//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
 */

// Circle.java: The circle class that extends GeometricObject
public class Circle extends GeometricObject
{
  private double radius;

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

  /**Construct circle with a specified radius*/
  public Circle(double rad)
  {
    this(rad, "white", false);
  }

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

  /**Return radius*/
  public double getRadius()
  {
    return radius;
  }

  /**Set a new radius*/
  public void setRadius(double rad)
  {
    radius = rad;
  }

  /**Implement the findArea method defined in GeometricObject*/
  public double findArea()
  {
    return radius*radius*Math.PI;
  }

  /**Implement the findPerimeter method defined in GeometricObject*/
  public double findPerimeter()
  {
    return 2*radius*Math.PI;
  }

  /**Override the equals() method defined in the Object class*/
  public boolean equals(Circle circle)
  {
    return this.radius == circle.getRadius();
  }

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