Question

Right now I am trying to instantiate the Circle class (which is a subclass of Shape) in a method in my menu class. But the problem is that I keep getting a compiler error say Circle cannot be resolved to a type. In other words in does not even recognize my Circle class as an instance, it just thinks it’s another variable. I’ve tried using variables in the instantiation and I have tried using setters in the constructor.

Here is the method in the menu class where I am trying to instantiate Circle

public void select_case()
    {
        switch (menu_select)
        {
            case 1: Circle c = new Circle(1);
                    break;



        }

    } 

Just in case you need to know, menu_select is a private integer variable.

Here is the code for my Circle class. I am only going to show the constructors to make less clutter.

public class Circle extends Shape 
{
    final private pi = Java.lang.Math.PI;
    //Constructor
     Circle(double r)
     {
        super(r);
     }
}

And here is the code for the shape superclass. Like the code for the circle class only the constructors are shown.

public abstract class Shape 
{
    private static double scaleFactor;
    private double base;
    private double radius;
    private double height;
    //Constructor for circle
    public Shape(double r)
    {
        radius = r;
    }   
    //Constructor for rectangle
    public Shape(double b, double h)
    {
        base = b;
        height = h;
    }


}

Answer 1

final private pi = Java.lang.Math.PI;

should be

private final double pi = java.lang.Math.PI;

or just

private final double pi = Math.PI;

I don’t see any errors in the code other than this.