Tester Class Constructor Error

Question

This is the homework question I have to answer: Implement a class

SodaCan

whose constructor receives the height and diameter or the soda can. Supply methods

getVolume

and

getSurfaceArea

. Supply a

SodaCanTester

class that tests your class.

This is the code I have for the

SodaCan

class.

public class SodaCan

{

    private double Height;

    private double Radius;



    public SodaCan(double h, double d) {

        Height = h;

        Radius = d/2;

    }



    public double getVolume()

    {

        return Math.PI * Height * Math.pow(Radius, 2);

    }



    public double getSurfaceArea()

    {

        return (2 * Math.PI * Radius * Height) + 

        (2 * Math.PI * Math.pow(Radius, 2));

    }   

}

This is the code I have for the

SodaCanTester

class.

public class SodaCanTester

{

    public static void main(String[] args)

    {

       SodaCan cylinder = new SodaCan();

       cylinder.enterHeight(5);

       cylinder.enterRadius(8);

       System.out.println("Volume: " + getVolume());

       System.out.println("Expected Volume: 1005.31");

       System.out.println("Surface Area: " + getSurfaceArea());

       System.out.println("Expected Surface Area: 653.45");

    }

}

When I try to compile the tester class, I get an error with the constructor:

SodaCan cylinder = new SodaCan();

That says:

"constructor SodaCan in class SodaCan cannot be applied to given types".

What am I doing wrong, and how can I fix this?

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Answer 1

Because, you have have args constructor in your class SodaCan

public SodaCan(double h, double d) {
    Height = h;
    Radius = d/2;
}

You need to explicitly declare no-arg constructor, if you want to make the below code work

SodaCan cylinder = new SodaCan();

Edited==

Your code should look like this

public SodaCan(double h, double d) {
    Height = h;
    Radius = d/2;
}

public SodaCan(){}

Tester Class Constructor Error

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