StackOverflow2013

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POHow to call a non-static method from main in Java?
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copied!<p>I've been working on a lab for my Intro to Comp Sci course and I've run into this issue:</p> <p>As per the instructions, I must have every method that answer the specific question (Ex: Problem 5.9, method is fivePointNine() and must be called within main by another class (Assignment6.main). My problem here is that main is static and the final method I need to call for the lab is non-static, so it will not allow me to compile and run. The three errors I have are related to multiSphere(x). The specific error is "Cannot make a static reference to the non-static method 'multiSphere(double)' from the type Assignment6."</p> <pre><code>public class Assignment6 { public Sphere newSphere = new Sphere(); public Assignment6 A6 = new Assignment6(); public static int x; public static void main(String[] args) { x = 2 + (int)(Math.random() * ((10 - 2) + 1)); multiSphere(x); x = 2 + (int)(Math.random() * ((10 - 2) + 1)); multiSphere(x); x = 2 + (int)(Math.random() * ((10 - 2) + 1)); multiSphere(x); } public void multiSphere(double diameter) { Sphere.inputDiameter(diameter); Sphere.volumeCalc(diameter); Sphere.surfaceAreaCalc(diameter); toString(); } public String toString() { return "The diameter of this sphere is " + Sphere.inputDiameter(x) + ", the volume is " + Sphere.volumeCalc(x) + ", and the surface area is " + Sphere.surfaceAreaCalc(x) + ". "; } </code></pre> <p>My second class is called Sphere and looks like this:</p> <pre><code>public class Sphere { public Assignment6 newA6 = new Assignment6(); public static double volume; public static double surfaceArea; public static double inputDiameter(double diameter) { return diameter; } public static double volumeCalc(double diameter) { // Volume = (4.0/3.0)(pi)(r)^3 volume = (4.0/3.0) * (Math.PI) * Math.pow((diameter/2.0), 3); return volume; } public static double surfaceAreaCalc(double diameter) { // Surface area = (4)(pi)(r)^2 surfaceArea = (4) * (Math.PI) * (Math.pow((diameter/2.0), 2)); return surfaceArea; } } </code></pre> <p>I'm not exactly sure how to call the multiSphere(x) in the main method without running into the errors I've been getting. I feel like I'm missing something so simple. </p>

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