// Fig. 9.13: Circle4.java
// Circle4 class inherits from Point3 and accesses Point3's
// private x and y via Point3's public methods.

public class Circle4 extends Point3 {

   private double radius;  // Circle4's radius

   // no-argument constructor
   public Circle4()
   {
      // implicit call to Point3 constructor occurs here
   } 
   
   // constructor
   public Circle4( int xValue, int yValue, double radiusValue )
   {
      super( xValue, yValue );  // call Point3 constructor explicitly
      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();
   } 

   // calculate and return area
   public double getArea()
   {
      return Math.PI * getRadius() * getRadius();
   } 

   // return String representation of Circle4 object
   public String toString()
   {
      return "Center = " + super.toString() + "; Radius = " + getRadius();
   } 

} // end class Circle4

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