logarithm

Return	Method	Summary
static double	log(double a)	Returns the natural logarithm (base e) of a double value.
static double	log10(double a)	Returns the base 10 logarithm of a double value.
static double	log1p(double x)	Returns the natural logarithm of the sum of the argument and 1.


public class Main {
  public static void main(String[] args) throws Exception {
    System.out.println(Math.log(2));
  }

}

The output:


0.6931471805599453

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