// package chapter6;

/**
 * Title:        Chapter 6, "Programming with Objects and Classes"
 * Description:  Examples for Chapter 6
 * Copyright:    Copyright (c) 2000
 * Company:      Armstrong Atlantic State University
 * @author Y. Daniel Liang
 * @version 1.0
 */

// TestCircleWithConstructors.java: Demonstrate constructors
public class TestCircleWithConstructors
{
  /**Main method*/
  public static void main(String[] args)
  {
    // Create a Circle with radius 5.0
    CircleWithConstructors myCircle =
      new CircleWithConstructors(5.0);
    System.out.println("The area of the circle of radius "
      + myCircle.radius + " is " + myCircle.findArea());

    // Create a Circle with default radius
    CircleWithConstructors yourCircle = new CircleWithConstructors();
    System.out.println("The area of the circle of radius "
      + yourCircle.radius + " is " + yourCircle.findArea());

    // Modify circle radius
    yourCircle.radius = 100;
    System.out.println("The area of the circle of radius "
      + yourCircle.radius + " is " + yourCircle.findArea());
  }
}

// Define the Circle class with two constructors
class CircleWithConstructors
{
  double radius;

  /**Default constructor*/
  CircleWithConstructors()
  {
    radius = 1.0;
  }

  /**Construct a circle with a specified radius*/
  CircleWithConstructors(double r)
  {
    radius = r;
  }

  /**Return the area of this circle*/
  double findArea()
  {
    return radius*radius*3.14159;
  }
}