// Fig. 9.29: Circle.java
// Definition of class Circle

public class Circle extends Point {  // inherits from Point
   protected double radius;

   // no-argument constructor
   public Circle()
   {
      // implicit call to superclass constructor here
      setRadius( 0 );  
   }

   // constructor
   public Circle( double circleRadius, int xCoordinate, 
      int yCoordinate )
   {
      // call superclass constructor
      super( xCoordinate, yCoordinate );  

      setRadius( circleRadius );  
   }

   // set radius of Circle
   public void setRadius( double circleRadius )
   { 
      radius = ( circleRadius >= 0 ? circleRadius : 0 ); 
   }

   // get radius of Circle
   public double getRadius() 
   { 
      return radius; 
   }

   // calculate area of Circle
   public double area() 
   { 
      return Math.PI * radius * radius; 
   }

   // convert Circle to a String represention
   public String toString()
   { 
      return "Center = " + super.toString() + 
         "; Radius = " + radius; 
   }

   // return shape name
   public String getName()
   { 
      return "Circle"; 
   }

}  // end class Circle


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 * (C) Copyright 2002 by Deitel & Associates, Inc. and Prentice Hall.     *
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