Question

Although this class can be compiled and run as part of a program, objects of this class may not work properly. Why?

class Circle {

    private double radius, area;

    public Circle(double radius, double area) {

        setRadius(radius);

        this.area = area;

    }

    public double setRadius(double r) { radius = r; }

    public double getArea() { return area; }

}

(a) The class should be public.

(b) The constructor is not allowed to call the setRadius method.

(c) In the setRadius method, we must use the “this” keyword.

(d) The radius can become “stale.”

Answer 1

ANSWER: Here option(B) is correct because setRadius () method is incorrect it should be void method because it has to set the radius and you should use this keyword but not must be.Below snaps have one error after that I correct it.

CODE with Errors:

CODE WITHOUT ERRORS: