Circle.java w/o special methods

//Class
public class Circle{

   //Instance Variables - Variable attributes or characteristics
   private double radius;

   //Methods - Abilities: What can your objects do?
   public void setRadius( double rad ){
      radius = rad;
   }

   public double getRadius(){
      return radius;
   }

   //Add any other methods here
   public double area(){
      return Math.PI * Math.pow(radius,2);
   }

   public double diameter(){
      return 2 * radius;
   }

   public double circumference(){
      return Math.PI * diameter();
   }

}