// Fig. 9.25: Cylinder.java
// Definition of class Cylinder.

public class Cylinder extends Circle {
   protected double height;  // height of Cylinder
   
   // no-argument constructor
   public Cylinder()      
   {
      // implicit call to superclass constructor here
      setHeight( 0 );
   }

   // constructor
   public Cylinder( double cylinderHeight,
      double cylinderRadius, int xCoordinate, 
      int yCoordinate )
   {
      // call superclass constructor
      super( cylinderRadius, xCoordinate, yCoordinate );

      setHeight( cylinderHeight );
   }

   // set height of Cylinder
   public void setHeight( double cylinderHeight )
   { 
      height = ( cylinderHeight >= 0 ? cylinderHeight : 0 ); 
   }
   
   // get height of Cylinder
   public double getHeight() 
   {
      return height; 
   }

   // calculate area of Cylinder (i.e., surface area)
   public double area()
   {
      return 2 * super.area() + 2 * Math.PI * radius * height;
   }
   
   // calculate volume of Cylinder
   public double volume() 
   { 
      return super.area() * height; 
   }

   // convert Cylinder to a String representation
   public String toString()
   {
      return super.toString() + "; Height = " + height; 
   }

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

}  // end class Cylinder

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