Java atan2() method

Java Number class

atan2() method is used to convert rectangular coordinates (x, y) into polar Coordinates (r, theta), returns the resulting angle theta. This method calculates the phase angle theta by calculating the arctangent of y/x, ranging from -pi to pi.

Syntax

double atan2(double y, double x)

Parameters

• y -- Vertical coordinate.

• #x -- Abscissa.

Return value

The theta component of the polar coordinate midpoint (r, theta) corresponding to the Cartesian coordinate midpoint (x, y).

Example

public class Test{ 
	public static void main(String args[]){double x = 45.0;double y = 30.0;System.out.println( Math.atan2(x, y) );}}

Compile the above program and the output result is:

0.982793723247329

Java Number class