// Fig. 10.8: Circle.java
// Circle class inherits from Point.

public class Circle extends Point {
   private double radius;  // Circle's radius

   // no-argument constructor; radius defaults to 0.0
   public Circle()
   {
      // implicit call to Point constructor occurs here
   } 
   
   // constructor
   public Circle( int x, int y, double radiusValue )
   {
      super( x, y );  // call Point constructor
      setRadius( radiusValue );
   } 

   // set radius
   public void setRadius( double radiusValue )
   {
      radius = ( radiusValue < 0.0 ? 0.0 : radiusValue );
   } 

   // return radius
   public double getRadius()
   {
      return radius;
   } 

   // calculate and return diameter
   public double getDiameter()
   {
      return 2 * getRadius();
   } 

   // calculate and return circumference
   public double getCircumference()
   {
      return Math.PI * getDiameter();
   } 

   // override abstract method getArea to return Circle area
   public double getArea()
   {
      return Math.PI * getRadius() * getRadius();
   } 

   // override abstract method getName to return "Circle"
   public String getName()
   {
      return "Circle";
   } 

   // override toString to return String representation of Circle
   public String toString()
   {
      return "Center = " + super.toString() + "; Radius = " + getRadius();
   } 

} // end class Circle

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