//package chapter8;

/**
 * Title:        Chapter 8, "Class Inheritance and Interfaces"
 * Description:  Examples for Chapter 8
 * Copyright:    Copyright (c) 2000
 * Company:      Armstrong Atlantic State University
 * @author Y. Daniel Liang
 * @version 1.0
 */

// Cylinder.java: The new cylinder class that extends the circle
// class
public class Cylinder extends Circle
{
  private double length;

  /**Default constructor*/
  public Cylinder()
  {
    this(1.0, 1.0);
  }

  /**Construct a cylinder with specified radius, and length*/
  public Cylinder(double rad, double len)
  {
    this(rad, "white", false, len);
  }

  /**Construct a cylinder with specified radius, filled, color, and
     length
   */
  public Cylinder(double rad,
    String c, boolean fill, double len)
  {
    super(rad, c, fill);
    length = len;
  }

  /**Return length*/
  public double getLength()
  {
    return length;
  }

  /**Set a new length*/
  public void setLength(double len)
  {
    length = len;
  }

  /**Return the surface area of this cylinder*/
  public double findArea()
  {
    return 2*super.findArea()+(2*getRadius()*Math.PI)*length;
  }

  /**Return the volume of this cylinder*/
  public double findVolume()
  {
    return super.findArea()*length;
  }

  /**Override the equals method defined in the Object class*/
  public boolean equals(Cylinder cylinder)
  {
    return (this.getRadius() == cylinder.getRadius()) &&
      (this.length == cylinder.getLength());
  }

  /**Override the toString method defined in the Object class*/
  public String toString()
  {
    return "[Cylinder] radius = " + getRadius() + " and length "
      + length;
  }
}