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Thread: Help me I am trying to get this code to work.

  1. #1
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    Default Help me I am trying to get this code to work.

    Here is what my compiler is telling me: GeometryCalculator.java:20: error: constructor Sphere in class Sphere cannot be applied to given types;
    Sphere sp = new Sphere(r);
    ^
    required: no arguments
    found: double
    reason: actual and formal argument lists differ in length


    import java.util.Scanner;
     
    /**
       This is a test driver for the Sphere, Cylinder, and Cone class
       This approach is more object-oriented than the previous one because
       it clearly separates the duties of each class.
    */
    public class GeometryCalculator
    {
       public static void main(String[] args)
       {
          Scanner in = new Scanner(System.in);
     
          System.out.println("Please enter the radius: ");
          double r = in.nextDouble();
     
          System.out.println("Please enter the height: ");
          double h = in.nextDouble();
     
          Sphere sp = new Sphere(r);
          double v = sp.getVolume();
          double s = sp.getSurfaceArea();
     
          System.out.println("The volume of the sphere is: " + v);
          System.out.println("The surface area of the sphere is: " + s);
     
          Cylinder cy = new Cylinder(r, h);
          v = cy.getVolume();
          s = cy.getSurfaceArea();
     
          System.out.println("The volume of the cylinder is: " + v);
          System.out.println("The surface area of the cylinder is: " + s);
     
          Cone co = new Cone(r, h);
          v = co.getVolume();
          s = co.getSurfaceArea();
     
          System.out.println("The volume of the cone is: " + v);
          System.out.println("The surface area of the cone is: " + s);
       }
    }



    /**
       This class provides methods to compute the volume and surface area of a sphere.
       @author:
       @version:
    */
    public class Sphere
    {
     
       /**
          Constructs a Sphere object with input: radius.
          @param aRadius the radius
       */
    	 Sphereobject sphere = new Sphereobject();
     
     
     
     
       /**
          Computes the volume of a sphere.
          @return volume of sphere
        */
    	 public static double  Computevolume(double r){
     
    	 double Volume = 4/3*Math.PI*r * Math.pow(r,2);
     
    	 return Volume;
    }
     
       /**
          Computes the surface area of a sphere.
          @return surface area of a sphere
        */
     
    	public static double computeSurfaceArea(double r){
     
       double SurfaceArea = 4*Math.PI* Math.pow(r,2);
     
    	return SurfaceArea;
     
     
    	}
    		private double r;
    }


    public class Sphereobject
    {
    public static void main(String[] args)
    {
     
     
    	Sphere Sphere1 = new Sphere ();
    	}
    	}


    --- Update ---

    I left some comments so it would be easier to understand what I had to do but now I am completely confused as to what I have to do to fix this.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Help me I am trying to get this code to work.

    Sphere sp = new Sphere(r);
    ^
    required: no arguments
    found: double
    reason: actual and formal argument lists differ in length
    The compiler can not find a constructor for the Sphere class that takes a double.
    Either remove the double arg (r) passed to the constructor
    or add a constructor to the Sphere class that takes a double as arg
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Help me I am trying to get this code to work.

    How would I do the latter? just put in (double r)?

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Help me I am trying to get this code to work.

    Take a look at the tutorial: Providing Constructors for Your Classes (The Java™ Tutorials > Learning the Java Language > Classes and Objects)
    If you don't understand my answer, don't ignore it, ask a question.

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