// Fig. 9.6: Circle.java
// Circle class contains x-y coordinate pair and radius.

public class Circle {
   private int x;          // x-coordinate of Circle's center
   private int y;          // y-coordinate of Circle's center
   private double radius;  // Circle's radius

   // no-argument constructor
   public Circle()
   {
      // implicit call to Object constructor occurs here
   } 

   // constructor
   public Circle( int xValue, int yValue, double radiusValue )
   {
      // implicit call to Object constructor occurs here
      x = xValue;  // no need for validation
      y = yValue;  // no need for validation
      setRadius( radiusValue );
   } 

   // set x in coordinate pair
   public void setX( int xValue )
   {
      x = xValue;  // no need for validation
   } 

   // return x from coordinate pair
   public int getX()
   {
      return x;
   } 

   // set y in coordinate pair
   public void setY( int yValue )
   {
      y = yValue;  // no need for validation
   } 

   // return y from coordinate pair
   public int getY()
   {
      return y;
   } 

   // 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 * radius;
   } 

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

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

   // return String representation of Circle object
   public String toString()
   {
      return "Center = [" + x + ", " + y + "]; Radius = " + radius;
   } 

} // end class Circle

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