abs(long num); //for long numbers
public static float abs(float num); //for float point
public static double abs(double num); //for double num

abs() Parameters

It takes a single parameter:

• num: An int, float, long or double value whose absolute values is to be determined.

abs() Return Values

• If the passed argument is a negative number, the positive number is returned.
• If the passed argument is a positive number, same is returned.
• If argument is infinite, positive infinity returned.
• If the argument is NaN (Not a Number) then NaN is retuned.

Example 1: Absolute value of int, long, float and double

public class JavaExample
{
  public static void main(String args[])
  {
    int i = -10;
    float f = 5f; //already positive, same returned
    double d = -12.55;
    long l = 101L; //same returned
    System.out.println(Math.abs(i));
    System.out.println(Math.abs(f));
    System.out.println(Math.abs(l));
    System.out.println(Math.abs(d));
  }
}

Output:

Example 2: Absolute value of infinity and NaN

public class JavaExample
{
  public static void main(String args[])
  {
    //number divided by zero infinity
    System.out.println(Math.abs(5.0/0));

    //zero divided by zero is NaN (Not a Number)
    System.out.println(Math.abs(0.0/0.0));
  }
}

Output:

Example 3: Absolute value of Integer.MIN_VALUE and Long.MIN_VALUE

public class JavaExample
{
  public static void main(String args[])
  {
    //lowest possible negative int value is returned
    System.out.println(Math.abs(Integer.MIN_VALUE));

    //lowest possible negative long value is returned
    System.out.println(Math.abs(Long.MIN_VALUE));
  }
}

Output: