Programiz
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Java Math atan2()
class Main { public static void main(String[] args) { // two coordinates x and y double x = 3.7; double y = 6.45; // get angle θ double theta = Math.atan2(y, x); System.out.println(theta); // 1.0499821573815171 // convert into the degree System.out.println(Math.toDegrees(theta)); // 60.15954618200191 } }
Tutorialspoint
tutorialspoint.com › java › lang › math_atan2.htm
Java - Math atan2(double, double) Method
Following is the declaration for java.lang.Math.atan2() method ... This method returns the theta component of the point (r, theta) in polar coordinates that corresponds to the point (x, y) in Cartesian coordinates. ... The following example shows the usage of Math atan2() method with both ...
Videos
Tutorialspoint
tutorialspoint.com › home › java › java atan2 method
Java atan2 Method
March 29, 2021 - Java Vs. C++ ... The method converts rectangular coordinates (x, y) to polar coordinate (r, theta) and returns theta. ... X − X co-ordinate in double data type. Y − Y co-ordinate in double data type.
W3Schools
w3schools.com › java › ref_math_atan2.asp
Java Math atan2() Method
Note: In the atan2() method the y coordinate goes first, then the x coordinate. This is because it is doing the division y / x. ... If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail: sales@w3schools.com · If you want to report an error, or if you want to make a suggestion, send us an e-mail: help@w3schools.com · HTML Tutorial CSS Tutorial JavaScript Tutorial How To Tutorial SQL Tutorial Python Tutorial W3.CSS Tutorial Bootstrap Tutorial PHP Tutorial Java Tutorial C++ Tutorial jQuery Tutorial
Tutorial Gateway
tutorialgateway.org › java-atan2-function
Java atan2 Function
November 22, 2024 - The Math.atan2 Function in this Programming returns the angle (in radius) from the X-Axis to the specified point (y, x). In this Java program, We find the same with positive and negative values and display the output.
GeeksforGeeks
geeksforgeeks.org › java › java-lang-math-atan2-java
java.lang.Math.atan2() in Java - GeeksforGeeks
June 20, 2021 - Example: Program demonstrating the atan2() method ... // Java program for implementation of // atan2() method import java.util.*; class GFG { // Driver Code public static void main(String args[]) { // X and Y coordinates double x = 90.0; double y = 15.0; // theta value from polar coordinate (r, theta) double theta = Math.atan2(y, x); System.out.println(theta); } }
Tutorialspoint
tutorialspoint.com › java › lang › number_atan2.htm
Java - Math.atan2() Method
The Java Math atan2(double y,double x) converts rectangular coordinates (x, y) to polar (r, theta). This method computes the phase theta by computing an arc tangent of y/x in the range of -pi to pi.
DEV Community
dev.to › satyam_gupta_0d1ff2152dcc › master-java-atan2-your-guide-to-angles-not-just-math-1n2o
Master Java atan2(): Your Guide to Angles, Not Just Math - DEV Community
November 28, 2025 - The Verdict: atan2() is more robust, more accurate, and saves you from writing a bunch of messy if-else statements to check quadrants. It just works. Getting Your Hands Dirty: Code Examples Enough theory.
GitHub
raw.githubusercontent.com › Wulfcastle › JavaDox › master › number_atan2.htm
Java - atan2() Method
Java atan2() Method - Learning Java in simple and easy steps : A beginner's tutorial containing complete knowledge of Java Syntax Object Oriented Language, Methods, Overriding, Inheritance, Polymorphism, Interfaces, Packages, Collections, Networking, Multithreading, Generics, Multimedia, Serialization, GUI.
Vultr Docs
docs.vultr.com › java › standard-library › java › lang › Math › atan2
Java Math atan2() - Calculate Arc Tangent | Vultr Docs
July 9, 2025 - In this article, you will learn how to utilize the atan2() method in various scenario.
Educative
educative.io › answers › how-to-use-math-atan2double-y-double-x-in-java
How to use Math atan2(double y, double x) in Java
May 5, 2018 - The atan2() function in Java accepts two argument values, x and y.
Top answer 1 of 3
13
Math.java it define as
public static double atan2(double y, double x) {
return StrictMath.atan2(y, x); // default impl. delegates to StrictMath
}
and this will return the counter-clock wise angle with respect to X- axis.
If you interchange those two you will get the clock wise angle with respect to X- axis.
In Cartesian coordinate system we consider counter-clock wise angle with respect to X-axis. That is why Math.java use this as above.
2 of 3
2
Swapping the order of the arguments means that instead of the (counter-clockwise) angle with the X-axis you get the (clockwise) angle with the Y-axis. It's not wrong, just unusual.
Codecademy
codecademy.com › docs › java › math methods › .atan2()
Java | Math Methods | .atan2() | Codecademy
March 25, 2025 - Use Math.atan2() to return the angle of point (0.0, 1.0) and the x-axis: ... Learn more about how to get involved. Edit this page on GitHub to fix an error or make an improvement.
Cach3
tutorialspoint.com.cach3.com › java › number_atan2.htm
Java atan2() Method - Tutorials Point - Cach3
November 6, 2024 - public class Test { public static void main(String args[]) { double x = 45.0; double y = 30.0; System.out.println( Math.atan2(x, y) ); } } This will produce the following result − · 0.982793723247329 · Previous Page · Print · Next Page · java_numbers.htm ·
Wikitechy
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java tutorial - Java Math.atan2() Мethod - By Microsoft Award MVP - java tutorial - java programming - learn java - java basics - java for beginners - Learn in 30sec | wikitechy
Method Math.atan2 () - It converts rectangular coordinates (x, y)in to polar coordinates (r, theta) and then returns theta. ... X is the x coordinate in the double data type. Y is the y coordinate in the double data type. In Java, Math.atan2 () returns a theta from the polar coordinates (r, theta).
GeeksforGeeks
geeksforgeeks.org › strictmath-atan2-method-in-java
StrictMath atan2() Method in Java | GeeksforGeeks
December 13, 2021 - Java 8 Tutorial · Java Multithreading ...ath.atan2() is an inbuilt method in java which is used to calculate arc tangent of ordinate_val/abscissa_val in the range between -pi and pi....
AlphaCodingSkills
alphacodingskills.com › java › note › java-math-atan2.php
Java Math atan2() Method - AlphaCodingSkills
public class MyClass { public static void main(String[] args) { System.out.println(Math.atan2(10, 10)); System.out.println(Math.atan2(20, 10)); System.out.println(Math.atan2(-20, 10)); } } ... AlphaCodingSkills is a online learning portal that provides tutorials on Python, Java, C++, C, C#, PHP, R, Ruby, Rust, Scala, Swift, Perl, SQL, Data Structures and Algorithms.
Dirask
dirask.com › posts › Java-Math-atan2-method-example-1RvQ81
Java - Math.atan2() method example
public class CustomMath { static double calculateAngle(double y, double x) { double angle = Math.atan2(y, x); if (angle < 0.0) { angle += 2.0 * Math.PI; } return (180 / Math.PI) * angle; // rad to deg conversion } public static void main(String[] args) { // y x degrees System.out.println( calculateAngle( 2, 4) ); // 26.56505117707799 System.out.println( calculateAngle( 4, -2) ); // 116.56505117707799 System.out.println( calculateAngle(-2, -4) ); // 206.565051177078 System.out.println( calculateAngle(-4, 2) ); // 296.565051177078 } }
Reddit
reddit.com › r/learnjava › how does math.atan2 work?
r/learnjava on Reddit: How does Math.atan2 work?
June 20, 2021 -
I've been calculating rotation needed between two 3d points, and I'm having some slight trouble.
You can use very basic sohcahtoa to find the angle needed between the two points by making a right triangle and just doing arctan of opposite/adjacent (the two sides). Now this only works if all of the values are positive, as, for example, arctan(-5/-4) == arctan(5/4). I do remember learning something about fixing this back when I learned about trig identities in school, and how to fix it, but my friend sent me some code, and he used Math.atan2 instead of tangent.
Now his code works perfectly, and was not too different from mine, and it really made me wonder what Math.atan2 does. I searched up on the internet, and didn't understand a word of the descriptions. Can someone show me what Math.atan2 is in normal math writing?
Top answer 1 of 2
2
if I understood right this method returns result in radians. Like angle of 0 degrees is 0, angle of 180 is 3,14... This supposed to help you to convert coordinates from cartesian system (x, y) to polar coordinates (radius, angle) it can be really helpful in some cases. So that for point (0, 90) polar representation is like (90, 1.57) For some reason atan2 method gets arguments in reversed manner. Y then X.
2 of 2
1
Check the Wikipedia page for all the normal math writing you could want. The problem with atan is its range -90 to 90 degrees (-pi/2 to pi/2 radians), which causes duplication > 90 degrees and < 270 degrees, which you have to correct for using sign checks on the input arguments (adding or subtracting pi from the result). Also, since atan takes a single argument (the ratio y / x), it doesn't work at 90 degrees/270 degrees (x is zero), so you have to check the x value to determine if the angle is -pi/2 or pi/2. As you can see from the Wikipedia article, atan2 is defined in terms of atan, takes the y and x values, and does all the checks for you.