Get the absolute value

static double abs(double a)

Returns the absolute value of a double value.

static float abs(float a)

Returns the absolute value of a float value.

static int abs(int a)

Returns the absolute value of an int value.

static long abs(long a)

Returns the absolute value of a long value.

public class Main {
  public static void main(String[] args) {

    System.out.print(Math.abs(-1.23));
  }
}

The output:

1.23

abs(-0.0) = +0.0, 
abs(+infinity) = +infinity, 
abs(-infinity) = +infinity, and 
abs(NaN) = NaN.

1. Math class
2. Constant E and PI
3. Get the absolute value
4. sin, cos, tan: Trigonometric functions
5. Cube root and square root
6. Ceilling and flooring value
7. Copy sign
8. Raise the power
9. Get exponent
10. sqrt(x2 +y2)
11. IEEE remainder
12. logarithm
13. Max, min value
14. Next value
15. Math Random
16. Round to int to double
17. Round a value to integer
18. value * 2^ scaleFactor
19. Get the sign
20. Degree to Radian, and Radian to Degree
21. Returns the size of an ulp of the argument